Product Description:

The MST531E-0018-FT-N0CN-D303 is a synchronous torque motor manufactured by Bosch Rexroth Indramat as part of the MST Synchronous Torque Motors series. Designed for direct-drive positioning, it attaches straight to rotary tables, extruders, or indexing axes, removing the need for gear transmissions while supplying high torque at very low speed. In automated packaging, forming, or printing lines, this construction improves accuracy, lowers maintenance, and keeps acoustic noise to a minimum by eliminating backlash and mechanical wear.

During continuous operation the motor produces a rated torque of 1800 Nm at a rated speed of 180 rpm, which results in a mechanical output of 33.93 kW. That workload is supplied by a rated current of 76.5 A flowing through 16.0 mm² power conductors, while 1.5 mm² control leads carry feedback and temperature signals. For short acceleration bursts, the inverter may deliver a standstill current of 95.6 A, and dynamic peaks can rise to 210.0 A. Each ampere contributes approximately 23.59 Nm/A of torque, a value that helps size the drive amplifier. A winding resistance of 0.45 Ω contributes to copper losses, and a coolant flow of 11.6 l/min removes the generated heat to keep the stator within permissible limits.

Applications that demand intermittent overload can reach a maximum torque of 5000 Nm without adding gear stages. The back-EMF is characterized by a voltage constant of 1.740 V/rpm, guiding the required DC-bus level for the servo drive. Electrical dynamics are influenced by a winding inductivity of 6.6 mH, which filters current ripple from the PWM inverter. The 6.0 min thermal time constant indicates how quickly the motor approaches thermal equilibrium, allowing frequent load changes without exceeding allowable temperatures.