Product Description:

The MST530G-0006-FT-N0CN-D303 torque motor is produced by Bosch Rexroth Indramat and is part of the MST Synchronous Torque Motors series. It is a frameless synchronous unit designed to provide high torque at low speed so that rotary axes in extrusion, printing, or positioning equipment can be driven without intermediate gearboxes. Direct integration simplifies mechanical layouts and minimizes backlash. The stator is delivered as a kit that bolts to the machine frame.

At a rated operating point of 4200 Nm and 60 rpm, the motor supplies continuous mechanical output of 26.40 kW. This operating point can be sustained without exceeding insulation limits. For intermittent load peaks, the electromagnetic system can generate up to 9200 Nm, giving ample headroom for acceleration or disturbance rejection before current limiting occurs. The torque constant of 55.30 Nm/A links commanded current to developed torque, allowing the drive controller to calculate setpoints with straightforward proportional scaling. A winding inductance of 12.0 mH slows the rate of current change, which filters high-frequency ripple but demands adequate voltage overhead during rapid torque transients.

The electrical circuit is dimensioned for a maximum phase current of 240.0 A, while a resistance of 0.833 Ω at 20 °C limits steady-state copper losses and shapes the I²R heating curve. A thermal time constant of 8.3 min indicates how fast the winding temperature follows load changes, so motion profiles with frequent peaks must observe cooling intervals. Thirty-five pole pairs create fine commutation steps, and a voltage constant of 4.400 V/min⁻¹ indicates the back EMF that the inverter must overcome during braking. At zero speed, the motor can hold 4800 Nm with 83.4 A, providing secure static positioning without external clamping.