Product Description:

The MST531E-0006-FT-N0CN-NNNN is a low-speed, high-torque synchronous motor produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a direct-drive component, it mounts to rotary tables, extruders, or indexing heads where gearboxes are undesirable. By generating large stall torque at very low rotational velocity, the unit simplifies mechanical layouts and allows closed-loop precision positioning in industrial automation equipment.

Thermal management relies on an open cooling jacket that requires coolant flow of 10.0 l/min; the circulating liquid absorbs copper and stator losses before they influence winding temperature. The standard design variant uses an axial cable with a larger outer diameter to carry power, and there is no Hall sensor, so commutation is handled by resolver feedback from the drive. During continuous duty, the stator draws a rated current of 36.5 A, while transient peaks can reach 95.0 A to accelerate heavy inertial loads. A torque constant of 58.90 Nm/A translates these currents into shaft torque, allowing the motor to sustain a rated output torque of 2150 Nm without exceeding permissible temperature rise. Electrical dynamics are shaped by a 37.5 mH phase inductance and 2.43 Ω phase resistance, which affect current loop bandwidth and power loss.

Output characteristics focus on power, speed, and peak torque rather than only thermal limits. At a rated speed of 60 rpm, the motor delivers 13.50 kW of mechanical power, matching applications that need constant torque through slow rotation. The winding’s back-emf constant of 4.200 V/rpm sets the drive voltage required to reach higher velocities, which are capped at a maximum of 95 rpm for safe operation. For brief overload events, the electromagnetic system can produce up to 5000 Nm of torque, giving ample headroom for start-up friction or process shocks.