Product Description:

The MST530R-0011-FT-N0CN-D303 is a synchronous torque motor in the MST Synchronous Torque Motors series from Bosch Rexroth Indramat. The unit is intended for direct-drive rotary axes that need high continuous torque at very low rotational speeds, eliminating gear stages and lowering maintenance in industrial automation equipment such as plastic extruders, printing drums, and indexing tables. By placing windings around a large-diameter stator and using permanent magnets on the rotor, the motor converts servo-drive current into smooth constant torque. This direct-drive layout reduces backlash and improves positional smoothness in slow rotary motion.

A closed coolant jacket supplies liquid cooling, and thermally conductive encapsulation transfers heat from the copper to the fluid. Under nominal operating conditions, the motor delivers 43.5 kW while running at 110 rpm, drawing 104.7 A from the inverter. The electromagnetic stack tolerates up to 339 A for short periods, permitting a peak torque of 8460 Nm during acceleration or process upset. Maintaining the temperature margin requires a coolant flow of 16.1 l/min through the jacket. Two parallel 2 × 16 mm² power leads carry the phase current with acceptable losses and let the terminals stay within their temperature limits. The liquid circuit also allows installation in sealed machine frames where airflow is restricted.

Static performance figures support holding and low-speed index tasks. At zero speed, the motor can produce 4320 Nm of standstill torque without exceeding the thermal model. Continuous duty is specified at 3780 Nm, a value set by magnetic loading and housing surface area. Torque per ampere is governed by a constant of 36.1 Nm/A, and the back EMF rises with speed at 4.139 V/min. Current-loop tuning can reference the 5.5 mH phase inductance, while resistive losses follow the 0.397 Ω winding resistance.