Product Description:

The MST530G-0010-FH-N0KR-NNNN is a frameless synchronous torque motor supplied by Bosch Rexroth Indramat as part of the MST Synchronous Torque Motors series. It is intended for direct-drive rotary axes where large continuous torque is required at very low speed, allowing indexing tables, plastic extruders, and gearless drum drives to operate without mechanical gear stages while still achieving precise motion control. Because the rotor couples directly to the driven axis, backlash from intermediate gearing is avoided and low-speed motion can remain smooth during positioning and process control.

Under continuous load, the motor delivers a rated torque of 4200 Nm at a rated speed of 100 rpm. This corresponds to a mechanical rated power of 44 kW. The electromagnetic design draws a rated phase current of 116.8 A, while intermittent peaks can reach a maximum current of 350 A (rms) for short acceleration bursts. Thirty-five pole pairs set the electrical frequency relationship between stator excitation and rotor position, and a torque constant of 32.70 Nm/A links phase current to developed torque for current-loop calculations. The three-phase power leads accept a cross-section of 2 × 25.0 mm², and the copper windings have 0.33 Ω resistance with 4.3 mH inductance, which influence copper loss and current ripple. A required coolant flow of 16.5 l/min passes through the integrated jacket to keep the winding within its thermal class during sustained duty.

Short-term overload capability is provided by a maximum torque of 9200 Nm, giving headroom for starting inertia-laden loads. The liquid-cooled housing measures 565 mm in diameter and 370 mm in length, so machine frames must provide matching clearance and a secure mounting surface. Environmental ingress protection is limited to IP00, which means the unit must be installed inside a sealed machine enclosure. Exposed active parts require guarding so debris and accidental contact do not reach the motor internals during operation. The total mass is 204 kg, so the surrounding structure must support the motor and its bearing arrangement without distortion.