Product Description:

The MST450D-0006-FT-NZCD-N305 torque motor is produced by Bosch Rexroth Indramat and belongs to the MST Synchronous Torque Motors series. This frameless stator section is intended for direct-drive installations where high continuous torque at low rotational speed is required, such as rotary tables, extruders, or printing cylinders. Liquid cooling and thermo-encapsulation enable the unit to sustain its thermal limits while delivering constant torque in closed-loop servo systems.

At a maximum supply current of 50.0 A, the stator can draw short-term current to overcome breakaway loads without overheating. This current reserve supports the peak torque rating of 1800.0 Nm, giving the axis ample starting and acceleration capability. The magnetic circuit uses 30 pole pairs, so full torque is available at very low electrical frequency, which supports accurate positioning. Power conductors with a cross-section of 6.0 mm² are required to handle the permissible RMS current without excess voltage drop. During continuous duty, the motor maintains thermal equilibrium at a rated current of 18.8 A, which provides a stable reference point for drive selection.

With coolant circulating through integrated channels, the winding can sustain a shaft output of 5.10 kW while running at the rated mechanical speed of 60 rpm. At this operating point, the electromagnetic design supplies a continuous torque of 810.0 Nm. This output aligns with the 43.08 Nm/A torque constant and keeps copper losses within acceptable limits with a 3.95 Ω phase resistance. The stator assembly weighs 38.7 kg, which affects bearing preload and machine inertia budgets. Combined with a 31 mH phase inductance and a back-EMF gradient of 2.830 V/rpm, the motor can be driven by standard inverters without exceeding DC-bus voltage. Thermo-encapsulation protects the windings from vibration-induced fatigue and improves heat transfer to the liquid jacket.