Product Description:

The MST530D-0012-FT-N0CN-NNNN is a liquid-cooled synchronous torque motor produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. This frameless stator-rotor set is intended for direct-drive rotary axes where high continuous torque at very low rotational speed is required, such as extruders, gearless presses, and indexing tables in industrial automation. It transforms electrical energy directly into shaft torque without reduction gearboxes, improving positioning stiffness and minimizing maintenance in closed-loop motion systems.

Under nominal loading, the motor delivers a rated torque of 1680 Nm at a rated speed of 120 rpm, which equates to a mechanical output of 21.10 kW. Achieving this output requires a phase rated current of 47.2 A, and during transient demand the drive may rise to a maximum current of 156.4 A to produce the peak torque of 3760 Nm. Continuous operation releases 5.40 kW of loss heat, so the windings are cooled by a 7.0 L/min coolant flow admitted at up to 6.0 bar. The stator terminals accept 10.0 mm² power conductors, and the magnetic circuit has a winding inductance of 11.91 mH and a resistance of 1.017 Ω. The voltage constant is 2.531 V/rpm, which corresponds to the back EMF seen by the inverter at the 120 rpm operating point.

When the shaft is locked, the motor produces a standstill torque of 1920 Nm with a corresponding current of 53.8 A, providing holding force for indexing devices before motion starts. Dynamic response is helped by a torque constant of 35.59 Nm/A, allowing the control loop to predict torque output from phase current. The electrical design supports a maximum electrical speed of 170 rpm, beyond which back EMF would exceed the inverter rating. Thermal saturation is delayed by a time constant of 8.3 min, giving the system a short reserve for process upsets before coolant temperature must recover.