Product Description:

The MST450D-0006-FT-N0CS-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a frameless stator assembly intended for direct-drive rotary positioning stages, it delivers large continuous torque at very low shaft speed, removing the need for mechanical gear reduction. By mounting the stator around a matching rotor, machine builders obtain smooth, single-turn positioning with absolute feedback and minimal backlash, which is important for indexing tables, printing cylinders, and similar automation axes that demand precise low-speed rotation.

Under nominal operating conditions, the motor supplies a continuous shaft load of 810 Nm at a rated speed of 60 rpm, producing 5.10 kW of mechanical power while drawing a steady phase current of 18.8 A. The electromagnetic design yields a torque constant of 43.08 Nm/A, allowing the drive amplifier to predict torque output from instantaneous current feedback. Twenty-nine conductive slots support 30 pole pairs, shaping the sinusoidal flux needed for smooth motion. Electrical dynamics are influenced by a 31 mH winding inductance, a 3.95 Ω phase resistance measured at 20 °C, and a back-EMF constant of 2.830 V/rpm, which align the motor with medium-voltage, low-frequency converters.

In intermittent duty, the machine can withstand peaks up to 1800 Nm, supported by a surge current ceiling of 50.0 A from the inverter. These bursts generate additional copper and iron losses, so the liquid jacket must move 6.0 L/min of coolant while observing a maximum inlet pressure of 3.0 bar to remove the specified 4.00 kW of heat. The laminated stator weighs 38.7 kg, providing thermal mass that slows temperature rise during load transients. When integrated with a matching rotor, the assembly supports direct-drive motion without backlash from mechanical transmission components.