Product Description:

The MST201D-0027-FT-N0CN-D303 is a frameless synchronous torque motor stator produced by Bosch Rexroth Indramat and placed in the MST Synchronous Torque Motors series. It is intended for direct-drive rotary tables, extruders, and positioning axes where low-speed operation and high continuous torque are required. The stator works with an external drive inverter that supplies three-phase current for speed or torque control, helping the machine avoid gearbox backlash and reduce mechanical complexity. Because the unit is frameless, it is typically integrated directly into the machine structure rather than mounted as a complete housed motor.

The stator delivers rated torque of 140 Nm at a rated speed of 330 rpm, which corresponds to 4.84 kW of mechanical power. Reaching that operating point requires a rated current of 13.0 A, and a torque constant of 10.77 Nm/A gives the drive a direct relationship between phase current and produced torque. During short overload periods, the winding can generate as much as 350 Nm, which is useful for accelerating heavy rotary masses. This behavior supports rotary axes that must start, stop, or reverse under substantial inertial loads. The electrical characteristics of the winding influence current-loop response and the size of the inverter output stage.

A standstill torque of 175 Nm allows the axis to hold position without a mechanical brake when the rotor is locked. Thermal behavior is influenced by a laminated core mass of 14.6 kg, which helps slow temperature rise during continuous duty. The electromagnetic circuit supports a maximum electrical speed of 520 rpm, keeping back EMF within the voltage range of standard servo drives while leaving headroom above rated speed. That operating margin helps applications that need brief overspeed without pushing the drive beyond its normal voltage capability. The winding inductance also smooths current transitions and helps reduce torque ripple during low-speed operation.