ESR Pollmeier GmbH
Servo Drive Technology

Torque motors

In applications with high torques at low speeds, ESR torque motors are often a good alternative to geared motors or motor-gear box combinations. These direct drives have a higher stiffness and position accuracy compared to solutions with gear boxes. The lack of parts with backlash and friction results in longer lifetime and reduced wear and tear.

Depending on the design type, the torque motors with integrated bearing can be used directly as rotary table or can be built into the machine as easy as a conventional servo motor. Alternatively, we provide torque motors as a kit with separate stator and rotor.

Characteristics of the torque motors

  • Torques of up to 600 Nm and more, peak up to 1,400 Nm
  • highest stiffness of the drive system at particularly compact size
  • maintenance-free, since brushless
  • high dynamics and accuracy due to optical encoders, optional low-priced magnetical position sensors (single- or multiturn)
  • high power density through rotor with rare earth magnets
  • available ready for installation as flange motors with full shaft, hollow shaft, or pad-type flange; as complete rotary tables, or as motor assembly without bearings
  • easy connection of motor and encoder using connectors
  • self-cooling, on request cooling through external fan motor
  • holding brake optional
Data sheet 6700.174 – MH 4 torque motors (in German)

Torque motor family MH 11 MH 41 MH 42 MH 81
Motor type synchronuous torque motor synchronuous torque motor synchronuous torque motor synchronuous torque motor
Design type rotary table flange motor, round flange motor, squared motor assembly without bearings *
Degree of protection IP 65 IP 65 IP 54 (without housing) – (assembly)
Flange size Ø200 .. Ø300 mm Ø200 .. Ø300 mm 140 .. 250 mm Ø140 .. Ø660 mm **
Hollow shaft inner diameter Ø50 .. Ø104 mm Ø30 .. Ø40 mm Ø30 .. Ø40 mm Ø60 .. Ø448 mm **
Rated speed 120 .. 700 r.p.m. 250 .. 500 r.p.m. 250 .. 500 r.p.m. 120 .. 400 r.p.m.
Max. speed up to 1500 r.p.m. on request on request
Rated torque 10 .. 150 Nm 12 .. 240 Nm 14 .. 272 Nm 5 .. 670 Nm
Peak torque 25 .. 380 Nm 36 .. 720 Nm 42 .. 816 Nm 12 .. 1430 Nm
Shaft power 0.7 .. 3.9 kW 0.6 .. 6.3 kW 0.7 .. 7.1 kW 0.2 .. 13.3 kW
Data sheet on request 6700.174 (German) 6700.174 (German) on request
Matching servo drives TrioDrive D/xSMidiDrive D/xS, Multi-axis servo system

* Also available as ready-for-use rotary table.
** Outer diameter of the stator or inner diameter of the rotor, respectively

Further information is given in the individual data sheets which can also be sent to your company address by request.
Just drop a line or give us a call: e-mail:, tel: +49 6167 9306-0.

ESR. The Dynamic Solution
© 2000–2019 ESR Pollmeier GmbH – page address:
The statements on this web page are for information, only. They do not guarantee properties. We reserve the right to make changes without notice. Errors excepted.