Product Description:

The MST210C-0027-FH-N0PU-NNNN torque motor is produced by Bosch Rexroth Indramat within the MST Synchronous Torque Motors series. This frameless stator assembly is intended for direct-drive tables, rotary indexers, and gear-free positioning axes where high continuous torque and precise electrical commutation are required. Because the unit is supplied as a frameless stator, it is built directly into the machine structure rather than installed as a complete housed motor. This arrangement helps reduce backlash and mechanical compliance in rotary axes that need accurate low-speed motion.

The motor can deliver a continuous shaft load of 120 Nm, which is its rated torque for steady-state operation at the stated thermal limit. Electrical input needed to maintain this output is supported by a rated power of 3.40 kW and a line draw of 13 A, working with a winding resistance of 4.9 Ω and a power-wire cross-section of 1.0 mm². A torque constant of 9.20 Nm/A shows how torque rises with current, and a back-EMF value of 0.620 V min⁻¹ at 20 °C indicates the generated voltage during motion. Dynamic current-loop behavior is influenced by a winding inductance of 28.6 mH, and the 9.5 nF discharge capacity also affects drive-controller filtering and dv/dt behavior. The stator uses an RLS1200 flange socket for mechanical mating with compatible rotor hubs.

For transient events such as rapid indexing, the motor withstands peaks up to 250 Nm, supplied by drives capable of delivering 50 A without saturation. The winding responds quickly to changing load because the thermal time constant is 3.0 min, so temperature rise tracks duty-cycle changes within a short interval. The laminated core and encapsulation bring the stator mass to 11.5 kg, which supports compact machine layouts while still providing a substantial magnetic structure for direct-drive use. This short thermal response is useful in applications with frequent starts, stops, and short dwell periods.