Product Description:

The MST210C-0027-FT-N0BN-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a direct-drive stator and rotor set, it delivers high continuous torque at low rotational speed, allowing the load or transmission element to mount directly on the motor flange. In machining centers, printing presses, or indexing tables, the motor replaces mechanical gearboxes, decreases backlash, and enables precise position control by linking the magnetic field of the stator windings directly to the driven load. Because torque is produced at the load without a gearbox, the axis can respond with less compliance and fewer mechanical transmission elements.

Under continuous duty the unit delivers 3.40 kW of shaft power while drawing a rated phase current of 13.0 A, which produces 120 Nm of steady torque without exceeding thermal limits. A torque constant of 9.20 Nm/A gives a linear relationship between drive current and mechanical output, which supports predictable closed-loop control. During rapid acceleration, the inverter may command a peak phase current of 50.0 A, enabling the motor to reach 250 Nm for short intervals. Copper and core losses at full load add up to 2.60 kW, which is useful when sizing the cooling interface and power supply.

The stator laminations weigh 11.5 kg, a mass that stores heat and works with a thermal time constant of 3.0 min to limit temperature swings during load surges. Electrical dynamics are governed by a phase inductance of 28.6 mH and a winding resistance of 4.9 Ω, which affect current rise time and steady-state copper loss. The back electromotive force is proportional to speed through a voltage constant of 0.620 V/rpm, so regenerative behavior remains predictable during deceleration. A discharge capacitance of 9.5 nF provides a parallel path for high-frequency currents and helps the drive meet conducted emission targets. These electrical characteristics also support stable current regulation during speed changes and reversing motion.