Product Description:

The MSK050C-0300-NN-S3-UG0-NNNN is a synchronous servo motor produced by Bosch Rexroth Indramat for the MSK IndraDyn S Synchronous Motors series. It has size 050, length C, and winding code 0300, which give it a consistent mechanical envelope and electrical profile for medium-torque axes. Within an automation cell, this motor supplies precise closed-loop rotary motion for positioning tables, tool spindles, or pick-and-place actuators. Closed-loop operation lets the connected drive correct speed and position deviations as load conditions change during indexing or continuous motion.

The motor relies on natural convection to remove heat, so no fan or liquid circuit is needed; mounting space must allow free airflow to keep the stator below its thermal limit. This cooling method keeps the housing simpler and avoids the added maintenance of auxiliary cooling hardware. Its housing carries an IP65 rating, which blocks dust and low-pressure water jets so the unit can be installed on open machine frames. Continuous service is specified for ambient temperatures from 0 to 40 °C, and operation outside that range can shorten bearing and insulation life. The windings use thermal class 155 insulation, permitting internal copper temperatures up to 155 °C before degradation starts. The motor has a plain shaft with no keyway, which simplifies coupling to backlash-free clamp hubs and reduces shaft-end vibration.

Position feedback is transmitted through a Hiperface serial interface that pairs with Rexroth drive controllers for single-cable technology. That interface carries the position information needed for startup commutation and accurate tracking during speed changes. The capacitive sensor produces 16 signal periods per revolution, and after interpolation the drive attains high-resolution commutation and position control. Its sensing element is capacitive, which provides immunity to magnetic stray fields and supports stable accuracy over the service life. This model ships without a holding brake, so any load-holding or emergency-stop torque must be supplied by external mechanics or by the drive’s dynamic braking function.