Product Description:

The MST290F-0020-FT-N0SN-D303 torque motor is manufactured by Bosch Rexroth Indramat and belongs to the MST Synchronous Torque Motors series. It is a frameless, low-speed, high-torque rotary actuator intended for direct-drive use in industrial automation. By mounting the rotor directly on the machine shaft, the device supplies constant torque without mechanical transmission elements, making it suitable for extruders, rotary indexing tables, and similar precision axes that demand high positioning accuracy. This direct-drive layout also removes gearbox backlash and belt compliance, which helps the axis respond smoothly during low-speed positioning and continuous-process rotation.

Under continuous duty, the motor delivers a rated torque of 715 Nm at a rated speed of 265 rpm, which corresponds to a mechanical output of 19.80 kW. This operating point is reached while the stator draws a rated current of 39.9 A. For dynamic events, the winding can accept a peak current of 120.0 A, allowing the drive to reach a maximum torque of 1450 Nm for short intervals. The electromagnetic design provides a torque constant of 17.92 Nm/A, so the control electronics can estimate produced torque directly from measured phase current. A winding inductance of 10.9 mH and resistance of 1.74 Ω affect current response and influence drive loop behavior during acceleration and load changes.

Thermal management is supported by an integral water jacket that requires a coolant flow of 9.6 L/min to hold winding temperatures within limits. With this flow rate, the assembly exhibits a thermal time constant of 5.2 min, enabling quick detection of overload while still permitting brief torque surges without excessive heat rise. Liquid cooling also helps the motor maintain stable output in enclosed machine spaces where natural airflow is limited. Power leads must be sized to a cross-section of 10.0 mm² to handle the continuous current while minimizing voltage drop. The unit’s mass of 39.6 kg adds mechanical damping to the axis and assists heat absorption during load transients.