Product Description:

The MST290G-0020-FT-N0CN-D303 torque motor is produced by Bosch Rexroth Indramat as part of the MST Synchronous Torque Motors series. This stator module is designed for direct-drive rotary axes in industrial automation, where it supplies high continuous torque at low rotational speed without the backlash associated with mechanical gearboxes. Integrating the motor windings into the machine frame allows compact layouts while maintaining the thermal path needed for liquid-cooled operation.

At its nominal operating point, the motor generates a rated torque of 810 Nm while turning at 260 rpm; this equates to a mechanical output of 22.10 kW. The electromagnetic loading that produces this output requires a continuous phase current of 43.7 A, and the windings exhibit an inductance of 9.9 mH that influences current rise time during servo control. Electrical resistance of 1.58 Ω assists in calculating I²R losses, and power is delivered through AWG 8 leads. The stator body measures 310 mm in outer diameter, spans 270 mm in axial length, and weighs 30.6 kg. A dedicated coolant channel holds 0.82 L to extract heat directly at the copper conductors and stabilize temperature during continuous duty.

For short-time demands, the design allows a peak torque of 1600 Nm when the drive can supply up to 118.0 A of phase current. Torque rises proportionally with current according to a constant of 18.54 Nm/A, a figure useful for configuring current-loop gains and estimating acceleration capability. Sustained overloads rely on liquid cooling, and the installation must deliver a flow rate of 10.0 L/min through the motor’s internal duct. This flow removes the additional copper and iron losses encountered at peak loading without exceeding insulation class limits. The combination of direct cooling, high momentary torque, and low base speed enables cycle-controlled positioning or compact extrusion drives that need large breakaway torque without adding external gear stages.