Product Description:

The MST450D-0012-FT-N0SN-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. It is a frameless direct-drive unit that mounts the rotor inside the customer machine and fixes the stator to the housing, supplying high continuous torque without a gearbox. This arrangement provides precise low-speed rotation for indexing tables, extruders, and similar motion axes found in automated assembly lines and process machinery, where eliminating mechanical backlash improves product quality and reduces maintenance.

During continuous operation, the stator draws a rated phase current of 33 A and develops a mechanical output of 10.2 kW while turning at its rated speed of 120 rpm. Because the electromagnetic design yields a torque constant of 24.50 Nm/A, the drive controller can estimate developed torque directly from measured current, simplifying closed-loop regulation. A voltage constant of 1.480 V/rpm corresponds to the back EMF that appears at the terminals and sets the required DC-bus voltage for the selected speed range. The stator winding presents 1.35 Ω of resistance and 12.7 mH of inductance, parameters that influence current ripple, field-oriented control bandwidth, and inverter switching frequency.

For intermittent peaks, the winding can accept 100 A, allowing acceleration up to the mechanical ceiling of 250 rpm without saturation. Heat generated at these overload points is removed through liquid cooling channels molded into the stator lamination stack, and thermal encapsulation secures the coil pack against vibration. The stator itself weighs 38.7 kg, so mounting flanges must support that mass plus process loads. Power is supplied through a 6.0 mm² lead that exits on the stator side, and an overall cable diameter of 18.5 mm fits standard conduit glands. No encoder is integrated, permitting the machine designer to select an external feedback device appropriate for the required positioning accuracy.