Product Description:

The MST290B-0018-FT-N0CN-SA01 is a direct-drive synchronous torque motor produced by Bosch Rexroth Indramat and supplied within the MST Synchronous Torque Motors series. As a frameless stator-rotor set, it is intended for low-speed, high-torque applications such as indexing tables, extruders, and printing cylinders where mechanical gearboxes can be eliminated. By coupling directly to the load, it enables precise position control while minimizing backlash. It operates from a dedicated inverter and uses liquid cooling through an external circuit, allowing continuous operation inside compact machine frames.

At its continuous operating point, the motor delivers 220 Nm while turning at 180 rpm, resulting in a mechanical output of 4.10 kW. To sustain this load, the windings draw 14.8 A RMS and, with a torque constant of 14.90 Nm/A, the inverter can compute current commands directly from torque demand. Electrical behavior is further characterized by a 1.640 V/rpm voltage constant, a 34.8 mH phase inductance, and a 6.6 Ω phase resistance; these values affect current-loop bandwidth and drive sizing. With 30 pole pairs, the rotor produces high torque density at low shaft frequency, matching the direct-drive concept without mechanical reduction.

When process peaks occur, the unit can reach a shaft torque of 460 Nm while accepting up to 60.0 A from the drive, and it remains controllable up to 340 rpm, which is the electrical speed limit before back EMF approaches the drive voltage ceiling. Transient heat generated during these overloads is absorbed over a thermal time constant of 3.3 min, after which the housing must dissipate the energy; in steady state, thermal losses total 3.00 kW. Liquid cooling supports this duty cycle and requires 5.0 l/min of flow at a circuit pressure no higher than 6.0 bar to avoid seal damage.