Product Description:

The MST450B-0012-FT-N0CN-NNNN is a frameless synchronous torque motor stator manufactured by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. Intended for direct-drive rotary axes, the unit supplies high stall torque at low rotational speeds, allowing the use of gearbox-free drive arrangements that improve positioning accuracy. Its liquid-cooled construction supports stable thermal behavior, making the motor suitable for precision machining centers, rotary tables, and automated assembly equipment where smooth, backlash-free motion is required.

During continuous operation, the stator delivers a rated torque of 540 Nm at a rated speed of 120 rpm, which corresponds to a mechanical output of 6.80 kW. At this operating point, the phase windings draw a rated current of 22.0 A, and each ampere contributes torque according to the torque constant of 24.55 Nm/A. Thirty pole pairs work with a voltage constant of 1.480 V/rpm to generate the back EMF needed for sinusoidal commutation. The electrical circuit has a winding resistance of 1.48 Ω and an inductance of 19 mH, which influence copper losses and current ripple during operation. These values give the drive the electrical and mechanical data needed for continuous operation.

When short-term demand rises, the motor can supply a maximum torque of 1200 Nm while remaining within a peak speed limit of 250 rpm. To reach that level, the drive may momentarily provide a maximum current of 70.0 A, and the winding system supports that load with a thermal time constant of 6.0 min. Liquid cooling removes heat through a flow of 6.0 l/min, and the circuit tolerates inlet pressures up to 3.0 bar without leakage. The stator has a mass of 31.0 kg, which adds heat capacity and supports rigid integration into compact machine structures.