Product Description:

The MST450D-0006-FT-N2CS-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a frameless stator assembly for direct-drive rotary tables and extruders, it delivers high continuous torque at very low shaft speeds, allowing the machine to operate without a gearbox and with reduced backlash. Used in industrial automation platforms that require smooth startup forces, the unit mounts directly to large-diameter shafts and interfaces with Rexroth drives for closed-loop motion control. This layout also helps improve positioning accuracy because torque is applied directly to the driven axis.

During continuous operation, the stator delivers a rated load of 810 Nm while turning at 60 rpm. These operating values correspond to 5.10 kW of mechanical power. Supplying that load requires 18.8 A, and additional current increases torque according to the 43.08 Nm/A torque constant. Internal copper losses reach 4.00 kW and must be removed through the housing. Electrical data include a winding resistance of 3.95 Ω at 20 °C and a voltage constant of 2.830 V/rpm, both of which affect drive sizing and back-EMF limits. The laminated core weighs 38.7 kg, and the coils present 14.5 nF of leakage capacitance, which affects common-mode filtering.

Transient demands are handled with a peak torque of 1800 Nm and up to 50.0 A of stator current, providing headroom for rapid indexing or disturbance rejection. Magnetic energy storage in the coils is characterized by a winding inductance of 31 mH, which shapes current rise time and affects drive response settings. Thermal exchange is supported by an open cooling jacket that circulates process fluid through a 0.48 L duct system formed in the stator yoke. Maintaining flow through this circuit helps keep copper temperatures below insulation limits during sustained low-speed, high-torque operation. The motor does not require external fans for normal heat removal when the cooling circuit is used as intended.