Product Description:

The MST290E-0018-FH-N0PU-NNNN is a frameless torque motor produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. Designed to deliver direct rotary force at low speed, the unit installs into machine frames where high continuous torque and precise angular positioning are required for industrial automation tasks such as indexing tables or extruder drives. By integrating stator and rotor elements without a gearbox, the motor reduces mechanical backlash and simplifies maintenance schedules.

Under nominal operating conditions the stator maintains a rated mechanical speed of 180 rpm while sustaining a shaft load of 575 Nm. These figures combine with an electrical input of 10.8 kW and a phase demand of 35 A to set the continuous duty envelope. For each ampere supplied, electromagnetic coupling yields 16.4 Nm/A, a ratio that assists drive engineers in sizing the power stage. The back-EMF gradient is 1.037 V per rpm, so the controller must accommodate the voltage rise as speed increases. Copper losses are influenced by a winding resistance of 1.59 Ω at 20 °C, and fast current transients are shaped by a mounted rotor inductance of 9.1 mH.

In short-term overload situations the motor can reach 1150 Nm with currents up to 125 A, giving machines the headroom needed for acceleration peaks. Magnetic geometry is set with 30 pole pairs, which lowers cogging at low speed and defines the commutation angle for the drive firmware. Thermal mass is modest, the winding heats to its steady state after 3.3 min, so liquid circulation through the 0.55 l coolant duct is advisable for cyclic loads. When operated at limit, electrical and iron losses total 5.5 kW that must be removed by the cooling circuit. The 40 kg stator weight simplifies integration into compact housings while still providing the necessary structural rigidity.