Product Description:

The MST290G-0020-FT-N0SN-D303 synchronous torque motor is built by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. Designed for direct-drive rotary tables and high-torque positioning axes, the unit delivers controlled rotation at low speed without intermediate gear reduction. By coupling directly to the load, the motor simplifies mechanical assemblies and improves accuracy in industrial automation platforms such as printing presses, extruders, and indexing drives. Its open stator construction supports liquid cooling circuits for continuous duty in tightly regulated production cells.

At its nominal operating point, the motor develops a rated torque of 810.0 Nm while turning at 260 min⁻¹, producing 22.10 kW of mechanical power. The windings carry 43.7 A under these conditions and have a resistance of 1.58 Ω at 20 °C together with an inductance of 9.9 mH. These electrical parameters affect the current-loop time constant and the voltage required from the drive. The voltage constant is 1.196 V min⁻¹, so back EMF remains modest even at peak speed and eases inverter sizing. Leakage capacitance is 28.3 nF, which influences common-mode currents toward the drive shield. A permissible temperature rise of 10 K protects insulation classified to thermal class 155.

The open-frame designation IP00 means external guarding and airflow management are required. Integrated cooling lines are rated for a maximum inlet pressure of 6.0 bar and cause only 0.1 bar of pressure drop at minimum flow. During transients, the control can demand up to 118.0 A, a limit that must be observed by the power stage to avoid demagnetization. The rotor is built with 30 pole pairs, enabling fine torque granularity. Coupled with a torque constant of 18.54 Nm/A, this supports high-resolution force control at very low speeds.