Product Description:

The MST450D-0006-FT-N0RN-NNNN is a frameless synchronous torque motor supplied by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. This direct-drive stator is intended for industrial axes that require high continuous torque at very low shaft speeds. It removes mechanical gear stages, so position accuracy is set by the drive itself.

In continuous operation, the stator outputs 810 Nm while rotating at a rated speed of 95 rpm. That operating point is reached with a phase current of 18.1 A, allowing the inverter to size its output devices accordingly. Electrical losses under this load add up to a winding power dissipation of 4.00 kW, which the integrated liquid jacket removes through a coolant flow of 5.7 L/min. The drive section can draw mechanical power up to 8.10 kW from the machine shaft, and each ampere contributes torque at a rate of 44.47 Nm/A; this constant also indicates the back EMF seen during dynamic braking. Copper losses are influenced by a winding resistance of 3.9 Ohm at 20 °C, while an inductance of 31.0 mH shapes the motor’s electrical time constant and affects current ripple. A voltage constant of 2.500 V min⁻¹ relates rotor speed to generated back voltage during closed-loop control.

Short-term torque can rise to 2075 Nm provided the inverter limits average heating. Overcurrent protection must account for a maximum phase demand of 60.0 A. Because the unit is configured without an encoder, position sensing must come from an external feedback device. Radial cabling exits the large end of the lamination stack, identified by the RN connection code, and the cooling circuit uses the F liquid scheme. With a stator mass of 38.7 kg, the assembly has enough thermal mass to buffer transient loads while remaining suitable for compact rotary tables and indexing heads.