Product Description:

The MST530D-0012-FT-N0SN-NNNN torque motor is produced by Bosch Rexroth Indramat and belongs to the MST Synchronous Torque Motors series. Designed as a frameless stator-rotor assembly, the unit delivers high continuous torque at very low shaft speed so rotary tables, extruders, or indexing drives can be connected directly without gear reduction. Its thermal encapsulation fills the winding cavities, resisting moisture ingress and stabilizing the magnetic circuit during load changes. Because the rotor and stator are integrated directly into the machine structure, the design reduces drivetrain parts that can introduce backlash, compliance, or added inertia in precision industrial automation tasks.

Thermal management is handled by liquid cooling; a coolant flow of 7.0 L/min at up to 6.0 bar inlet pressure removes losses from the stator windings, while the thermal encapsulation helps maintain an even temperature gradient. Under these conditions, the motor produces a rated torque of 1680 Nm at a rated speed of 120 rpm, which corresponds to a mechanical output of 21.10 kW. The electrical interface is situated on the stator side with a smaller outer diameter, simplifying cable routing inside compact machine frames. This placement keeps power and cooling connections near the stationary section of the axis and leaves more free space around the rotating assembly. A winding resistance of 1.017 Ω and a voltage constant of 2.531 V/rpm mean the drive electronics must supply 47.2 A of continuous current to reach the nominal operating point.

For intermittent peaks, the electromagnetic design can generate up to 3760 Nm, giving additional headroom for acceleration or short process transients beyond the 1920 Nm standstill torque. The inverter may deliver as much as 156.4 A during these overload events, and each ampere produces about 35.59 Nm/A because of the torque constant measured at 20 °C. This torque-per-amp relationship helps the drive produce predictable force at low speed, where direct-drive axes often spend much of their operating time. With a maximum electrical speed of 170 rpm, the rotor surface velocity remains moderate, which supports stable cooling conditions and smooth operation during continuous low-speed duty.