Product Description:

The MST161E-0140-FT-N0CN-D303 torque motor is produced by Bosch Rexroth Indramat and belongs to the MST Synchronous Torque Motors series. This frameless stator-rotor set is intended for direct-drive rotary axes in automated machinery, where eliminating gearboxes improves positioning accuracy and lowers maintenance. Integrated windings, optimized pole geometry, and high-precision magnet placement allow the machine builder to fasten the motor directly to the load, creating compact motion modules for indexing tables, rotary knives, or printing cylinders in industrial automation. Because the active parts mount directly into the machine structure, the axis can operate without backlash from belts, gears, or flexible couplings.

The stator uses liquid cooling, so heat is removed through a closed fluid circuit, allowing the motor to maintain its rated torque of 95.0 Nm continuously at the rated speed of 1000 min⁻¹. Under these operating points, it draws a rated current of 32.0 A and produces a mechanical output of 9.95 kW. A standstill torque of 105 Nm is available for static holding tasks before motion begins. Thermal encapsulation around the windings improves dielectric strength and protects the 4.8 mH inductive coils against vibration. The copper paths exhibit 0.82 Ω resistance at 20 °C, and their magneto-electrical coupling is quantified by a torque constant of 3.13 Nm/A, showing the proportional relationship between phase current and generated torque.

When higher acceleration is required, the drive can deliver a peak torque of 260 Nm while the inverter supplies a maximum current of 84.0 A. Speed capability extends to 2000 min⁻¹, doubling the rated value for short-duration moves. Back electromotive force rises proportionally, and the voltage constant of 0.207 V/min⁻¹ helps the controller predict generated voltage at a given speed and adjust the PWM pattern accordingly. An AWG 10 power lead accommodates the phase conductors, and the 12.8 kg stator mass contributes thermal capacity that damps rapid temperature swings during cyclic operation.