Product Description:

The MST290E-0004-FH-N0PU-NNNN is a frameless synchronous torque motor stator produced by Bosch Rexroth Indramat for the MST Synchronous Torque Motors series. When integrated into a machine’s rotary axis, it supplies direct-drive motion at low speed and high torque, eliminating gearboxes in indexing tables, printing cylinders, or plastic-processing extruders. This design supports precise positioning because torque is generated in the stator windings and coupled directly to the load.

Under continuous operation, the stator delivers 575 Nm of torque at a rated speed of 40 rpm while drawing a rated current of 12.5 A. At this current, the electrical input is converted to a mechanical output of 2.40 kW. The torque constant is 46.00 Nm/A, which means each ampere supplied to the 30-pole-pair winding produces 46 newton-meters and allows the drive controller to predict torque from current feedback. Motor dynamics are influenced by a winding inductance of 49.5 mH, which limits current ripple and reduces control loop noise. Additional electrical data include a winding resistance of 8.2 Ω at 20 °C, a voltage constant of 3.620 V/rpm, and leakage capacitance of 21.0 nF.

For short-term overloads, the unit can reach 1150 Nm while remaining within a maximum electrical speed of 145 rpm. Heat created at these elevated loads is removed by liquid cooling, and the stator requires 9.0 l/min of flow while tolerating inlet pressures up to 6.0 bar. Its thermal time constant of 3.3 min shows that temperature responds quickly to load changes, so the duty cycle must stay within the motor’s thermal response. The laminated core and windings weigh 40.0 kg, adding substantial mass to the driven axis. The cooling circuit must maintain steady flow so heat can leave the stator during high-load operation.