Product Description:

The MST530L-0006-FH-N0KR-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. As a direct-drive rotary unit, it delivers high continuous torque at low shaft speed, making it suitable for indexing tables, tire winders, and other automation axes that benefit from gearless transmission. The high pole-count rotor also supports direct-drive positioning with minimal cogging during low-speed motion.

At the nominal operating point, the motor produces 6300 Nm of rated torque while turning at 60 rpm, resulting in 39.60 kW of rated power at the shaft. To sustain this output, it draws 120.0 A of rated current from the inverter and circulates coolant at 16.5 l/min through its embedded channels; the pressure drop across the circuit is 0.2 bar. The motor uses thirty-five pole pairs, which set the electrical frequency seen by the drive controller and favor smooth torque production at very low speed. Thermal losses at the rated point reach 11.50 kW, so the specified coolant flow keeps the winding temperature within limits. Connection to the power bus requires two 25.0 mm² conductors, and the phase windings have 0.63 Ω of resistance and 6.4 mH of inductance, which influence current rise time and current-loop tuning.

For short duty cycles, the motor can reach 13800 Nm of maximum torque when energized with up to 380.0 A of peak current. The electromagnetic design provides a 52.50 Nm/A torque constant, which permits large torque steps with moderate current resolution, while the back EMF follows a 3.350 V/rpm voltage constant that the drive must accommodate during regenerative events. Transient operation is limited by the thermal capacity of the windings and by maintained coolant flow, which helps prevent insulation overstress. Generous conductor area also limits copper heating during aggressive acceleration sequences.