Catalog AC Motors DR.71 315, DT56, DR63, 19290411 BE11 G07

User Manual: BE11

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Drive selection
Electrical characteristics

Drive selection

6.1

Electrical characteristics

6.1.1

Suitability for operating with an inverter
DR.. series AC motors and AC brakemotors can be operated on inverters thanks to
the high quality windings and insulation material with which they are equipped as
standard. Please also refer to the "Drive selection – controlled motor (→ 2 179)".

6.1.2

Frequency
SEW‑EURODRIVE AC motors are designed for a line frequency of 50 Hz or 60 Hz on
request. The technical data in this motor catalog is based on a line frequency of 50 Hz
as standard.
A corresponding design is available for DRS.. and DRE.. motors that can be operated
on both a 50 Hz and 60 Hz grid: the global motor. This allows different regional electrical regulations to be complied with in a single motor. In particular, it brings together
the different national regulations on minimum efficiency levels. See the "The global
motor" (→ 2 45) chapter.

6.1.3

Motor voltage
AC motors in the standard and energy efficient design are available for rated voltages
of 220 - 725 V.

2-, 4-, 6-pole DRS.., DRE.., DRP.. motors
The 2-, 4- or 6-pole motors with power ratings up to 5.5 kW are usually delivered in
the following voltage designs:
•

for voltage range 220 – 242 V m / 380 – 420 V W , 50 Hz
or

•

for nominal voltage 230 V m / 400 V W , 50 Hz.

These voltage ranges are available up to the following power ratings / motor sizes:
•

75 kW in energy efficiency classes IE1 and IE2 in size 280S

•

75 kW in energy efficiency class IE3 in size 280M

The 2-, 4- or 6-pole motors with power ratings up to 7.5 kW are usually delivered in
the following voltage designs:
•

for voltage range 380 – 420 V m / 690 – 725 V W, 50 Hz
or

•

for nominal voltage 400 V m / 690 V W , 50 Hz.

These voltage ranges are available up to the following power rating / motor size:
0.18 kW in size 71S

19290411/EN – 10/2014

•

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Electrical characteristics

The other optional motor voltages available as standard are listed in the following table.
Motors
Standard
High
Premium

IE1
IE2
IE3

Standard
High
Premium

IE1
IE2
IE3

Standard
High
Premium

IE1
IE2
IE3

Voltage
range

Nominal
voltage

Motor sizes up to 5.5 kW
Motor sizes from 7.5 kW
2-pole motors
DRS71S2 – 132S2
DRS132M2 – 132MC2
DRE80M2 – 132M2
DRE132MC2
DRP80M2 – 132M2
4-pole motors
DRS71S4 – 132S4
DRS132M4 – 280S4
DRS280M4 – 315L4
DRE80S4 – 132M4
DRE132MC4 – 280S4
DRE280M4 – 315L4
DRP90M4 – 160S4
DRP160MC4 – 280M4
DRP315K4 – 315L4
6-pole motors
DRS71S6 – 160S6
DRS160M6
DRE71M6 – 160M6
DRP90L6 – 160M6
AC 220 – 242 / 380 –
420 V

m/W

AC 380 – 420 / 690 – 725 V

m/W

AC 230 / 400V

m/W

AC 290 / 500 V

m/W

AC 400 / 690 V

m/W

AC 500 / -

The table with the brake voltages is located in the "Brake voltage" (→ 2 126) chapter.
Motors and brakes for AC 230 / 400 V and motors for AC 690 V may also be operated
on supply systems with a rated voltage of AC 220 / 380 V or AC 660 V respectively.
The voltage-dependent data will change slightly.
The technical data for motor size DR.250 – DR.315 only refers to a rated voltage of
400 / 690 V. Please consult SEW‑EURODRIVE for other voltages.
4/2- and 8/4-pole DRS.. motors with Dahlander windings
Multi-speed AC motors with Dahlander windings are available for nominal voltages of
220 V – 720 V.
They are generally available in the following voltage types for a power rating of up to
5.5 kW in one of the two pole numbers:
•

Nominal voltage 400 V m / WW, 50 Hz

Dahlander winding motors with a power rating over 5.5 kW in one of the two pole numbers are generally available with star topology capacity at low speed in the following
voltage types:
Nominal voltage 400 V m- W/WW , 50 Hz
19290411/EN – 10/2014

•

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Electrical characteristics

The other motor voltages available as standard are listed in the following table.
Motor sizes
up to 5.5 kW
4/2-pole motors
DRS71S4/2 –
132M4/2
8/4-pole motors
DRS71S8/4 –
DRS112M8/4 –
100L8/4
132M8/4

Standard

Standard
Nominal
voltage
(AC)

m /WW
m- W/WW

over 5.5 kW
DRS160S4/2 –
180L4/2

6
DRS160S8/4 –
225M8/4

400 V
-

400 V

If not specified in the order, the motors are designed for a nominal voltage of 50 Hz in
the above-mentioned voltages.
8/2-pole DRS.. motors with separate windings
Multi-speed AC motors with separate windings are available for nominal voltages of
220 V – 690 V.
The following connection and voltage types are the only ones available for all motor
sizes:
•

Nominal voltage 400 V W / W, 50 Hz

If not specified in the order, the motors are designed for a nominal voltage of 50 Hz in
the above-mentioned voltage.
12-pole DRM.. torque motors
DRM.. torque motors are only available in nominal voltage.
All sizes up to 346 V m / 600 V W, 50 Hz can be constructed in the S1 design, besides the DRM71S12. The S1 limit voltage for the DRM71S12 is 277 V m / 480 V W in
the 50 Hz grid. The smallest design voltage amounts to 88 V m / 153 V W, 50 Hz for
all S1-DRM.. sizes.
All sizes up to 346 V m / 600 V W, 50 Hz can be constructed in the S3 / 15% design.
The smallest design voltage amounts to 153 V m / 266 V W, 50 Hz for all S3 / 15%
DRM.. sizes.
The standard voltage for the torque motors is 230 / 400 V, 50 Hz.
If not specified in the order, the S1 or S3 / 15% torque motors are designed for a nominal voltage of 50 Hz in the above-mentioned voltage.

19290411/EN – 10/2014

The torque motor values for operation on the 60 Hz grid are available separately.
Please contact SEW‑EURODRIVE in this case.

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Electrical characteristics

6.1.4

Voltage for the global motors
The global motors are available in three voltage blocks in the standard ≤ 0.55 kW design as motor type DRS.. and in the energy saving design ≥ 0.75 kW as motor type
DRE.., please refer to the "The global motor" (→ 2 45) chapter. The design as a voltage range cannot be changed and nominal voltage data cannot be provided.
The 2-, 4- and 6-pole DRS.. and DRE.. motors with power ratings of up to 5.5 kW are
available in the following variants as standard:
•

voltage range 220 – 242 V m / 380 – 420 V W, 50 Hz
voltage range of 254 – 277 V m / 440 – 480 V W, 60 Hz

This voltage range version is available up to the following power rating / motor size:
•

45 kW in energy efficiency class IE2 size DRE225M4

The 2-, 4- and 6-pole DRE.. motors with power ratings of over 7.5 kW are available in
the following variants as standard:
•

voltage range 380 – 420 V m / 690 – 725 V W, 50 Hz
voltage range of 440 – 480 V m, 60 Hz

This voltage range version is available up to the following power rating / motor size:
•

0.18 kW in size DRS71S

The other motor voltages available as standard are listed in the following table.
Motor sizes

Standard
High Efficiency

IE1
IE2

Standard
High Efficiency

IE1
IE2

Standard
High Efficiency

IE1
IE2

up to 5.5 kW
from 7.5 kW
2-pole motors
DRS71S2
DRE80M2 – 132M2
DRE132MC2
4-pole motors
DRS71S4 – 71M4
DRE80M4 – 132M4
DRE132MC4 – 250M4
6-pole motors
DRS71S6
DRE71M6 – 160M6
-

50 Hz

220 – 242 V / 380 – 420 V

60 Hz

254 – 277 V / 440 – 480 V

50 Hz

380 – 420 V / 690 – 725 V

60 Hz

440 – 480 V / -

Voltage range (AC)
Voltage range (AC)
75 and 90 kW
DRE280S and 280M

Voltage at 50 Hz

Voltage at 60 Hz

380 – 420 V / 660 – 725 V

460 V

If not specified in the order, the global motors are delivered for the combined 50 Hz /
60 Hz voltage range in the standard designs mentioned above.
The DRE315 motor size is not available in the combined 50 Hz and 60 Hz global motor voltage range. The 50 Hz voltage range is possible, please refer to the "Motor voltage" (→ 2 121) chapter.
6.1.5

Forced cooling fan voltage
The forced cooling fan for the DR.. motor series can either be delivered in two threephase current-AC voltage ranges or in a DC voltage design.

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19290411/EN – 10/2014

Energy efficiency class

Drive selection
Electrical characteristics

The three-phase current-AC voltage designs are also able to operate in the 50 Hz as
well as the 60 Hz grid and up to three versions can be operated by switching the connection type.
The capacitor required for the AC voltage operation in a Steinmetz circuit is included
in the delivery by SEW-EURODRIVE and is located in the forced cooling fan's wiring
space.
The following table shows the possible voltage designs.
Forced cooling fan

DC 24 V
50 Hz

AC 120 V

60 Hz

50 Hz

60 Hz

6
DR.200 –
315

+/-

1 × 24 V

m with capacitor

1 × 100 – 127 V

3 × 100 – 127 V

3 × 175 – 220 V

m with capacitor

1 × 100 – 135 V

3 × 100 – 135 V

3 × 175 – 230 V

m with capacitor

1 × 230 – 277 V

3 × 200 – 290 V

3 × 346 – 500 V

m with capacitor

1 × 200 – 277 V

3 × 220 – 330 V

3 × 380 – 575 V

19290411/EN – 10/2014

AC 230 V

Motor sizes
DR.71 – 132
DR.160 –
180

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Electrical characteristics

6.1.6

Brake voltage
The BE brake is available in voltage designs of AC 120 V – 575 V and DC 24 V / AC
60 V.
The standard brake voltage design is
•

nominal voltage AC 230 V: DR.71 BE05 – DR.132 BE11
and

•

nominal voltage AC 400 V: DR.160 BE11 – DR.315 BE122

If not specified in the order, the brakes are delivered for the above mentioned voltages
as standard.
The following rules also apply:
•

The brake voltage is also confirmed as a voltage range for motors that are designed in the voltage range.

•

The brake voltage is also indicated as a nominal voltage for motors with a confirmed nominal voltage.

The other optional motor voltages available as standard for the brake voltage of BE
brakes are listed in the following table.
Design

Voltage range

Nominal voltage

Motor sizes and brake sizes
DR.71 – 132
DR.160 – 180 DR.180 – 315
BE05 – BE11
BE11 – BE20
BE30 – 122
AC

220 – 242 V

380 – 420 V

230 V

400 V

24 V

An extended voltage range applies for the supply voltage of brakes for the global motors:
Design

Voltage range

Motor sizes and brake sizes
DR.71 – 132
DR.160 – 180
DR.180 – 225
BE05 – BE11
BE11 - BE20
BE30 – 32
AC

220 – 277 V

380 – 480 V

19290411/EN – 10/2014

The permanent operation of the brake on the global motor with a connection voltage
above AC 254 V or AC 440 V is only permitted with the simultaneous operation of the
global motor, as otherwise the brake ventilation cannot be guaranteed.

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Electrical characteristics

6.1.7

Standard 50 Hz connections
The standard motor connections are defined depending on the number of poles. The
following table provides an overview as well as the theoretical synchronous speed on
the 50 Hz grid based on the number of poles.
Number of poles

Connection

Synchronous speed nsyn on the 50
Hz grid

2-pole

m /W

3000

4-pole

m /W

1500

6-pole

m /W

1000

12-pole

4/2-pole

8/4-pole

m /W

0 (500)

m 1) / W
m /WW

1500 / 3000

W-m /WW
m /WW

750 / 1500

W-m /WW
W /W

8/2-pole

750 / 3000

1) Torque motors with tapped winding in the delta connection to limit the torque to a maximum of 3 times
the value of the star connection are available on request.

6.1.8

50 Hz motors on 60 Hz grids
The rated data of motors designed for 50 Hz grids differ as follows when the motors
are operated on 60 Hz supply systems:
Motor voltage
at 50 Hz

Connection

AC 230 m / 400 V W

AC 230 m/ 400 V W

AC 400 m/ 690 V W

Voltage
Modified rated data
at 60 Hz Speed Power
torque
Starting
limit
torque
230

+20 %

460

+20 % +20 %

-17 %

19290411/EN – 10/2014

If you want to operate motors designed for 50 Hz supply systems on a 60 Hz grid,
please consult SEW‑EURODRIVE. Some countries and regions provide regulations
for the efficiency of motors for 50 Hz grids, even though only 60 Hz grids are available.

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Electrical characteristics

6.1.9

60 Hz motors
This motor catalog contains technical information on motors for grids with a frequency
of 50 Hz.
The motors are also available for grids with a frequency of 60 Hz. The standard and
energy-efficient designs are implemented in precisely the same manner.
Regional regulations, such as NEMA MG1 (USA), CSA C22.2 (Canada) or ABNT
(Brazil) and others are complied with.
The power assignment differs between the 60 Hz and 50 Hz motors for some sizes.

19290411/EN – 10/2014

Power ratings with a local market significance and which are outside of the IEC series
are taken into account. Example: a motor with 3.7 kW / 5 hp is included as well as a
4.5 kW / 6 hp motor.

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Thermal characteristics

6.2

Thermal characteristics

6.2.1

Thermal classes pursuant to IEC / EN60034-1 and IEC 62114
In addition to motor standard IEC / EN 60034-1, the IEC 62114 also describes the
thermal class designs and identifications. They define the limit overtemperature based
on a maximum ambient temperature of +40 °C and a reserve of 10 K or 15 K for potential voltage tolerances.
A number identification is required. The addition of a long-standing letter in brackets is
permitted. SEW-EURODRIVE identifies the motors using a combination of numbers
and letters.
Thermal class SEW identification

Limit overtemperature in K (permitted heating at the rated torque)

130

130 (B)

80 K

155

155 (F)

105 K

180

180 (H)

125 K

The various motor measurements result in different basic thermal class designs.
Motor design
DRS.. (one speed)
DRS.. (two speed)

Basic thermal class design
130 (B)
with copper rotor 155 (F)
Dahlander winding 130 (B), occasionally 155 (F)
separate winding 130 (B)

DRE.. and DRP..

130 (B)

DRL..

155 (F)

DRM..

155 (F)

The DRS.., DRE.. and DRP.. motors can also be built and delivered in higher thermal
classes 155 (F) and 180 (H). In some cases, mounted options require a higher basic
thermal class design.
DRL.. servomotors and DRM.. torque motors are not available in thermal class 180
(H), as the entire motor would then reach prohibited temperatures in the gaskets, ball
bearings and bearing lubricants. The reasons for this decision are as follows:

19290411/EN – 10/2014

6.2.2

•

the non-ventilated rated operation at a standstill for the DRM.. torque motors

•

the constant ventilation of the fan-cooled DRL.. servomotors in inverter mode.

Power reduction
The rated power PN of a motor depends on the ambient temperature and the altitude.
The rated power stated on the nameplate applies for an ambient temperature of 40 °C
and a maximum installation altitude of 1,000 m above sea level. The rated power must
be reduced according to the following formula in the case of higher ambient temperatures or altitudes:
PNred = PN × fT × fH
The following diagrams show the power reduction depending on the ambient temperature and installation altitude.

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The factors fT and fH apply for the motors:
fT

1.0

1.0
0.9

0.9
0.8

0.8

0.7
0.6

0.7

0.5
30

T [°C]

1000

2000

3000

4000

5000 H [m]

9007207957178763

T = ambient temperature
H= Installation altitude above sea level

19290411/EN – 10/2014

Please contact SEW-EURODRIVE for ambient temperatures above 60 °C and installation altitudes over 5000 m.

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Thermal characteristics

6.2.3

Operating modes
Motor standard IEC / EN 60034-1: 2011-02 defines the following operating modes,
among other things.
Designation
of the operating mode
S1

Text explanation

Continuous duty: Operation with a constant load.

Operation at a constant load, with a duration long enough for the
machine to reach a steady thermal condition.
S2

Short-time duty: Operation with a constant load and idling time.
Operation at a constant load for a time which is less than the time
required for reaching a steady thermal condition. The subsequent
standstill time when the windings are de-energized is long enough
for the motor temperature to deviate less than 2K from the temperature of the cooling agent. S2 is supplemented by the operating time
in minutes.

Periodic intermittent duty: without affecting the starting procedure.
This duty is a sequence of identical duty cycles, with each cycle including a period of operation at constant load and a standstill period
with de-energized windings. The starting current does not have any
significant effect on the temperature rise. S3 is supplemented by the
relative cyclic duration factor in %.

Periodic cycle: continuous periodic operation.
This duty is a sequence of identical cycles, with each cycle including
a period of operation at constant load and a period of idle time.
There is no standstill period in which the windings are de-energized.
S6 is supplemented by the relative time under load in %.

Non-periodic cycle: non-periodic load and speed changes.
Operation with usually non-periodic changes in load and speed within the permitted operating range. In this cycle, overloads often occur
that significantly exceed the reference load.
A constant load in line with duty type S1 is selected as the reference
value for the overload for this duty type.

INFORMATION

19290411/EN – 10/2014

S1 continuous duty is normally assumed when operating the motor on an inverter. In
the case of a high number of cycles per hour, it might be necessary to assume S9
intermittent duty.

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Thermal characteristics

The following figure shows duty types S1, S2 and S3.

3980471563

Determining the relative CDF
The cyclic duration factor (CDF) is the ratio between the period of loading and the duration of the duty cycle. The cycle duration is the sum of the switch-on times and the
de-energized rest periods. A typical value for the cycle duration is ten minutes.
cdf =

Total number of times of operation (t1 + t2 + t3)
• 100 [%]
Cycle duration (T)

19290411/EN – 10/2014

3980474251

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Thermal characteristics

Power increasing factor K
Unless specified otherwise and indicated on the nameplate, the rated power of the
motor refers to duty type S1 (100 % cdf) pursuant to IEC / EN 60034. If a motor designed for S1 and 100 % cdf is operated in mode S2 "short-time duty" or S3 "intermittent duty", the rated power can be multiplied by the power increasing factor "K" specified on the nameplate and the motor can be loaded beyond the rated points accordingly.
Duty type
S2

S4 –
S10

Power increasing
factor K

Operating time

Relative cyclic duration factor (cdf)

60 min

1.1

30 min

1.2

10 min

1.4

75 %

1.1

40 %

1.15

25 %

1.3

15 %

1.4

The following information must be specified to determine the rated power and the duty type: number and
type of cycles per hour, run-up time, time at load,
braking type, braking time, idle time, cycle duration,
period at rest and power demand.

On request

In the case of high counter-torques and high mass moments of inertia (heavy starting),
please contact SEW‑EURODRIVE with exact information about the technical data
when changing the duty type.
6.2.4

Thermal monitoring
In accordance with the standard, two fundamental states are taken into account when
monitoring a motor against thermal overload.

Thermal overload with gradual change
If a motor is exposed to a thermal overload with a gradual rise in temperature, the
thermal protection system must prevent a rise in the winding temperature over the following values.
Thermal classification

Maximum winding temperature

130 (B)

145 °C

155 (F)

170 °C

180 (H)

195 °C

19290411/EN – 10/2014

Possible causes could be:
•

Failure of the cooling or the cooling system due to excessive dust in the cooling
ducts or the cooling fins on the motor housing.

•

Reduction in the air volume due to the partial covering of the fan grille.

•

Renewed drawing in of heated cooling air.

•

An excessive rise in the ambient temperature or the coolant temperature.

•

Gradually rising mechanical overload.

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•

Voltage drop, overvoltage or asymmetry in the motor supply over an extended period.

•

Excessive operating time for a motor rated for intermittent duty.

•

Frequency deviations.

Thermal overload with rapid change
If a motor is exposed to a thermal overload with a rapid rise in temperature, the thermal protection system must prevent a rise in the winding temperature over the following values.
Thermal classification

Maximum winding temperature

130 (B)

225 °C

155 (F)

240 °C

180 (H)

260 °C

Possible causes could be:
Motor blockage.

•

Phase failure.

•

Start-up under abnormal conditions, e.g. with excess mass moment of inertia, insufficient voltage or abnormally high load torque.

•

Sudden and marked rise in the load.

•

Repeated start-up within a short space of time.

19290411/EN – 10/2014

•

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Thermal characteristics

Determining the right motor protection
Selecting the correct protection device is a significant factor in determining the operational reliability of the motor. We distinguish between protection devices that are current-dependent and those that depend on the motor temperature.
Current-dependent protection devices that are generally operated from the control
cabinet, include:
•

Fuses
or

•

Motor overload circuit breakers.

Temperature-dependent protection devices in the winding are
•

PTC thermistors (thermistor sensors)
or

•

Bimetallic switches (thermostats).

PTC thermistors or bimetallic switches respond when the maximum permitted winding
temperature is reached. The advantage is that temperatures are recorded where they
actually occur.
Fuses

Fuses do not protect the motor from overload. They are exclusively used as
short-circuit protection and may detect a motor blockage, as this condition is
similar to a short-circuit on the terminals.

Motor overload circuit
breaker

Motor circuit breakers offer adequate protection against overload in standard
operation with a low starting frequency, brief start-ups and starting currents that
are not excessive. The motor circuit breaker is set to the rated motor current.
Motor protection switches are not adequate as the sole means of protection given switching operation with a high starting frequency (> 60 / h) and for heavy
starting. In these cases we recommend to use a positive temperature coefficient
thermistor TF in addition.

PTC thermistor

Three positive temperature coefficient (PTC) thermistors TF (PTC, characteristic
curve according to DIN 44080) are connected in series in the motor and connected from the terminal box to an inverter input or to a trip switch in the control
cabinet.
Motor protection with positive temperature coefficient (PTC) thermistors (SEW
designation /TF) provide comprehensive protection against thermal overload.
Motors protected in this way can be used for high inertia starting, switching and
braking operation as well as with fluctuating power supplies. A motor circuit
breaker is usually installed in addition to the TF. SEW‑EURODRIVE recommends using motors equipped with TF for inverter operation.

19290411/EN – 10/2014

Bimetallic switch

Three bimetallic switches (SEW designation /TH), connected in series in the
motor, are integrated directly into the motor monitoring circuit from the terminal
box. Due to the size and the insulation required for the motor winding, the TH
does not reach the reaction speed of the PTC thermistor.
The switching hysteresis may not permit a motor switching frequency depending on the design.

MOVIMOT® protection
devices

MOVIMOT® drives contain integrated protection devices to prevent thermal
damage. No other external devices are required for motor protection.

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Thermal characteristics

Comparison of the safety mechanisms
The following tables show the qualification of the various protection devices for different causes of tripping.
Key:
Scope of protection

Icon

Comprehensive protection

Limited protection

•

No protection

Reason for the additional thermal load

Current-dependent protection device
Fuse
Motor overload
circuit breaker

Temperature-dependent protection device
PTC thermis- /TH bimetallic
tor
switch
/TF

Over-currents up to 200 % IN

Heavy start

•

Direct switching of the direction of
rotation

•

Switching operation up to Z = 30
1/h

•

Stalling

•

Phase failure

•

Voltage deviation
(greater than tolerance B)
Frequency deviation
(greater than tolerance B)

19290411/EN – 10/2014

Insufficient motor cooling

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Starting frequency

6.3

Starting frequency
A motor is usually rated according to its thermal loading. In many applications the motor is started only once (S1 = continuous running duty = 100 % cyclic duration factor).
The power demand calculated from the load torque of the driven machine is the same
as the rated motor power.

6.3.1

High starting frequency
Many applications call for a high starting frequency at low counter-torque, such as for
a travel drive. In this case, it is not the power demand that is the decisive factor in determining the size of the motor, but rather the number of times the motor has to start
up. Frequent starting means the high starting current flows every time, leading to disproportionate heating of the motor.
The windings become overheated if the heat absorbed is greater than the heat dissipated by the motor ventilation system. The thermal load capacity of the motor can be
increased by selecting a suitable thermal classification or by means of forced cooling
(see the "Thermal characteristics" (→ 2 129) chapter).

6.3.2

No-load starting frequency Z0
SEW‑EURODRIVE specifies the permitted starting frequency of a motor as the noload starting frequency Z0 at 50 % cyclic duration factor. This value indicates the number of times per hour that the motor can accelerate the mass moment of inertia of its
rotor up to speed without counter-torque at 50 % cyclic duration factor.

19290411/EN – 10/2014

If an additional mass moment of inertia of a load has to be accelerated or if an additional load torque occurs, the run-up time of the motor will increase. Increased current
flows during this run-up time. This means the motor is subjected to increased thermal
load and the permitted starting frequency is reduced.

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Starting frequency

6.3.3

Permitted starting frequency of the motor
The permitted starting frequency Z of a motor in cycles/hour can be calculated using
the following formula:
Z = Z0 × KJ × KM × KP
You can determine the factors KJ, KM and KP using the following diagrams:
Depending on the addition- Depending on the counteral moment of inertia
torque at startup

Depending on the static
power and the cyclic duration factor (cdf)

3980481035

JX =

Total of all external mass moments of inertia in relation to the
motor axis

JZ =

Mass moment of inertia flywheel
fan

MH = Acceleration torque motor

Pstat = Power requirement after
start-up (static power)

JM = Mass moment of inertia of the
motor

PN = Rated motor power

ML = Counter-torque during startup

%cdf = cyclic duration factor

Example
Brakemotor: DRS71M4 BE1
No-load starting frequency Z0 = 11000 1/h
1. (JX + JZ) / JM = 3.5 : KJ = 0.2
2. ML / MH = 0.6 : KM = 0.4
3. Pstat / PN = 0.6 and 60 % cdf : KP = 0.65
Z = Z0 × KJ × KM × KP = 11000 1/h × 0.2 × 0.4 × 0.65 = 572 1/h
The cycle duration amounts to 6.3 s.

6.3.4

Permitted work done by the brake
If you are using a brakemotor, you have to check whether the brake is approved for
use with the required duty type. Please also refer to the information in the "Permitted
braking work of the BE brake during working brake actions (→ 2 376)" or the "Permitted braking work of the BE brake in case of an emergency stop (→ 2 385)" chapters.

138

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

The switch-on time amounts to 3.8 s.

Drive selection
Mechanical designs

6.4

Mechanical designs

6.4.1

Degrees of protection pursuant to EN /IEC 60034-5

Designs
AC motors and AC brakemotors are available with degree of protection IP54 as standard. Degrees of protection IP55, IP56, IP65 or IP66 are available upon request.
IP
Touch guard

1. digit
Protection against foreign objects

2. digit
Protection against water

No protection

Protected against access to hazardous parts with the back of
your hand

Protection against solid foreign
objects Ø 50 mm and larger

Protected against dripping water

Protected against access to hazardous parts with a finger

Protection against solid foreign
objects Ø 12 mm and larger

Protection against dripping water when tilted up to 15°

Protected against access to hazardous parts with a tool

Protection against solid foreign
objects Ø 2.5 mm and larger

Protected against spraying water

Protected against solid foreign
objects Ø 1 mm and larger

Protected against splashing water

Dust-proof

Protection against water jets

Dust-proof

Protection against powerful water jets

4
5

Protected against access to hazardous parts with a wire

6
7

Protection against temporary immersion in water

Protection against permanent
immersion in water

In addition to the protection classification using the above code, further identification
with more information may be required pursuant to the standard.
SEW-EURODRIVE uses the additional designation with the letter "W" to identify internal corrosion protection.
Example:

19290411/EN – 10/2014

6.4.2

•

IP55: Dust- and water jet-resistant

•

IP55W: Corrosion- Dust- and water jet-resistant

Vibration class
The motors comply with vibration class A. If special requirements for the mechanical
running smoothness exist, 2-, 4-, or 6-pole motors without add-ons (no brake, forced
cooling fan, encoder, etc.) can be delivered in a low-vibration design in vibration class
B.
For vibration classes A or B, the motor rotors are always dynamically balanced with a
half key.

Catalog – AC Motors DR.71 - 315, DT56, DR63

139

Drive selection
Mechanical designs

6.4.3

Vibration stress
The normal motor setup requires a vibration-free attachment and duty type. Make sure
that the supports are even, the foot or flange mounting is correct and if there is direct
coupling, align with precision. Resonances between the rotational frequency and the
double network frequency caused by the structure are to be avoided.
Only install the (gear)motor in the mounting position specified on the nameplate on a
level, vibration-free and torsionally rigid support structure. Align the (gear)motor and
the driven machine carefully in order to prevent the output shaft from being exposed to
unacceptable strain. Pay attention to the permitted overhung and axial loads and
avoid impacts on the shaft end when applying transmission elements. We recommend
heating the elements prior to assembly.
If all of these requirements cannot be ensured in the application, the motors can be
delivered in a design for vibration stress.
Vibration level 1 (VL1) ensures that the motors are able to deal with an external influence. The values in the following table are based on standardized information pursuant to DIN ISO 10816-1.

Motor size

Periodic vibrations

Shock stress
1g = 9.81 m/s²

DR.71 – DR.132

Effective vibration speed ≤ 4.5 mm/s

Maximum acceleration = 10 g

DR.160 – DR.315

Effective vibration speed ≤ 7.1 mm/s

Maximum acceleration = 15 g

If you require a drive in line with VL1, or if the required values exceed the information
for VL1, please contact SE-EURODRIVE.
The following design types and options are not available for vibration stress:
Term

Designation

Brake monitoring

/DUB

Built-in encoder

/EI7.

Air filter

/LF

Forced cooling fan
®

MOVIMOT

MOVI‑SWITCH

/V
/MM

/FI

19290411/EN – 10/2014

Foot-mounted motors DR.71 – DR.132

/MSW

140

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Mechanical designs

6.4.4

Vibration monitoring
External influences can gradually lead to the failure of important motor functions, such
as defects in the bearings. In particular, for motors with higher power ratings, the investments can be maintained by preventive maintenance and inspection. Vibration
monitoring supports the timely detection of the need for maintenance.
SEW-EURODRIVE provides a mounting adapter for vibration recorders and tapped
holes for SPM measuring nipples.
Tapped holes to mount the measuring nipple can be applied on the A- and B-side in
the flanges and covers of motor sizes DR.160 – 315.

[1]

2706206475

The SEW-EURODRIVE delivery components may include:
•

only the bores

•

the bores and the mounted measuring nipple.

Please contact SEW‑EURODRIVE if required.
6.4.5

Shaft ends
The A-side shaft ends of the foot- and/or flange-mounted motor design are usually delivered with a keyway pursuant to DIN 6885 Sheet 1 (ISO 773). The shaft ends can
also be delivered smooth and without a key and keyway on request.

19290411/EN – 10/2014

Motors are balanced with a half key as standard, please also refer to the "Vibration
class" (→ 2 139) chapter.
In particular, when replacing older motors, there may be a need to balance the motors
with a full key in order to continue using the existing transmission and connecting elements, such as couplings.
The full-key balancing must be specified in the order if required. SEW-EURODRIVE
identifies motor rotors balanced in this manner with a "V" on the front shaft end face in
line with the standard regulations.
Whether balanced with a full- or half-key, the motors are always delivered with full
keys, which are secured against loss during transport.

Catalog – AC Motors DR.71 - 315, DT56, DR63

141

Drive selection
Mechanical designs

The special form of the A-side shaft end for direct mounting to the SEW gear units is
the pinion shaft end. A standardized diameter is provided depending on the number of
poles, power and motor size. Smaller dimensions must be precisely inspected with the
application data. Larger pinion shaft ends limit the potential reduction ratio variations,
but are required in rare cases due to the high dynamic loads.
6.4.6

Integral motors
If the motor or gear unit is replaced for a SEW-EURODRIVE gearmotor, the following
needs to be observed:
To ensure an oil-tight reassembly, SEW-EURODRIVE recommends using the sealant
included in the delivery.
Both the gear unit housing and the motor flange are made from aluminum as well as
gray cast iron. This must be noted during assembly.

6.4.7

Flange-mounted motors
The flange-mounted motors in the DR.. modular motor system are available in three
different specifications.
•

Flange-mounted design with metric through bore, also referred to as B5 motors in
the standard for the basic design.

•

Flange-mounted design with metric thread, also referred to as B14 motors in the
standard for the basic design.

•

Flange-mounted design with inch thread, also referred to as C-Face in the US
standard for the basic design.

The regulations for the metric flange dimensions are provided in IEC 72-1, while the
dimensions for inch flanges are provided in MENA MG1.
Flange-mounted motor in

possible sizes

IM B5 design

DR.71 – DR.315

IM B14 design

DR.71 – DR.100

C-Face design

DR.71 – DR.80

All motor flanges pursuant to standard IEC 72-1, also generally referred to as IEC motors, are produced from gray cast iron (GG20).
If the dimensions of the metric flange are also designed for the respective motor power in the size in line with EN 50347, this is indicated as follows in the catalog designation:
•

For B5 motors, with /FF.

•

For B14 motors, with /FT.

•

For flanges that deviate from EN, with /FL.

The parallel design as a flange- and foot-mounted design is possible for flanges with
metric measurements. These combinations have their own type and catalog designations.

142

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

The inch flanges pursuant to C-Face are identified with /FC in the SEW catalog designation.

Drive selection
Mechanical designs

6.4.8

Foot-mounted motors
The foot-mounted motor design follows a range of construction principles:
•

Aluminum bed plates for sizes DR.71 – DR.132.

•

Two single gray cast iron feet for sizes DR.160 – DR.315.

As standard, the only parts of the motor that are treated are the sides and surfaces to
which the bed plate/feet are connected. A retroactive modification to attach the bed
plate/feet to another side of the motor is generally not possible without great expense.

If the required position of the bed plate/feet is not in place when ordering, all sides of
the motor can be machined to attach the bed plate/feet at the factory for DR.71 – 132
and DR.250/280 motors. This means that the customer can freely select the position
of the bed plate/feet.
When ordering the DR.250/280, it is possible to specify if the feet should be delivered
unattached or attached. SEW-EURODRIVE identifies this decision by attaching the
letter A or B to the selected foot-mounted design.
Example:
Designation Type

Explanation

/FE

A position machined, feet attached

/FEA

Foot- and flange-mounted design

/FEB

6.4.9

Three positions machined, feet delivered
unattached
Three positions machined, feet attached to
a position

Oil seals
The motors are constructed as flange-mounted motors, gearmotors or integral motors
with oil seals. In the standard designs, nitrite butadiene rubber (NBR) oil seals are
used.
Fluorocarbon rubber (FKM) oil seals can also be used up to a lower temperature limit
of -25 °C.
The following motors are constructed using fluorocarbon rubber (FKM) oil seals in the
series design up to a minimum temperature of -20 °C.
•

2-pole motors

•

4-pole motors

19290411/EN – 10/2014

For gearmotors, the lubricant also influences the oil seal.

Catalog – AC Motors DR.71 - 315, DT56, DR63

143

Drive selection
Mounting positions

6.5

Mounting positions
The motor standard IEC 60034-7 only recognizes mounting positions that are rotated
or tilted within a 90° grid, please also refer to the "Motor design designation" (→ 2 89)
chapter.

6.5.1

Inclined mounting positions
In most cases, the defined and established positions in line with the standard are sufficient. The standard does not recognize inclined mounting positions.
The motors are also available for inclined mounting positions if the initial design, target
design and the angle are specified. There is a restriction for two position specifications. Further rotation towards a third position is not possible.
Example: IM B3 → IM V5: with an angle of 40°
SEW-EURODRIVE confirms the permissibility of the inclined mounting position by providing the following information on the nameplate and the order confirmation in line
with the data specified by the customer:
B3/V5/40°
The mounting position-dependent designs on the motor side are identified, defined
and attached depending on this information, e.g. the condensation drain holes.
If a gearmotor is delivered for an inclined mounting position, the lubricant quantities
and the placement of the oil fittings are adapted accordingly.
Any application that deviates from the specification may only be performed in coordination with SEW-EURODRIVE.

6.5.2

Moving mounting position
Depending on the application, it may be necessary for the DR. motor to cyclically
and/or permanently switch between two mounting positions. This situation is also not
described in the standard.
The motors are also available for moving mounting positions if the initial design, target
design and the angle are specified. There is a restriction for two position specifications. A further switching movement towards a third position is not possible.
Example: IM B3 → IM V5: with a starting angle of 10°, with an end angle of 80°
SEW-EURODRIVE confirms the permissibility of the moving mounting position by providing the following information on the nameplate and the order confirmation in line
with the data specified by the customer:
B3/V5/10-80°
The mounting position-dependent designs on the motor side are identified, defined
and attached in multiple position, if necessary, depending on this information, e.g. the
condensation drain holes.

Any application that deviates from the specification may only be performed in coordination with SEW-EURODRIVE.
Please also contact SEW-EURODRIVE for moving mounting positions with angles
over 90°.

144

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

If a gearmotor is delivered for a moving mounting position, the lubricant quantities and
the placement of the oil fittings are adapted accordingly.

Drive selection
Maximum speeds

6.6

Maximum speeds
The duty cycle of motors and gearmotors on the 50 Hz and 60 Hz grid will never reach
a critical value, if you follow the information and regulations described in this chapter.
The maximum speed is irrelevant for multi-speed motors and brakemotors. The "Drive
selection of pole-changing motors" (→ 2 170) chapter covers the torque behavior of
this drive type.
For electric motors that operate on a frequency inverter, the maximum torque and the
maximum speed must be viewed as mechanical limits.

The maximum torque is based on the load limit of the mechanical design of the shaft,
the bearings and the shaft sealing system.
Motors in the DRL.. design can be briefly and dynamically operated and loaded with a
higher torque due to their better dimensioned mechanical design. Please also refer to
the "Drive selection – DRL.. motors" (→ 2 186) chapter.
Additional loads that arise at the customer's location must be taken into account for all
DR. motors, e.g. additionally occurring overhung or axial loads due to belt drives.
The motor's maximum speed must not be exceeded. The following table displays
these values for standard motors. They apply to motors with fluorocarbon rubber oil
seals (FKM).
Additional motor options will
SEW‑EURODRIVE in such cases.

influence

these

speeds.

Please

contact

19290411/EN – 10/2014

Please also pay attention to the following for brakemotors:
•

The applicable drive selection regulations with regard to the braking work.

•

Braking from speeds of over 1800 rpm is not permitted for brake sizes BE30 and
above. Use the controller to reduce the speed before activating the mechanical
brake.

•

For 4/2-pole brakemotors with brake sizes BE30 and BE32, first switch from the 2pole speed to the 4-pole speed. The motor can then be switched off and the brake
activated when the 4-pole speed is reached.

Motor size

Mounted brakes

DT56

BMG02

6000

4500

DR 63

BR03

6000

4500

DR.71

BE05 or BE1

6000

4500

DR.80

BE05, BE1 or BE2

6000

4500

DR.90

BE1, BE2 or BE5

6000

4500

DR.100

BE2 or BE5

6000

3600

DR.112

BE5 or BE11

5000

3600

DR.132

BE5 or BE11

5000

3600

DR.160

BE11 or BE20

4500

3600

DR.180

BE20, BE30 or
BE32

4500

3600

DR.200

BE30 or BE32

3500

3600

2600

2500

BE60 or BE62

Maximum mechanical speed nmax in rpm
Motor
Brakemotor

Catalog – AC Motors DR.71 - 315, DT56, DR63

145

Drive selection
Maximum speeds

Motor size

Mounted brakes

DR.225

BE30 or BE32

3500

3600

BE60 or BE621)

2600

2500

BE60 or BE62

2600

2500

BE120 or BE122

2500

BE60 or BE62

2600

2500

BE120 or BE122

2500

BE120 or BE122

2500

DR.250
DR.280
DR.315

Maximum mechanical speed nmax in rpm
Motor
Brakemotor

1) Please contact SEW‑EURODRIVE when attaching the BE60/62 to the DR.200/225.

If a motor is equipped with a backstop, the sprag's lift-off speed represents the lower
speed limit during operation on a frequency inverter. The upper speed limit is limited to
5000 rpm, please also refer to the "Backstop" (→ 2 471) chapter.
Motor size

Locking torque
in Nm

Sprag lift-off speed in Maximum speed in rpm
rpm

890

5000

DR.80

130

860

5000

DR.90

370

750

5000

DR.100

370

750

5000

DR.112

490

730

5000

DR.132

490

730

5000

DR.160

700

4500

DR.180

1400

610

4500

DR.200

2500

400

3500

DR.225

2500

400

3500

DR.250

2600

400

2600

DR.280

2600

400

2600

DR.315

6300

320

2500

19290411/EN – 10/2014

DR.71

146

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Bearings

6.7

Bearings

6.7.1

Bearing types used

The standard motor bearings for sizes 71 – 225 are deep groove ball bearings, design
2Z-C3, on the A- and B-side.
2RS-C3 bearings are installed on the B-side for brakemotors up to motor size DR.
225.
If insufficient load values are achieved for axial and overhung loads with the deep
groove ball bearings, cylindrical roller bearings (SEW designation /ERF) can be installed on the A-side instead of the deep groove ball bearings for motor sizes 250 – 315.
The cylindrical roller bearings can only be used in connection with the relubrication device (SEW designation /NS).

To prevent destructive shaft currents during operation on the inverter, the standard
deep groove ball bearings on the B-side for motor sizes 250 – 315 can be replaced
with ball bearings with insulated bearing surface. The bearing sizes remain unchanged, but the designation changes to C3-EI or J-C3-EI.
The following tables display the bearing sizes used.
Motor type

A-side bearings
Foot-mounted
Gearmotor
and/or Flangemounted motor

B-side bearings
Motor
Brakemotor

DR.71

6204-2Z-J-C3

6303-2Z-J-C3

6203-2Z-J-C3

6203-2RS-J-C3

DR.80

6205-2Z-J-C3

6304-2Z-J-C3

6304-2RS-J-C3

DR.90/100

6306-2Z-J-C3

6205-2Z-J-C3

6205-2RS-J-C3

DR.112/132

6308-2Z-J-C3

6207-2Z-J-C3

6207-2RS-J-C3

DR.160

6309-2Z-J-C3

6209-2Z-J-C3

6209-2RS-J-C3

DR.180

6312-2Z-J-C3

6213-2Z-J-C3

6213-2RS-J-C3

DR.200/225

6314-2Z-J-C3

6214-2Z-J-C3

6214-2RS-J-C3

Motor type

DR.250
DR.280
DR.250../NS
DR.280../NS
DR.250../ERF/NS

6317-2Z-C4

A-side bearings
Foot-mounted
Gearmotor
and/or Flangemounted motor
6315-2Z-C3

6317-C4
6315-C3
NU 317 E C3

19290411/EN – 10/2014

DR.280../ERF/NS

A-side bearings
Foot-mounted
Gearmotor
and/or Flangemounted motor

Catalog – AC Motors DR.71 - 315, DT56, DR63

147

Drive selection
Bearings

Motor type

A-side bearings
Foot-mounted
Gearmotor
and/or Flangemounted motor

6319-J-C3

DR.315K
DR.315K../NS
DR.315S
DR.315S../NS
DR.315M

6319-J-C3

DR.315M../NS

6322-J-C3

DR.315L

6322-J-C3

DR.315L../NS
DR.315K../ERF/NS
DR.315S../ERF/NS
DR.315M../ERF/NS

6319-J-C3
NU 319 E

6322-J-C3

19290411/EN – 10/2014

DR.315L../ERF/NS

6319-J-C3

148

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Ventilation on the motor

6.8

Ventilation on the motor

6.8.1

Standard ventilation
The standard motor ventilation consists of a plastic fan that generates an air flow. The
air is conducted directly onto and into the cooling fins on the motor's stator housing by
the structural design of the fan guard and the fan grille. The fan guard consists of a
galvanized sheet steel.

Free air access
The fan-cooled motors require adequate space behind the fan guard in order to draw
in the air required for cooling. A distance of half the diameter of the fan guard is normally sufficient.
In order to inspect and maintain the brake, SEW-EURODRIVE recommends extending
this distance to the full diameter of the fan guard for the brakemotor. This ensures that
the fan guard can be removed in an axial direction.
When integrating a motor or brakemotor into a machine or system, ensure that the
heated air is not immediately drawn back in.
Space required to disassemble the fan guard.

19290411/EN – 10/2014

Motor size Mounted brakes

6.8.2

Free space required
Axial for normal
Axial for normal
motor fan guards in
brakemotor fan
mm
guards in mm

DR.71

BE05 or BE1

139

DR.80

BE05, BE1 or BE2

156

DR.90

BE1, BE2 or BE5

179

DR.100

BE2 or BE5

100

197

DR.112

BE5 or BE11

115

221

DR.132

BE5 or BE11

115

221

DR.160

BE11 or BE20

135

270

DR.180

BE20, BE30 or BE32

160

316

DR.200

BE30, BE32, BE60 or
BE62

200

394

DR.225

BE30, BE32, BE60 or
BE62

200

394

DR.250

BE60, BE62, BE120 or
BE122

255

510

DR.280

BE60, BE62, BE120 or
BE122

255

510

DR.315

BE120 or BE122

315

624

Low noise fan guard
Low-noise fan guards (SEW designation /LN) are available for motor and brakemotor
sizes DR.71 – 132, either as an option or as part of the design. The noise is reduced
by 3 – 5 dB(A).
These guards are not available for encoder mounting and for forced cooling fans.

Catalog – AC Motors DR.71 - 315, DT56, DR63

149

Drive selection
Ventilation on the motor

The low-noise fan guard is part of the series production for:

6.8.3

•

2-pole motors in sizes DR.71 – 132,

•

MOVIMOT® combinations in delta connection type.

Axially separable fan guards on the brakemotor, brakemotor with encoder or with a second
shaft end
Brake wear parts must be inspected and maintained on a cyclical basis for brakemotors. The information in the dimension sheets refers to the sufficient extra space in the
axial direction in order to be able to remove the brakemotor fan guard.
If this space is not structurally possible in the system or machine due to the installation
situation, the axially separable fan guard is an option that still allows the brake to
be inspected. This special brakemotor fan guard design is available for motor
sizes DR.71 – DR.225.
In this case, the brakemotor fan guard is split in half, please refer to the following diagram. The closing lever is normally positioned so it is aligned with the terminal box.
Please contact SEW‑EURODRIVE for different orientations.
When using the axially separable fan guards, please note that radial space is available
for opening the guard, please refer to the following diagram.

8937666955

Free space required
Radial for separaAxial for normal
brakemotor fan
ted brakemotor fan
guards
guards (A+E+G) × H
in mm

in mm × mm

DR.71

BE05 or BE1

139

230 × 230

DR.80

BE05, BE1 or BE2

156

250 × 250

DR.90

BE1, BE2 or BE5

179

285 × 285

DR.100

BE2 or BE5

197

315 × 315

DR.112

BE5 or BE11

221

350 × 350

DR.132

BE5 or BE11

221

350 × 350

DR.160

BE11 or BE20

270

425 × 425

DR.180

BE20, BE30 or BE32

316

485 × 485

BE30, BE32, BE60 or
BE62

394

610 × 610

DR.2251)

BE30, BE32, BE60 or
BE62

394

610 × 610

DR.200

150

Mounted brakes

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

Motor size

Drive selection
Ventilation on the motor

Motor size

Mounted brakes

Free space required
Axial for normal
Radial for separabrakemotor fan
ted brakemotor fan
guards
guards (A+E+G) × H
in mm

in mm × mm

BE60, BE62, BE120 or
BE122

510

DR.280

BE60, BE62, BE120 or
BE122

510

DR.315

BE120 or BE122

624

DR.250

19290411/EN – 10/2014

1) Please contact SEW-EURODRIVE when attaching the BE60/62 to the DR.200/225.

Catalog – AC Motors DR.71 - 315, DT56, DR63

151

Drive selection
Ventilation on the motor

6.8.4

Air filter
In an environment with high amounts of dust or suspended particles, the air required
to cool the motor blows these dirt particles around. In unfavorable conditions, this
leads to the constant increase in particle deposits between the cooling fins, so that the
dirt can no longer be blown away by the cooling air flow. In the worst case, the space
between the cooling fins is completely filled and the motor is no longer cooled, resulting in the thermal risk that the motor may be destroyed.
In these cases, an air filter can prevent this swirling effect and the resulting damage to
the motor. Conversely, the filtered particles must continuously be removed from the filter, as otherwise ventilation can no longer take place.
As a result, the air filter is fastened to the inner guard by an additional external guard
using a single bolt.
When using an air filter, please consider the space required to remove the additional
filter guard.

8937755787

Motor size

Mounted brakes

Free space required
Additional length Axial for disassembling
X (LB or LBS, see the attachment guard in
dimension sheet)
mm
in mm

BE05 or BE1

DR.80

BE05, BE1 or BE2

DR.90

BE1, BE2 or BE5

DR.100

BE2 or BE5

DR.112

BE5 or BE11

111

DR.132

BE5 or BE11

111

19290411/EN – 10/2014

DR.71

152

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Drive selection
Ventilation on the motor

6.8.5

Non-ventilated motors – without fan
The improvements described in the "Air filter" (→ 2 152) chapter can also be achieved
by not installing a fan. The lack of cooling means that the rated power in the sizes up
to DR.225 has to be reduced to about 50% of the ventilated operation. The required
power reduction is higher for sizes DR.250 and above.
In general, this means that the motor has to be two to three sizes larger for the same
power output.
Please contact SEW-EURODRIVE to obtain the precise size.

The non-ventilated design is released from the efficiency provisions in all countries. As
a result, non-ventilated motors are generally selected based on the DRS.. motor
types.
6.8.6

Non-ventilated motors – closed B-side
An alternative to the non-ventilated motor (without fan) is the motor design for which
the fan guard is not installed and the rotor is shortened so that the B-side endshield
can be designed in a closed form.
Once again, the motor only has a rated power of about 50% of the ventilated operation
for sizes up to DR.225. The required power reduction is also higher for sizes DR.250
and above.
This design is possible for sizes DR.71 – DR.280. Please contact SEW-EURODRIVE
to obtain the precise size.

6.8.7

Canopy
If a vertical motor design with upright fan guard is installed in the system or machine,
ensure that foreign bodies cannot penetrate through the fan grille into the fan wheel.
Two options are available:
•

structural measures in the system or the machine
or

•

the use of a canopy.

The canopy extends the motor or brakemotor. The specifications are provided in the
"Dimension sheets" (→ 2 199) chapter.

19290411/EN – 10/2014

Please contact SEW-EURODRIVE if there is the risk that parts may penetrate through
the side of the canopy, between the fan guard and the canopy. A canopy with a different design may be a solution.

Catalog – AC Motors DR.71 - 315, DT56, DR63

153

Drive selection
Second shaft end

6.9

Second shaft end
The motors are also available with a B-side shaft end. This so-called second shaft end
is constructed with a traditional keyway and key in accordance with DIN 6885 Sheet 1
(ISO 773).
These are available in the following designs for the series:
•

with a cover for motors/brakemotors DR.71 – DR.132

•

without a cover for motors/brakemotors DR.160 – DR.315, as the diameter of the
second shaft end is so large that damage during transport is unlikely.
A cover can be ordered for these sizes as an additional option.

6.9.1

Standard design
The standard design of the second shaft end for motors is generally smaller than described in EN 50347 for each number of poles and power.
SEW-EURODRIVE has decided to take this path in order to meet the demand for
combination with different brake sizes.

6.9.2

Reinforced design
The reinforced design of the second shaft end was developed as an alternative. This
design considers the maximum possible dimension of the second shaft end and can
only be combined with one brake size.

6.9.3

Second shaft end combinations with other design types
The second shaft end can be combined with the following design types and options.

Brakes

154

•

With fields marked with "•": Standard design and reinforced design is possible for
the second shaft end.

•

Fields marked with "x": only possible with a standard design of the second shaft
end.
BE1

BE2

BE5

DR.71S

•

DR.71M

•

DR.80S

•

DR.80M

•

DR.90M

•

DR.90L

•

DR.100M

•

DR.100L

•

DR.100LC

•

BE11

DR.112M

•

DR.132S

•

DR.132M

•

Catalog – AC Motors DR.71 - 315, DT56, DR63

BE20

BE30

BE32

19290411/EN – 10/2014

BE05

Drive selection
Second shaft end

BE05
DR.132MC

BE1

BE2

BE5

BE11

•

BE20

DR.160S

•

DR.160M

•

DR.160MC

•

BE30

BE32

DR.180S

•

DR.180M

•

DR.180L

•

DR.180LC

•

DR.200L

•

DR.225S

•

DR.225M

•

DR.225MC

•

Built-in encoder
Built-in encoders EI71, EI72, EI76 or EI7C can only be combined with the standard
design of the second shaft end, not with the reinforced second shaft end.
Fan guards

19290411/EN – 10/2014

The second shaft end can be combined with normal fan guards for motors and brakemotors or the separated fan guards for the brakemotor.

Catalog – AC Motors DR.71 - 315, DT56, DR63

155

Drive selection
Overhung and axial loads

6.10

Overhung and axial loads
Refer to the following diagrams for the permitted overhung load FRx for AC motors/
brakemotors. In order to read the permitted overhung load from the diagram, you must
know what the distance x is between the force application point of the overhung load
FR and the shaft shoulder.
All overhung load diagrams are designed for a bearing service life of 20000 hours. A
detailed bearing service life calculations is available on request.
The following figure shows the point of force application of the overhung load FRx at
point X.
l
x

FA
FRx

3980490891
l

= Length of the shaft end

= Distance between overhung load application point and shaft shoulder

FRx

= Overhung load at force application point

= Axial force

The following diagram shows an example of how you can read the overhung load from
the diagram:
1400

1200
Ø14x30

1000

F
[N]
Rx

Ø19x40
800
[2]
[1]

600

400
[1]

[2]

200

x [mm]

3980492555

156

[1]

Motor with shaft diameter 14 mm, force application x at 22 mm, permitted overhung load FRx = 600 N

[2]

Motor with shaft diameter 19 mm, force application x at 30 mm, permitted overhung load FRx = 700 N

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

Drive selection
Overhung and axial loads

During determining the overhung load, the transmission element factors fZ must be
considered. The transmission element factor depends on the used transmission element, such as gears, chains, V-belts, flat belts or toothed belts. When belt pulleys are
used, the initial belt tension must be considered as well. The overhung loads FR calculated with the transmission element factor must not exceed the permitted overhung
load of the motor.
Transmission element

Transmission element factor fZ

Comments

Direct drive

1.0

–

Gears

1.0

≥ 17 teeth

Gears

1.15

< 17 teeth

Sprockets

1.0

≥ 20 teeth

Sprockets

1.25

< 20 teeth

Narrow V-belt

1.75

Influence of the pre-tensioning
force

Flat belt

2.50

Influence of the pre-tensioning
force

Toothed belt

1.50

Influence of the pre-tensioning
force

Gear rack

1.15

< 17 teeth (pinion)

The following equation is used to calculate the overhung load with the transmission element factor fZ:
FR = fz × FRx
6.10.1

Permitted overhung load – 2-, 4-, 6-, 12-pole motors
The permitted overhung loads for 2-, 4-, 6- and 12-pole motors are displayed in the
individual size diagrams in the "Overhung load diagrams for 2-, 4-, 6- and 12-pole motors" (→ 2 159) chapter.
Only the sizes, not the design lengths, are displayed separately. The different shaft
ends are shown as separate curves, parallel in the diagram, if available.

6.10.2

Permitted overhung load – pole-changing motors
The determined FRx value for the motors is multiplied by a factor of 0.8 in order to define the permitted overhung load FRx-DRx/y for the relevant pole-changing motors.
FRx-DRx/y = 0.8 × FRx
The assignment for the conversion is as follows:
•

2-pole motors are used for the
– 4/2-pole motors with Dahlander winding
– 8/2-pole motors with separate winding

•

4-pole motors are used for the

19290411/EN – 10/2014

– 8/4-pole motors with Dahlander winding
6.10.3

Permitted overhung load of DRL.. motors
The determined FRx value for the 4-pole DRL.. motors of the same size is multiplied by
a factor of 0.8 in order to define the permitted overhung load FRx-DRL for the 4-pole
DRL.. motors.
FRx-DRL = 0.8 × FRx

Catalog – AC Motors DR.71 - 315, DT56, DR63

157

Drive selection
Overhung and axial loads

6.10.4

Permitted overhung load of DRM.. motors
The permitted overhung loads for the 12-pole torque motors are identical to the overhung loads for the 6-pole motors, please refer to the "Overhung load diagrams for 2-,
4-, 6-, 12-pole motors" (→ 2 159).

6.10.5

Permitted axial load
The permitted axial load FA is calculated by multiplying the determined overhung load
FRx by a factor of 0.2 for all DR.. series motor types:
•

FA = 0.2 × FRx

The axial load FA can load the motor's shaft end at the same time as the calculated
overhung load FR.
6.10.6

Overhung and axial loads at the second shaft end
The "Overhung load diagrams for 2-, 4-, 6-, 12-pole motors" (→ 2 159) also displays
the diagrams for the permitted overhung loads at the second shaft end for every motor
size. A distinction is made between motors and brakemotors as well as between
standard and reinforced second shaft ends.
Axial loads at the second shaft end may not exceed the information from the "Permitted axial load" (→ 2 158) chapter based on a directional addition.

6.10.7

Torques and duty types
The customer's motor shaft and bearings are designed for the overhung and axial
loads in the following diagrams in this chapter. The information is based on the nominal speed nN and the superimposed nominal torque MN in S1, S2 and S3 motor operation.
The second shaft end of the motor, shown as /2W in the diagrams, can transfer a
maximum of the motor's nominal torque MN in S1 operation.

19290411/EN – 10/2014

If conditions occur which are not considered in the descriptions or diagrams in this
chapter, consult SEW‑EURODRIVE.

158

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Overhung and axial loads

6.10.8

Overhung load diagrams for 2-, 4-, 6-, 12-pole motors

Overhung load diagram for DR.71
Overhung load diagrams for 2-, 4-, 6-, 12-pole DR.71 motors:
DR.71
1400

6,12

1200
1000
FRx [N]

Ø11x23
Ø14x30
Ø19x40
2

800
600
400
200
0
0

30
x [mm]

60
9007203235240331

2-pole

4-pole

6, 12:

6- and 12-pole

Overhung load diagram for DR.71 at the second shaft end
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.71 motors at the second shaft end:
DR.71/2W
400
Ø11x23
Ø11x23 BE/RS
Ø14x30
Ø14x30 BE/RS

350
300

FRx [N]

250
200
150
100
50
0

x [mm]

19290411/EN – 10/2014

3980502027

Catalog – AC Motors DR.71 - 315, DT56, DR63

159

Drive selection
Overhung and axial loads

Overhung load diagram for DR.80
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.80 motors:
DR.80
1600
6,12

1400

FRx [N]

1200

Ø19x40
Ø24x50

1000

800
600
400
200
0
0

40
x [mm]

70
9007203235245707

2-pole

4-pole

6, 12:

6- and 12-pole

Overhung load diagram for DR.80 at the second shaft end
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.80 motors at the second shaft end:
DR.80/2.WE

600

Ø14x30
Ø14x30 BE/RS
Ø19x40
Ø19x40 BE/RS

500

FRx [N]

400

300

200

100

30
x [mm]

19290411/EN – 10/2014

9007203235248395

160

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Overhung and axial loads

Overhung load diagram for DR.90 and DR.100
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.90 and DR.100 motors:
DR.90/100
3500
6,12

FRx [N]

3000
2500

2000

Ø24x50
Ø28x60

1500
1000
500
0
0

x [mm]
9007203235251083

2-pole

4-pole

6, 12:

6- and 12-pole

Overhung load diagram for DR.90 and DR.100 at the second shaft end
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.90 and DR.100 motors at the second
shaft end:
DR.90-100/2.WE
700
600
Ø14x30
Ø14x30 BE/RS
Ø19x40
Ø19x40 BE/RS

FRx [N]

500
400
300
200
100
0

30
x [mm]

19290411/EN – 10/2014

9007203235253771

Catalog – AC Motors DR.71 - 315, DT56, DR63

161

Drive selection
Overhung and axial loads

Overhung load diagram for DR.112 and DR.132
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.112 and DR.132 motors:
DR.112/132
4500

6,12

4000
3500
FRx [N]

Ø28x60
Ø38x80

3000

2500
2000
1500
1000
500
0
0

60
x [mm]

100

120
9007203235256459

2-pole

4-pole

6, 12:

6- and 12-pole

Overhung load diagram for DR.112 and DR.132 at the second shaft end
Overhung load diagram for 2-, 4-, 6-, 12-pole DR.112 and DR.132 motors at the second shaft end:
DR.112-132 /2.WE

900
800
700

FRx [N]

600
500
400
300

Ø19x40
Ø19x40 BE/RS
Ø24x50
Ø24x50 BE/RS
Ø28x60
Ø28x60 BE/RS

200
100
0
0

40
50
x [mm]

19290411/EN – 10/2014

9007203235259147

162

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Overhung and axial loads

Overhung load diagram for DR.160
Overhung load diagram for 4- and 6-pole DR.160 motors:
DR.160

6000

FRx [N]

5000

Ø38x80
Ø42x110

4000

3000
2000
1000
0

80
x [mm]

100

120

140

160
3980520843

4-pole

6-pole

Overhung load diagram for DR.160 at the second shaft end
Overhung load diagram for 4- and 6-pole DR.160 motors at the second shaft end:
DR.160/2.WE

3000

Ø28x60
Ø28x60 BE/RS
Ø38x80
Ø38x80 BE/RS

2500

FRx [N]

2000

1500

1000

500

60
x [mm]

100

120

19290411/EN – 10/2014

9007203235264523

Catalog – AC Motors DR.71 - 315, DT56, DR63

163

Drive selection
Overhung and axial loads

Overhung load diagram for DR.180
Overhung load diagram for 4-pole DR.180 motors:
DR.180

10000
9000

Ø42x110
Ø48x110
Ø55x110

8000
FRx [N]

7000
6000
5000
4000
3000
2000
1000
0

100

120

140

160

x [mm]
9007203235267211

Overhung load diagram for DR.180 at the second shaft end
Overhung load diagram for 4-pole DR.180 motors at the second shaft end:
DR

4500

0 /2.WE
Ø38x80
Ø38x80 BE /RS
Ø48x110
Ø48x110 BE /RS

4000
3500

FRx [N]

3000
2500
2000
1500
1000
500
0
0

80
x [mm]

100

120

140

160

19290411/EN – 10/2014

9007203235269899

164

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Overhung and axial loads

Overhung load diagram for DR.200 and DR.225
Overhung load diagram for 4-pole DR.200 and DR.250 motors:
DR.200/225
12000
Ø48x110
Ø55x110
Ø60x140 / Ø65x140

10000

FRx [N]

8000
6000
4000
2000
0
0

100
x [mm]

150

200
3980531595

Overhung load diagram for DR.200 and DR.225 at the second shaft end
Overhung load diagram for 4-pole DR.200 and DR.225 motors at the second shaft
end:
DR..200-225 /2.WE

6000

Ø48x110
Ø48x110 /BE/RS
Ø55x110
Ø55x110 BE /RS

5000

FRx [N]

4000

3000

2000

1000

0
0

80
x [mm]

100

120

140

160

19290411/EN – 10/2014

9007203235275275

Catalog – AC Motors DR.71 - 315, DT56, DR63

165

Drive selection
Overhung and axial loads

Overhung load diagram for DR.250 and DR.280
Overhung load diagram for 4-pole DR.250 and DR.280 motors:
DR250/280
20000
Ø60x140
Ø60x140 ERF
Ø65x140
Ø65x140 /ERF
Ø75x140
Ø75x140 /ERF
Begrenzung Fuß
AH 250

17500

FRx [N]

15000
12500
10000
7500
5000
2500
0

100
125
x [mm]

150

175

200
7290617227

Overhung load diagram for DR.250 and DR.280 at the second shaft end
Overhung load diagram for 4-pole DR.250 and DR.280 motors at the second shaft
end:
DR.250/280 /2W

7000
6000

Ø55x110
Ø55x110 BE/RS

FRx [N]

5000
4000
3000
2000
1000
0

75
x [mm]

100

125

150

19290411/EN – 10/2014

9007206545360651

166

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Overhung and axial loads

Overhung load diagram for DR.315
Overhung load diagram for 4-pole DR.315 motors:
DR.315

30000

Ø80x170../ERF/NS
Ø80x170

FRx [N]

25000

20000
15000
10000
5000
0
0

80
x [mm]

100

120

140

160
3980536971

INFORMATION
The conversion of the overhung load into the axial load (→ 2 158) must not be used
with reinforced bearings (../ERF).
The standard bearing value (lower curve) at point x is used for the conversion instead
of the value for /ERF (upper curve).
Overhung load diagram for DR.315 at second shaft end
Overhung load diagram for 4-pole DR.315 motors at the second shaft end:
DR.315/2W
10000
Ø70x140../2W
Ø70x140..BE../2W

FRx [N]

8000

6000

4000

2000

0
0

100

125

150

175

200

19290411/EN – 10/2014

x [mm]
9007203235281035

Catalog – AC Motors DR.71 - 315, DT56, DR63

167

Drive selection
Center of gravity of motors

6.11

Center of gravity of motors
The center of gravity of a motor is a theoretical variable which assumes that the entire
mass of the motor is concentrated in one point and acts on this point with the weight
Fq. The mass of the motor can be found in the chapter "Technical motor
data" (→ 2 91).
The center of gravity of the motor must also be taken into account when combining
gear units with flange motors and, if applicable, with feet attached with the aid of
adapters.
Center of gravity S
in mm

Brakemotor type

Brake

S
3980543755

168

Center of gravity S
in mm

3980546443

DR.71S

BE05

DR.71M

BE1

108
112

DR.80S

106

DR.80S

BE1

148

DR.80M

119

DR.80M

BE2

150

DR.90M

118

DR.90M

BE2

142

DR.90L

124

DR.90L

BE5

151

DR.100M

137

DR.100M

BE5

165

DRP100M

140

DR.100L / LC

153

DR.100L / LC

BE5

180

DR.112M

153

DR.112M

BE5

179
202

DR.132S

167

DR.132S

BE11

DR.132M / MC

193

DR.132M / MC

BE11

226

DR.160S

205

DR.160S

BE20

265

DR.160M / MC

205

DR.160M / MC

BE20

255

DR.180S

224

DR.180S

BE20

287

DR.180M

224

DR.180M

BE30

302

DR.180L

237

DR.180L

BE32

321

DR.180LC

237

DR.180LC

BE32

318

DR.200L

228

DR.200L

BE32

340

DR.225S

250

DR.225S

BE32

340

DR.225M

264

DR.225M

BE32

363

DR.225MC

264

DR.225MC

BE32

354

DR.250M

321

DR.250M

BE62

420

DR.280S

341

DR.280S

BE62

433

DR.280M

341

DR.280M

BE122

442

DR.315K / S

419

DR.315K / S

BE122

489

DR.315M / L

505

DR.315M / L

BE122

550

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

Motor type

Drive selection
Drive selection – non-controlled motor

6.12

Drive selection – non-controlled motor
The following flow diagram illustrates the project planning procedure for a non-controlled drive. The drive consists of a gearmotor operated on the grid.

6.12.1

Flow diagram
Necessary information on the machine to be driven
•

Technical data and environmental conditions

•

Positioning accuracy

•

Speed setting range

•

Calculation of the travel cycle

↓
Calculation of the relevant application data
•

Travel diagram

•

Speeds on 50 Hz or 60 Hz supply system

•

Static, dynamic torques

•

Regenerative power
↓

Gear unit selection
•

Define gear unit size, gear unit ratio, and gear unit type

•

Check positioning accuracy

•

Check gear unit utilization (Ma max ≥ Ma (t))

•

Check input speed (churning losses)
↓

Motor selection
•

Maximum torque

•

With dynamic drives: effective torque at medium speed

•

Maximum speed

•

Determine energy efficiency class IE

•

Observe dynamic and thermal torque curves

•

Select the correct encoder

•

Motor equipment (brake, plug connector, thermal motor protection, etc.)
↓

Braking resistor selection
19290411/EN – 10/2014

•

Based on the calculated regenerative power, cdf, and peak breaking power.
↓

Make sure that all requirements have been met.

Catalog – AC Motors DR.71 - 315, DT56, DR63

169

Drive selection
Drive selection – non-controlled motor

6.12.2

Drive selection for pole-changing motors
The following windings are distinguished for pole-changing motors:
•

Separate winding: 8/2-pole DRS.. motors

•

Dahlander winding: 4/2, 8/4-pole DRS.. motors

Description of switching torque
The functioning of the switchover from the 2-pole to the 8-pole winding is explained on
the basis of the 8/2 pole motor.
If the 8-pole winding is connected to the supply system from the operation of the 2pole speed, with virtually no period of no-load operation, the motor briefly functions as
a generator due to the above-synchronous speed. The transformation of kinetic energy into electrical energy decelerates it to the lower speed in a low-loss, wear-free
manner.
To be able to calculate the mean switching torque as a first approximation, the available kinematic data is employed.
MU = fU × MA8
MU =

geometrically averaged switching torque from high to low speed in Nm.

MA8 =

starting torque in low speed in Nm.

fU =

averaged factor of 8-pole winding's regenerative torque curve.

If the switching torque is too high, SEW-EURODRIVE recommends the use of the
WPU smooth-pole change unit.
DRS90M8/2

M [Nm]
15

MA8

MH8

Mn,S3(2)
Mn,S1(2)

[1]

Mn,S3(8)

5
0

Mkmot(2)

Mkmot(8)

MA2

Mn,S1(8)

MH2

n [1/min]
250

500

750

1000

1250

1500

1750

2000

2250

2500

2750

3000

-5

-10
[2]

-15

-20

-25
Mkgen(8)
-30

170

[1]

Characteristic curve:
2-pole

Mkmot =

motor breakdown torque

[2]

Characteristic curve:
8-pole

Mkgen =

regenerative breakdown torque

MA8 =

starting torque: 8-pole

MH =

acceleration torque

MA2 =

starting torque: 2-pole

MU =

mean switching torque from high to low
speed

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

9007204661919627

Drive selection
Drive selection – non-controlled motor

MU values of 8/4 pole motors (S1)
The following table shows the factors fU and the MU torques of the 8/4-pole motors.
MA8 in Nm

MU in Nm

DRS71S8/4

2.3

2.4

5.5

DRS71M8/4

3.8

2.4

9.1

DRS80M8/4

5.3

2.3

12.3

DRS90M8/4

8.5

2.2

18.6

DRS90L8/4

10.8

2.2

23.8

DRS100M8/4

15.5

2.0

31.0

DRS100L8/4

21.3

2.0

42.5

DRS112M8/4

32.3

2.0

64.6

DRS132S8/4

45.0

2.0

90.0

DRS132M8/4

56.0

2.0

112

DRS160S8/4

74.8

2.0

150

DRS160M8/4

99.4

2.0

199

DRS180S8/4

158

2.0

316

DRS180L8/4

234

2.0

468

DRS200L8/4

343

2.0

686

DRS225S8/4

455

2.0

910

DRS225M8/4

557

2.0

1114

19290411/EN – 10/2014

Motor type

Catalog – AC Motors DR.71 - 315, DT56, DR63

171

Drive selection
Drive selection – non-controlled motor

MU values of 8/2 pole motors
The following table shows the factors fU and the MU torques of the 8/2-pole motors.
Motor type (S3/40/60%)

MA8 in Nm

MU in Nm

DRS71S8/2

1.42

2.1

2.98

DRS71M8/2

2.29

2.5

5.72

DRS80S8/2

3.26

2.3

7.49

DRS80M8/2

5.25

2.1

11.0

DRS90M8/2

5.64

2.3

13.0

DRS90L8/2

8.36

1.8

15.0

DRS100M8/2

12.0

1.8

21.6

DRS112M8/2

16.2

1.8

29.2

DRS132M8/2

22.2

2.2

48.8

MA8 in Nm

MU in Nm

DRS71S8/2

1.04

2.1

2.19

DRS80S8/2

3.26

2.3

7.49

DRS80M8/2

5.25

2.1

11.0

DRS90L8/2

7.47

1.8

13.5

DRS100M8/2

10.0

1.8

18.0

DRS132M8/2

22.2

2.2

48.8

19290411/EN – 10/2014

Motor type (S1)

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Drive selection
Drive selection – non-controlled motor

MU values of 4/2 pole motors
The following table shows the factors fU and the MU torques of the 4/2-pole motors.
MA4 in Nm

MU in Nm

DRS71S4/2

2.57

3.1

7.95

DRS71M4/2

4.43

3.1

13.7

DRS80M4/2

10.1

3.4

34.4

DRS90M4/2

14.7

3.3

48.5

DRS90M4/2

19.1

3.3

63.0

DRS100M4/2

27.0

3.5

94.5

DRS100L4/2

37.6

3.5

132

DRS132S4/2

39.1

2.0

78.1

DRS132M4/2

54.9

2.0

110

DRS160S4/2

97.5

2.0

195

DRS160M4/2

126

2.0

253

DRS180L4/2

219

2.0

440

DRS180L4/2

288

2.0

575

19290411/EN – 10/2014

Motor type

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Drive selection
Drive selection – global motor

6.13

Drive selection – global motor
When selecting a global motor, the following properties should be taken into account.

6.13.1

Gear unit reduction ratios for the global motor
The global motor is supplied with the electrical specifications for 50 Hz and 60 Hz. If
the motor is combined with an additional transmission or a gear unit, it should be noted that the reduction ratio is generally only determined for one of the two frequencies.
If the reduction ratio is calculated for 50 Hz and the gear unit configured accordingly,
this results in the behavioral changes described in the chapter "50 Hz motors on 60 Hz
supply systems" (→ 2 127) when operated on a 60 Hz system.
If operation on the 60 Hz supply system represents the initial situation, the ratios from
the chapter "50 Hz motors on 60 Hz supply systems" (→ 2 127) are reversed.
These ratio changes must be taken into account when designing machines and systems.

6.13.2

Identification of degrees of protection
SEW-EURODRIVE classifies the motor degrees of protection according to the international standard IEC 60034-5; see chapter "Degrees of protection to EN/IEC
60034-5" (→ 2 139).
In North America, on the other hand, identification of a different degree of protection is
required by the relevant standards.
The degree of protection is represented by an abbreviation made up of four characters. In the case of the global motor, SEW-EURODRIVE employs the following identifications and includes this information on the nameplate.
Abbrevi- English designation
ation

German translation

TEFC

Totally Enclosed Fan Cooled

völlig geschlossen, Lüfter gekühlt

TEBC

Totally Enclosed Blower Cooled

völlig geschlossen, Fremdlüfter gekühlt

In NEMA MG1, degrees of protection IP54 to IP66 are all classified as fully enclosed.
6.13.3

Voltage tolerances
If multiple voltages are included on a motor nameplate, the actual limit values and tolerances must be considered.
The motor standard IEC 60034 comprises two tolerance ranges. If no tolerance is
specified on the nameplate, a voltage tolerance of ± 5% applies. For more information,
refer to the chapter "Motor standard IEC 60034" (→ 2 25).

In 60 Hz systems, the usual tolerance is ±10 % and normally indicated without additional information on the nameplate.
In order to implement motor and supply system standards for products such as the
global motor, the voltage range was created.
The specification of an upper and lower voltage, each with a ± 5% tolerance, results in
a combined tolerance of ± 10% for the median voltage.
This procedure is employed for the tolerances of the voltage blocks specified in the
chapter "Global motor" (→ 2 45).

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The voltages in 50 Hz supply systems are generally based on the standard IEC 38.
Here, the tolerance range is ±10%.

Drive selection
Drive selection – global motor

6.13.4

Global motor with brake
In many drive situations and applications, it is sufficient to tap the brake voltage from
the supply voltage of the motor.
If the motor is configured for the 50 Hz and 60 Hz voltage range, the brake voltage
covers a very large range.

19290411/EN – 10/2014

As described in the chapter "Brake voltage" (→ 2 126), the brake must not be released
at the upper voltages in these cases without activating the motor in order to cool the
brake with the motor cooling air.

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Drive selection
Drive selection – DRM.. torque motors

6.14

Drive selection – DRM.. torque motors

6.14.1

Special aspects of torque motors and low-speed motors
Due to the design of torque motors and low-speed motors, very high induction voltages may be generated when they are switched off. SEW‑EURODRIVE recommends
using the varistor circuit shown below for protection. The size of the varistors depends,
amongst other factors, on the starting frequency. This must be taken into account during project planning.

W1
4754651531

The varistor protection circuit can be obtained from SEW-EURODRIVE. Please specify the desired starting frequency with your order.
6.14.2

R13 wiring diagram
The conventional torque motor operation is measured in a star connection in S1 continuous duty.
If the same torque motor is used in a delta connection, the usual factor of 3 for AC
motors no longer applies due to the weak magnetic field saturation of the star connection. The influence of the magnetic stray fields in the star or delta connection is no longer proportional. As a result, the torque motor in the delta connection develops a higher torque than that produced by the factor of 3. In return, the operating time must be
reduced to S3/15%.
Alternatively, the reduction of the operating time can be compensated by means of a
forced cooling fan.

6.14.3

R23 wiring diagram
For applications that use the two connection types star and delta alternately and must
not have more than the 3 times the torque of the star connection in the delta connection, SEW‑EURODRIVE offers the connection type R23. Only part of the winding is
activated in the case of the delta connection.

6.14.4

Restrictions due to combinations with options and variations
As a result of the non-ventilated operation, the components and component parts of
the torque motors are subject to greater thermal stress at a standstill than a normal
AC motor.
Therefore, all variations and options that cannot be subjected to high thermal loads
must be excluded from the combination with torque motors.

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Please consult SEW‑EURODRIVE if necessary.

Drive selection
Drive selection – DRM.. torque motors

These include:

6.14.5

•

The backstop: The grease used within the backstop to ensure the mobility of the
blocking bodies reaches impermissibly high temperatures, which can affect the torque motor when at a standstill.

•

The EI7 built-in encoders: When used with a torque motor, the installation space
before the fan and behind the B-side flange is heated to a point that the electronic
components of the sensor technology may be damaged.

•

The EI7 built-in encoders are only approved for use in combination with the optional /V forced cooling fan. Without additional cooling, the rise in temperature before
the fan and behind the B-side flange is too high.

•

The add-on encoders with direct shaft-shaft connection: Due to the transfer of heat
energy from the rotor to the shaft of the encoder, the latter reaches impermissibly
high temperatures. The use of a coupling for the encoder mounting, as a means of
interrupting the heat transfer, is permitted.

•

The thermal class 180 (H): Use of the thermal class 180 (H) would stress the gaskets, bearings, and bearing lubricants beyond the permitted temperature thresholds.

Flow diagram
The following diagram illustrates the basic drive selection process for a geared torque
motor.

INFORMATION

19290411/EN – 10/2014

SEW-EURODRIVE recommends the use of a /TF temperature sensor in duty type
S3/15% cdf or when operated with a /V forced cooling fan.

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Drive selection
Drive selection – DRM.. torque motors

Required output speed on the gear unit
Required output torque on the gear unit
Required tightening torque (force) on the gear unit
Required cyclic duration factor

Frequency
= 50 Hz?

Frequency
= 60 Hz?

Yes

i = 400 [rpm]/output speed [rpm] 1)

i = 480 [rpm]/output speed [rpm] 1)
Technical data:
Tightening torque M o of the torque motor at
500 rpm / 50 Hz
600 rpm / 60 Hz

Motor torque [Nm] =
Required output torque [Nm] / i
Required tightening torque of the torque motor
= twice the motor torque (continuous duty S1)

M0 is lower
than the required
tightening torque

Yes

Choose the next largest
torque motors

Is a larger
torque motor
available?

No
M0 x i = calculated tightening torque
of the gear unit torque motors
Definition of the gear unit type: Helical gear, parallel,
bevel gear, SPIROPLAN ® or helical-worm gear unit
Determination of the variant and gear unit size
of the gear unit torque motors 2)
Checking the gear unit
– calculated i within the possible range according to
overview of combinations
– calculated tightening torque
M a < Mamaxof the gear unit 2)
– check overhung loads 2)
– dimension sheet with the installation dimensions 2)

Yes

No
Is forced
air cooling
allowed?

Yes

change from rating I
to rating III 3)
with forced air
cooling. Notice:
approx. triple Ma

Yes

change from rating I
to rating III 3)
with forced air
cooling. Notice:
approx. triple Ma

Is intermittent
duty possible?

No
Is the
check OK?

Consultation with
SEW EURODRIVE needed.

Yes
Submit order
to SEW

1) The speeds of 400 and 480 rpm during operation with approx. half the initial torque
only serve to calculate the required gear ratio
2) See "Geared torque motor" catalog
3) Rating I: duty type S1/100% cdf;
Rating II: duty type S3/15% cdf: 3x to 5x standstill torque (R13)
Rating III: duty type S3/15% cdf: 3x standstill torque (R23)
Rating IV: duty type S1 with /V forced cooling fan

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4754659339

Drive selection
Drive selection – controlled motor

6.15

Drive selection – controlled motor

6.15.1

Flow diagram

The following flow diagram illustrates the drive selection procedure for a positioning
drive. The drive consists of a gearmotor that is powered by an inverter.
Necessary information on the machine to be driven
•

Technical data and environmental conditions

•

Positioning accuracy

•

Speed setting range

•

Calculation of the travel cycle

↓
Calculation of the relevant application data
•

Travel diagram

•

Speeds on 50 Hz or 60 Hz supply system

•

Static, dynamic torques

•

Regenerative power
↓

Gear unit selection
•

Define gear unit size, gear unit ratio, and gear unit type

•

Check positioning accuracy

•

Check gear unit utilization (Ma max ≥ Ma (t))

•

Check input speed (churning losses)
↓

Motor selection
•

Maximum torque

•

With dynamic drives: effective torque at medium speed

•

Maximum speed

•

Determine the necessary energy efficiency class IE

•

Observe dynamic and thermal torque curves

•

Select the correct encoder based on the required positioning

•

Motor equipment (brake, plug connector, thermal motor protection, etc.)
↓

19290411/EN – 10/2014

Inverter selection
•

Motor/inverter assignment

•

Continuous current and peak current for current-controlled inverters/axes
↓

Braking resistor selection
•

Based on the calculated regenerative power, cdf

•

Based on the cyclic duration factor and peak braking power
↓

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Drive selection
Drive selection – controlled motor

Options
•

EMC measures

•

Operation/communication

•

Additional functions
↓

19290411/EN – 10/2014

Make sure that all requirements have been met.

180

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Drive selection
Drive selection – controlled motor

6.15.2

Inverter operation in VFC and VFC-n mode

SEW frequency inverter range
The extensive product range of SEW‑EURODRIVE inverters is available for designing
electronically controlled drives.
The following inverters are available for voltage-controlled flux vector control (VFC):
•

MOVITRAC® LTP-B: Simple and inexpensive frequency inverter for the 0.75 – 160
kW power range. Single-phase line connection for 230 V AC (up to 2.2 kW power
rating) and three-phase 200 – 240 V AC / 380 – 480 V AC / 500 – 600 V AC (as of
0.75 kW power rating).

•

MOVITRAC® 07B: Compact and inexpensive frequency inverter for the 0.25 – 160
kW power range. Single-phase and three-phase line connection for 230 V AC and
three-phase line connection for 400 – 500 V AC.

•

MOVIDRIVE® MDX60/61B: High-performance drive inverter for dynamic drives in
the 0.55 – 250 kW power range. Great diversity of applications due to extensive
expansion options with technology and communication options. Three-phase line
connection for 230 V AC and 400 – 500 V AC.

The following inverter is available for voltage-controlled flux vector control with speed
feedback (VFC-n):
•

The DRS.., DRE.., DRP.. AC motors can be operated with the inverters listed above.

MOVITRAC® 07B

19290411/EN – 10/2014

MOVITRAC® LTP-B

MOVIDRIVE®
MDX60/61B

8723978507

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Drive selection
Drive selection – controlled motor

Product characteristics of inverters
The following table lists the most important product characteristics for the various inverter series. You can choose the inverter series matching your application based on
these product characteristics.
Product characteristics

MOVITRAC® LTP-B

MOVITRAC® 07B

MOVIDRIVE® MDX60/61B

Voltage range

1 × 200 – 240 V AC

1 × 200 – 240 V AC (limited power range)

3 × 200 – 240 V AC (limited power range)

3 × 380 – 500 V AC

(0.75 to 2.2 kW)
3 × 200 – 240 V AC
(0.75 to 75 kW)

3 × 380 – 500 V AC

3 × 380 – 480 V AC
(0.75 to 160 kW)
3 × 500 – 600 V AC
(0.75 to 110 kW)
Power range

0.75 – 15 kW (IP20)

0.25 – 75 kW

0.55 – 250 kW

0.75 – 160 kW (IP55)
Nominal current
range of the axis
modules
Overload capacity

–

150% IN for 60 seconds
175% IN for 2 seconds

4Q capable
Integrated line filter

4 – 250 A

150% IN1) briefly and 125% IN continuously in operation
without overload

Yes, with integrated brake chopper as standard.
At 1 × 200 – 240 V AC: ac- At 1 × 200 – 240 V AC: according to limit value class cording to limit value class
B
B

According to limit value
class A for sizes 0, 1, and
2

At 3 × 200 – 240 V AC and At 3 × 200 – 240 V AC and
3 × 380 – 480 V AC: ac3 × 380 – 500 V AC: according to limit value class cording to limit value class
A
A for sizes 0, 1, and 2
Control modes

Speed feedback
Integrated positioning and sequence
control system

Yes
U/f or voltage-controlled
flux vector control (VFC)

U/f or voltage-controlled
flux vector control (VFC)

U/f or voltage-controlled
flux vector control (VFC),
with speed feedback speed
control and current-controlled flux vector control
(CFC).

Option in preparation

Option

Standard

Serial interfaces

182

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System bus (SBus) and RS485

19290411/EN – 10/2014

TF input

Drive selection
Drive selection – controlled motor

Product characteristics

MOVITRAC® LTP-B

MOVITRAC® 07B

MOVIDRIVE® MDX60/61B

Fieldbus interfaces

CANopen, Modbus RTU,
optional via gateway
PROFIBUS, EtherCAT®,
PROFINET, DeviceNet,
Ethernet/IP

Optional via gateway
PROFIBUS, INTERBUS,
CANopen, DeviceNet,
Ethernet

Optional PROFIBUS-DP,
INTERBUS, INTERBUS
LWL, CANopen,
DeviceNet, Ethernet

Technology options

IEC-61131 control

Input/output card

Synchronous operation
Absolute encoder card
IEC-61131 control
Max. speed
STO – Safe Torque
Off
Approvals

30,000 rpm at 500 Hz

5,500 rpm

6,000 rpm

Yes

UL and cUL approval, C-Tick

19290411/EN – 10/2014

1) Only for MOVIDRIVE® MDX60/61B: The temporary overload capacity of size 0 units (0005 – 0014) is 200% IN.

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Drive selection
Drive selection – controlled motor

6.15.3

Inverter operation of DRL.. motors in CFC mode

Range of products
The extensive product range of SEW‑EURODRIVE inverters is available for designing
electronically controlled drives with current-controlled flux vector control (CFC).
•

•

MOVIAXIS® MX: Powerful and versatile multi-axis servo inverter with axis module
nominal currents of 2 – 133 A. Great diversity of applications thanks to extensive
expansion options with technology and communication options, as well as optional
sinusoidal or block-shaped regenerative power supply. Three-phase line connection for 380 – 500 V AC.

The asynchronous DRL.. servomotors can be operated with the inverters listed above.
MOVIAXIS® MX

3980579083

184

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MOVIDRIVE®
MDX60/61B

Drive selection
Drive selection – controlled motor

Product characteristics
The following table lists the most important product characteristics for the various inverter series. You can choose the inverter series matching your application based on
these product characteristics.
Product characteristics
Voltage range

MOVIDRIVE® MDX60/61B

MOVIAXIS® MX

3 × 200 – 240 V AC

3 × 380 – 500 V AC

(1.5 to 30 kW)
3 × 380 – 500 V AC
(0.55 to 250 kW)
Power range
Nominal current
range of the axis
modules
Overload capacity

0.55 – 250 kW

10 – 75 kW

4 – 250 A

2 – 133 A

150 % IN1) briefly and 125% IN
continuously in operation without overload

250% for max. 1 second

4Q capable

Yes, with integrated brake chopper as standard.

Integrated line filter

Sizes 0, 1, and 2

External line filter

according to limit value class
A
TF input
Control modes

Speed feedback

Yes
U/f or voltage-controlled flux
vector control (VFC), with
speed feedback speed control
and current-controlled flux
vector control (CFC).

Current-controlled flux vector
control

Option

Integrated in basic unit

Integrated positioning and sequence
control system
Serial interfaces

Standard

System bus (SBus)

19290411/EN – 10/2014

and RS485

CAN-based system bus, optional EtherCAT®-compatible
system bus

Fieldbus interfaces

Optional PROFIBUS-DP, INTERBUS, INTERBUS LWL,
CANopen, DeviceNet, Ethernet

Optional PROFIBUS-DP,
EtherCAT®

Technology options

Input/output card

IEC-61131 control

Synchronous operation, electronic gear unit, touch probe,
event control, electronic cam,
virtual encoder, single-axis positioning

6,000 rpm

10,000 rpm

Yes

Option

Synchronous operation
Absolute encoder card
Max. speed
STO – Safe Torque
Off

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Drive selection
Drive selection – controlled motor

Product characteristics

MOVIDRIVE® MDX60/61B

Approvals

MOVIAXIS® MX

UL and cUL approval, C-Tick

1) The temporary overload capacity of size 0 units (0005 – 0014) is 200% IN.

6.15.4

Drive selection –DRL.. motors
Tapping the full potential of an asynchronous servomotor requires the selection of an
appropriate drive.
The schematic procedure is detailed in the chapter "Drive selection – controlled motor" (→ 2 179).

Dynamics package D1 or D2
During the drive selection, you must decide which dynamics package is required and
will be implemented.
Predeterminations will then be made on this basis, particularly with regard to the size
of the inverter.
The higher inertia levels of the DRL.. motor when compared to synchronous servomotors – roughly a factor of 10 or more – are of great benefit when controlling loads with
high mass moments of inertia, even when taking gear unit reduction ratios into account.
For detailed information, refer to the chapter "Product description – asynchronous servomotors of the DRL.. series" (→ 2 50).
The technical data for the DRL.. motors and the limit values of the D1 or D2 dynamics
packages are provided in the chapter "Technical data – DRL.. asynchronous servomotors.." (→ 2 117).
Sine encoder
The standard drive package of the of the DRL.. motors includes a sine encoder:
•

DRL71 – DRL132 with ES7S

•

DRL160 – DRL225 with EG7S

This sine encoder has a resolution of 1024 sine cycles.
The interpolation of the sin/cos signals in the inverter greatly increases the available
speed information, resulting in a usable speed setting range of 1:5000 and highly accurate operation at speeds below 1 rpm.
Startup is simplified by the electronic nameplate included in the encoder.
Detailed information can be found in the chapter "Encoders" (→ 2 431).

Instead of the sine encoder, an absolute encoder can be installed at the same location
without additional length.
•

DRL71 – DRL132 with AS7W or AS7Y

•

DRL160 – DRL225 with AG7W or AG7Y

The SSI encoder (A.7Y) establishes the connection to the functional safety elements
in the control cabinet.
Startup is simplified by the electronic nameplate included in the encoder.
Detailed information can be found in the chapter "Encoders" (→ 2 431).

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Absolute encoder

Drive selection
Drive selection – controlled motor

Forced cooling fan
The use of a /V forced cooling fan prevents the reduction in permissible load torque at
speeds below 900 rpm.
In fact, the relationship is reversed, meaning that the permitted torque at speed "0" is
approx. 10 – 15% higher than the nominal torque when a forced cooling fan is used.
Detailed information can be found in the chapter "Forced cooling fans" (→ 2 503).
The limit characteristic curves of the DRL.. motors are covered separately in the manual "AC motors – inverter assignments and characteristic curves".

Inverter utilization
When selecting the drive for an asynchronous servomotor, the following variables apply:
•

The mean (effective) speed

•

The mean (effective) torque

•

The maximum speed

•

The maximum dynamic torque

To select a suitable inverter, you must check the thermally decisive elements in the
limit characteristic curves with 100% IN and the peak values in the diagrams with
150%/200% IN.
Technical data for the DRL.. motors can be found in the chapter "Technical data –
asynchronous DRL.. servomotors" (→ 2 117).
The combinations and limit characteristic curves of the DRL.. motors with
MOVIDRIVE® and MOVIAXIS® are covered in full in the manual "AC motors – inverter
assignments and characteristic curves".
The maximum speeds of the motors are specified in the chapter "Maximum
speeds" (→ 2 145).
6.15.5

Drive selection example – asynchronous DRL.. servomotor
The schematic drive selection procedure is detailed below using the example of a vehicle.

Description of the application
The following data is provided.

19290411/EN – 10/2014

Description

Symbol

Value

Unit

Mass of the load

300

Mass of the carriage

800

Traveling velocity

m/s

Acceleration

m/s2

Deceleration

m/s2

Diameter of gear rack pinion

Resistance to vehicle motion

N/t

Efficiency of the system

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Drive selection
Drive selection – controlled motor

This results in the following data.
Description

Symbol

Value

Unit

Maximum output torque

102.2

Maximum output speed

477.5

rpm

Symbol

Value

Unit

itarget

6.28

Symbol

Value

Unit

Gear unit size

K47

Gear unit ratio

iactual

5.81

Gear unit selection
The following data is provided:
Description
Gear unit ratio
Selecting the gear unit size and reduction ratio:
Description

INFORMATION
The overhung load is too high with the recommended transmission element factor for
gear rack pinions of fz = 2 (FR = 5437 N); see section "Overhung and axial
loads" (→ 2 156). This must either be compensated by a suitable bearing for the gear
rack pinion, or a larger gear unit must be selected.
Motor selection
Maximum operating point
Conversion of the torque to the motor side:
Mmax = M / η / iactual
Mmax = 102.2 Nm / 0.9 / 5.81
Mmax = 19.56 Nm
Conversion of the speed to the motor side:
nmax = n × iactual
nmax = 477.5 rpm × 5.81
nmax = 2774 rpm
Mmax and nmax denote the maximum operating point; in this case, Mmax is required at
nmax.
Effective operating point
Meff = 8.26 Nm
at a speed of
nn = 1981 rpm
Motor preselection
The motor size DRL90L4 was preselected.
Mbase = 19.9 Nm

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The effective operating point was calculated as

Drive selection
Drive selection – controlled motor

nbase = 2683 rpm
Checking the relationship of the mass moment of inertia results in the following:
Jext/Jmot = 12.03
The ratio of 12.03 is acceptable for a dynamic vehicle drive.
MOVIDRIVE® B inverter selection
•

The effective operating point (F) for the motor must be below the S1 limit curve. The
thermal load on the motor is thus within the permitted range.

•

The effective operating point (F) in the speed/torque diagram for 100% inverter utilization must be below the characteristic curve for the motor/inverter combination to
be selected. The load on the inverter (continuous duty) is thus within the permitted
range.

•

In the speed/torque diagram for 150% inverter utilization, the maximum operating
point (M) (possibly two different points for maximum speed and maximum torque)
must be below the characteristic curve for the motor/inverter combination to be selected. The load on the inverter (maximum operation) is thus within the permitted
range.

DRL90L4, nN = 3000 rpm, 100% IN
Determining the effective operating point:
DRL 90L4

n = 3000 1/min

100% IN

50
45
[15]

[4]

40
35

M in Nm

[3]

25
20

[13]

[14]

15
10

8.26

[1]

[2]

5
0

1981
0

500

1000

1500

2000
2500
n in 1/min

3000

3500

4000

4500

19290411/EN – 10/2014

9007203235308555

[1]

S1 characteristic curve

[13] 5.5 kW inverter power

[2]

S1 characteristic curve with forced cooling
fan

[14] 7.5 kW inverter power

[3]

Maximum limit torque of dynamics package
1

[15] 11 kW inverter power

[4]

Maximum limit torque of dynamics package
2

DRL90L4, nN = 3000 rpm, 150% IN

Catalog – AC Motors DR.71 - 315, DT56, DR63

189

Drive selection
Drive selection – controlled motor

Determining the maximum operating point:
DRL 90L4

n = 3000 1/min

150% IN

50
45
[4]

[15]

[14]

35
[13]

M in Nm

[3]

[12]

19.56
15
[2]

[1]

5
0
0

500

1000

1500

2000
2500
n in 1/min

2774

3000

3500

4000

4500

9007203235312267

[1]

S1 characteristic curve

[12] 4 kW inverter power

[2]

S1 characteristic curve with forced cooling
fan

[13] 5.5 kW inverter power

[3]

Maximum limit torque of dynamics package
1

[14] 7.5 kW inverter power

[4]

Maximum limit torque of dynamics package
2

[15] 11 kW inverter power

INFORMATION
The inverter current at motor standstill should be less than 70% of the nominal motor
current.
The required drive inverter has thus been determined:
•

MDX61B0055-5A3

Result of the drive selection
Selected gearmotor in dynamics package 1 and speed class 3000 rpm:
•

K47 DRL90L4/F./TF/ES7S

•

190

MDX61B0055-5A3 with 5.5 kW inverter power

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

Selected drive inverter:

Drive selection
Drive selection – controlled motor

6.15.6

Reinforced insulation for inverter operation > 500 V AC

Standard insulation
The operation of an AC asynchronous motor with a frequency inverter places a much
greater load on the winding than in the case of non-controlled operation.
The inverters pulse the DC voltage of the DC link (Uz) to the supply cables to the motor. This pulsing takes place in the kHz range, which means several thousand ON and
OFF switchings per second – at SEW-EURODRIVE usually with 4, 8, 16 kHz.

The standard windings of the motors are constructed with copper wires and surface
insulating materials, which can easily withstand the voltage peaks specified below.
•

Line-to-line voltages ULL = 1560 V

•

Line-to-ground voltages ULG = 1100 V

The DR. motors can therefore be used with the normal winding on frequency inverters
with up to 500 V.
If a DR. motor is operated with a frequency inverter supplied with 600 V or 690 V, or
the DC link voltage of which is raised to over 742.5 V DC, the double voltage pulse
can exceed the maximum permissible value of the standard winding of 1560 V.
Design measures must therefore be taken to protect the motor from these high voltages.
Reinforced insulation (/RI)
The electric strength of the winding insulation is achieved by reinforcing the coat thickness of the inner layer for the copper wires.
This insulating system for motors carries the type and catalog designation /RI.
The standard surface insulating materials are sufficient for line-to-line and line-toground insulation.
The RI windings of the motors withstand voltage peaks of up to
•

Line-to-line voltages ULL = 1800 V

•

Line-to-ground voltages ULG = 1250 V

19290411/EN – 10/2014

See also chapter "DR.. AC motors on non-SEW inverters" (→ 2 198).

Catalog – AC Motors DR.71 - 315, DT56, DR63

191

Drive selection
Drive selection – controlled motor

Reinforced insulation with increased resistance against partial discharge (/RI2)
If the voltage peaks exceed the 1800 V threshold, enameled wires with higher resistance against partial discharge must be used. This higher resistance is achieved by the
addition of inorganic additives to the coating of the inner layer.
The standard surface insulating materials for line-to-line and line-to-ground separation
are also no longer sufficient. To protect against these very high voltages, thicker surface insulating materials and enhanced impregnation must be used.
This insulating system for DR.. motors carries the type and catalog designation /RI2.
The RI2 windings of the DR.. motors easily withstand voltage peaks of up to
•

Line-to-line voltages ULL = 2150 V

•

Line-to-ground voltages ULG = 1800 V

See also chapter "DR.. AC motors on non-SEW inverters" (→ 2 198).
6.15.7

Limit characteristic curves of the motors in inverter operation
The thermal curves for the asynchronous AC motors of the DR.. series are distinguished with regard to their energy efficiency class.
The asynchronous servomotors are distinguished according to their speed class.

Thermally permitted torques – DRS.. motors
When DRS.. motors are used with inverters, the thermally permitted torque must be
observed during the drive selection. The following factors determine the thermally permitted torque:
•

Energy efficiency class: none or IE1

•

Operating mode

•

Type of cooling: Self-cooling or forced cooling

•

Base frequency: fbase = 50 Hz (400 V W) or fbase = 87 Hz (400 V m)

You can determine the thermally permitted torque on the basis of torque limit curves.
The effective torque calculated during project planning must be below the limit curve
with regard to the mean speed.
Below are the limit curves for 4-pole DRS.. motors with the following line frequencies:
•

fbase = 50 Hz

•

fbase = 87 Hz

The following conditions apply to the shown limit curves:
Motor in duty type S1 on 50 Hz supply system

•

Line voltage of motor 230 V m / 400 V W or corresponding voltage range

•

Supply voltage of the inverter Uline = 3 × 400 V AC

•

Motor in thermal class 155 (F)
19290411/EN – 10/2014

•

192

Catalog – AC Motors DR.71 - 315, DT56, DR63

Drive selection
Drive selection – controlled motor

fbase = 50 Hz (400 V W, 50 Hz) – DRS.. motor
The following diagram shows the limit curves of the DRS.. motor for operation at base
frequency fbase = 50 Hz. Separate curves are provided for motors with self-cooling and
forced cooling (optional /V forced cooling fan).
200 %
180 %

[4]
160 %
140 %

[1]

[3]

[2]

M / Mn

120 %
100 %
80 %
60 %
40 %
20 %
10 %
0

300

600

900

1200 1500 1800 2100 2400 2700 3000 3300 3600 3900

min -1
9007208204121099

S1 operation with self-cooling (= without optional forced cooling fan)

[2]

S1 operation with self-cooling (= without optional forced cooling fan) for
DRS280M4

[3]

S1 operation with forced cooling (= with optional forced cooling fan)

[4]

Mechanical limitations for gearmotors

19290411/EN – 10/2014

[1]

Catalog – AC Motors DR.71 - 315, DT56, DR63

193

Drive selection
Drive selection – controlled motor

fbase = 87 Hz (400 V m, 50 Hz) – DRS.. motor
The following diagram shows the limit curves of the DRS.. motor for operation at base
frequency fbase = 87 Hz. Separate curves are provided for motors with self-cooling and
forced cooling (optional /V forced cooling fan).
200 %
180 %
[5]
160 %
140 %
[1]

[4]

[2]

[3]

M / Mn

120 %
100 %
80 %
60 %
40 %
20 %
10 %
0

300

600

900

1200 1500 1800 2100 2400 2700 3000 3300 3600 3900

min -1
9007208204123531

[1]

S1 operation with self-cooling (= without optional forced cooling fan)

[2]

S1 operation with self-cooling (= without optional forced cooling fan) for
DRS280M4

[3]

S1 operation with forced cooling (= with optional forced cooling fan) for DRS250
– 315

[4]

S1 operation with forced cooling (= with optional forced cooling fan)

[5]

Mechanical limitations for gearmotors

Thermally permitted torques – DRE.. and DRP.. motors

•

Energy efficiency class: IE2 or IE3

•

Operating mode

•

Type of cooling: Self-cooling or forced cooling

•

Base frequency: fbase = 50 Hz (400 V W) or fbase = 87 Hz (400 V m)

Due to the lower thermal load of the IE2/IE3 design, the nominal torque of the motor
on the supply system can be subjected to a constant load down to approx 20 Hz.
The thermally permitted torque is determined on the basis of torque limit curves. The
effective torque calculated during project planning must be below the limit curve with
regard to the mean speed.

194

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

When DRE.. or DRP.. motors are used with inverters, the thermally permitted torque
must be observed during the drive selection. The following factors determine the thermally permitted torque:

Drive selection
Drive selection – controlled motor

Below are the limit curves for 4-pole DRE.. and DRP.. motors with the following line
frequencies:
•

fbase = 50 Hz

•

fbase = 87 Hz

The following conditions apply to the shown limit curves:
•

Motor in duty type S1 on 50 Hz supply system

•

Line voltage of motor 230 V m / 400 V W or corresponding voltage range

•

Supply voltage of the inverter Uline = 3 × 400 V AC

•

Motor in thermal class 155 (F)

fbase = 50 Hz (400 V W , 50 Hz) – DRE.. and DRP.. motor
The following diagram shows the limit curves of the DRE.. / DRP.. motors for operation at base frequency fbase = 50 Hz, star connection "W" at 400 V. Separate curves are
provided for motors with self-cooling and forced cooling (optional /V forced cooling
fan).
200 %
180 %
[4]
160 %
[3]

140 %

[1]

[2]

M / Mn

120 %
100 %
80 %
60 %
40 %
20 %
10 %
0

300

600

900

1200 1500 1800 2100 2400 2700 3000 3300 3600 3900

min -1

19290411/EN – 10/2014

9007208204127243

[1]

S1 operation with self-cooling (= without optional forced cooling fan)

[2]

S1 operation with self-cooling (= without optional forced cooling fan) for
DRE280M4

[3]

S1 operation with forced cooling (= with optional forced cooling fan)

[4]

Mechanical limitations for gearmotors

Catalog – AC Motors DR.71 - 315, DT56, DR63

195

Drive selection
Drive selection – controlled motor

fbase = 87 Hz (400 V m , 50 Hz) – DRE.. and DRP.. motor
The following diagram shows the limit curves of the DRE.. / DRP.. motors for operation at base frequency fbase = 87 Hz, delta connection "m" at 400 V. Separate curves
are provided for motors with self-cooling and forced cooling (optional /V forced cooling
fan).
200 %
180 %
[5]
160 %

[4]

140 %

[2]

[1]

[3]

M / Mn

120 %
100 %
80 %
60 %
40 %
20 %
10 %
0

300

600

900

1200 1500 1800 2100 2400 2700 3000 3300 3600 3900

min -1
9007208204180875

[1]

S1 operation with self-cooling (= without optional forced cooling fan)

[2]

S1 operation with self-cooling (= without optional forced cooling fan) for
DRE280M4

[3]

S1 operation with forced cooling (= with optional forced cooling fan) for DRE250
– 315

[4]

S1 operation with forced cooling (= with optional forced cooling fan)

[5]

Mechanical limitations for gearmotors

Thermally permitted torques – DRL.. motor

•

Type of cooling: Self-cooling or forced cooling

•

Speed class

The thermally permitted torque is determined on the basis of torque limit curves. The
effective torque calculated during project planning must be below the limit curve with
regard to the mean speed. The limit curves for the 4-pole asynchronous DRL.. servomotors in the following speed classes are provided in the manual "AC motors – inverter assignments and characteristic curves":

196

•

1200 rpm (corresponds to fbase of approx. 41 – 43 Hz)

•

1700 rpm (corresponds to fbase of approx. 58 – 61 Hz)

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

When asynchronous DRL.. servomotors are used with inverters, the thermally and dynamically permitted torque must be observed during the drive selection. The following
factors determine the thermally permitted torque:

Drive selection
Drive selection – controlled motor

•

2100 rpm (corresponds to fbase of approx. 72 – 76 Hz)

•

3000 rpm (corresponds to fbase of approx. 102 – 108 Hz)

The dynamically permitted torque is limited by the following:
•

The mechanical limit value according to dynamics package D1 or D2, which is independent of the selected speed class

•

The dynamic maximum and temporary current of the inverter

The following conditions apply to the basic limit curves shown:
•

DRL.. motor according to technical data, see chapter "Asynchronous DRL.. servomotors" (→ 2 117)

•

Supply voltage of the inverter Uline = 3 × 400 V AC

•

/TF thermal motor protection

The potential dynamics of the inverter and motor are illustrated by the diagram for
150% current of the inverter, while the thermal limit for the inverter and motor is shown
in the diagram for 100% current of the inverter.

19290411/EN – 10/2014

A separate overview of all limit curves is provided in the manual "AC motors – inverter
assignments and characteristic curves".

Catalog – AC Motors DR.71 - 315, DT56, DR63

197

Drive selection
Drive selection – controlled motor

6.15.8

DR.. AC motors on non-SEW inverters
In the case of inverter-supplied motors, you must adhere to the wiring instructions issued by the inverter manufacturer. It is essential to observe the operating instructions
for the frequency inverter.

U LL [kV]

Operating SEW motors on non-SEW frequency inverters is permitted if the pulse voltages at the motor terminals indicated in the following figure are not exceeded.
2.2

[8]

1.8

[1]
2.0

[2]

[3]
1.6
[4]
1.4
[5]
1.2

[6]

1.0
0.8
0.6
0

0.2

0.4

0.6

0.8

1.2

1.4
[µs]

[7]

9007203235332235

[1]

Permitted pulse voltage for motors with reinforced insulation and increased resistance against partial discharge (/RI2)

[2]

Permitted pulse voltage for motors with reinforced insulation (/RI)

[3]

Permitted pulse voltage according to NEMA MG1 part 31, UN ≤ 500 V

[4]

Permitted pulse voltage according to IEC 60034-25, limit value curve A for nominal voltage UN ≤ 500 V, star connection

[5]

Permitted pulse voltage according to IEC 60034-25, limit value curve A for nominal voltage UN ≤ 500 V, delta connection

[6]

Permitted pulse voltage according to IEC 60034-17

[7]

Duration of voltage increase

[8]

Permitted pulse voltage

INFORMATION
•

The supply voltage level at the non-SEW inverter

•

The threshold of the brake chopper voltage

•

The operating mode of the motor (motoring/regenerative operation)

→ If the permitted pulse voltage is exceeded, limiting measures, such as filters,
chokes, or special motor cables must be used. Contact the manufacturer of the
frequency inverter for more information.

198

Catalog – AC Motors DR.71 - 315, DT56, DR63

19290411/EN – 10/2014

Compliance with the limit values must be checked and taken into account as follows:

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