Product Description:

The MST290D-0004-FS-N2CN-SG01 is a low-speed, high-torque electric motor produced by Bosch Rexroth Indramat for the MST Synchronous Torque Motors series. As a direct-drive component, the unit mounts directly to machine shafts and eliminates gear reducers, providing precise positioning and constant torque at crawl speeds required in indexing tables, extruders, and printing cylinders within industrial automation. By integrating permanent-magnet excitation with liquid heat removal, the motor delivers continuous torque output while keeping winding temperatures within the permissible thermal range.

The motor’s cooling circuit uses liquid cooling, so heat is carried away by circulating coolant rather than ambient airflow. This permits continuous operation in enclosed machine frames without derating. Under rated conditions, the stator draws a phase current of 10.4 A and produces a continuous shaft output of 350 Nm. At a rated mechanical speed of 45 rpm, this torque corresponds to an output of 1.65 kW. Because torque is available at very low rotational speed, the drive can move heavy loads directly, and speed regulation remains stable because the synchronous design locks rotor position to stator frequency.

Dynamic headroom is provided through a peak capability of 700 Nm that can be supplied briefly to accelerate the load or overcome breakaway friction. During such transients, the inverter may command up to 30 A of phase current, which is three times the thermal rating. Rotational responsiveness is influenced by the rotor’s moment of inertia, listed at 0.11 kgm². Power for the motor is derived from a DC link nominally set to 540 VDC, which provides adequate voltage headroom for back EMF at the specified peak conditions while keeping semiconductor stresses within the drive’s standard class ratings.