Product Description:

Bosch Rexroth Indramat manufactures the MST450D-0006-FT-N0SN-NNNN, a stator unit in the MST Synchronous Torque Motors series. As a torque motor, it mounts directly to machine axes to deliver high stall torque without gear reduction, making it suitable for rotary tables, extruders, and other low-speed drives in industrial automation. The product is intended for liquid-cooled machine sections and is supplied as an encapsulated, frameless stator that works with a separate rotor to form a complete direct-drive assembly. Because the stator is frameless, the surrounding machine structure must provide the mechanical support and alignment needed for stable operation.

The stator is liquid cooled through an internal jacket, enabling it to sustain a rated output of 5.1 kW while turning at 60 rpm. At this operating point, it produces a continuous torque of 810 Nm with a phase current of 18.8 A. The open construction has an IP00 rating, so the surrounding machine housing must provide protection against accidental contact and contamination. An outer diameter of 480 mm provides space for a large laminated core and substantial winding cross-sections. Thermal encapsulation fills voids around the coils to improve heat transfer to the coolant, which helps stabilize winding temperature during continuous operation. Power enters through a stator-side cable with a small outer diameter, and no motor feedback device is integrated, so position or speed sensing must be supplied externally.

The winding can accept momentary line currents up to 50 A, allowing the motor to reach a peak torque of 1800 Nm during acceleration or when the load changes suddenly. Despite the high electromagnetic force density, the stator weighs 38.7 kg, which helps simplify handling during installation. A 2.5 mm² power conductor is specified to match the rated current and limit resistive losses over the cable length. Because the design excludes feedback electronics, the external drive controller must handle temperature supervision and phase monitoring to help prevent overcurrent and loss of synchronization. This arrangement places more responsibility on the drive system, but it also leaves the motor assembly compact and free of onboard sensor hardware.