31.SM.201-34CJ KEB
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The KEB 31.SM.201-34CJ is part of the SM Synchronous Servo Motors series and offers a rated power of 0.16 kW with a rated speed of 3000 rpm. This servo motor features a rated torque of 0.55 Nm, a brake holding torque of 4.5 Nm, and self-cooling. It has an axial force rating of 110 N and a lateral force rating of 390 N.
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Product Description:
The 31.SM.201-34CJ servo motor is manufactured by KEB and belongs to the SM Synchronous Servo Motors series. It is a brushless AC unit intended for closed-loop motion axes in packaging machines, pick-and-place gantries, and similar industrial equipment where precise speed and position control are required. Within automated lines, it pairs with a digital drive to convert command signals into mechanical rotation, providing a compact torque source for feeders, small conveyors, and indexing tables.
The motor is wound for a nominal electrical supply of 330 V and draws only 0.65 A at rated load, a combination that limits heat generation. At that operating point, it delivers 0.16 kW of mechanical power while turning at 3000 rpm, producing a continuous shaft torque of 0.55 Nm. The back-EMF gradient is 83.0 V/1000 rpm, allowing the drive to estimate speed accurately from the generated voltage during sensorless diagnostics. The winding has a resistance of 79.0 Ω and an inductance of 83.0 mH, which affect the current-control bandwidth of the inverter. The frame length, including the integrated brake, is 148 mm. The aluminum housing dissipates losses through self-cooling airflow without requiring an external fan.
The motor is designed to handle the loads imposed by small transmission elements. The shaft withstands axial thrust up to 110 N and lateral belt tension up to 390 N without exceeding the bearing limits. Dynamic overload is supported by a peak torque capability of 4.7 Nm. The motor can continuously sustain a static load at a stall torque of 0.70 Nm when closed-loop current limiting is active. For power-off safety, the integrated brake supplies 4.5 Nm of holding torque, preventing back-driving on vertical axes. The available force and torque margins support mounting with suitable gearheads, pulleys, and other compact transmission components.
