Product Description:

The MST290D-0002-FT-N0RN-NNNN is a torque motor manufactured by Bosch Rexroth Indramat as part of the MST Synchronous Torque Motors series. It is intended for applications that need constant rotational force at very low speed, allowing machine builders to couple the rotor directly to turntables, winders, or indexing shafts without intermediate gearing. Thermal encapsulation surrounds the stator windings, and an aluminum cooling jacket supports closed-loop liquid circulation so continuous heat removal can occur during prolonged duty cycles.

At its continuous operating point the motor delivers 350 Nm while turning at 25 rpm; this combination equates to a mechanical output of 0.9 kW. A rated phase current of 6.3 A is required from the drive, and that current is regulated against a reference DC bus of 540 VDC. These values indicate the steady-state electrical load imposed on the inverter and the thermal load handled by the liquid jacket. Because the unit has no built-in encoder, position feedback must be supplied externally when closed-loop accuracy is required. Radial cable exit on the larger outside diameter keeps power leads clear of the mounting face, and a rotary connector provides quick disconnection when the motor is removed for service.

Transient demands can be met with a peak torque of 700 Nm, a ceiling speed of 90 rpm, and a short-term winding current of 25 A. The available moment of inertia is 0.11 kg·m², so the rotor resists speed fluctuations caused by cyclic process loads yet still accelerates within the limits of typical torque motor drives. The liquid-cooled aluminum housing prevents temperature spikes during these peaks, and thermal encapsulation blocks moisture ingress to the windings. With radial cabling and a factory-molded jacket, the motor integrates cleanly into rotary axes that must run quietly and maintain constant torque output over extended production shifts.