MST450B-0012-FT-N2SN-NNNN Bosch Rexroth Indramat
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MPN: R911384656
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The Bosch Rexroth Indramat MST450B-0012-FT-N2SN-NNNN is part of the MST Synchronous Torque Motors series and has a rated torque of 540 Newton meters at a rated speed of 120 rpm. This motor features a stator mass of 31 kilograms, a torque constant of 24.55 Nm per Ampere, and a maximum speed of 250 rpm. It requires a coolant flow of 6.0 liters per minute and handles a rated current of 22 Amps.
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Product Description:
The MST450B-0012-FT-N2SN-NNNN torque motor is built by Bosch Rexroth Indramat and belongs to the MST Synchronous Torque Motors series. This frameless stator and rotor set is intended for direct-drive applications, supplying high continuous torque at low rotational speed so mechanical reducers are unnecessary. Within automated production cells, the unit couples directly to rotary tables, extrusion screws, or roll winders to improve positioning accuracy and minimize drivetrain backlash. Because the motor is integrated directly into the machine axis, it also helps reduce wear points that would otherwise come from couplings, belts, or gear stages.
During continuous operation, the motor produces 540.0 Nm at a controlled 120 rpm. This operating point corresponds to a mechanical output of 6.80 kW while drawing a nominal phase current of 22.0 A. The electromagnetic design provides a torque constant of 24.55 Nm/A, so commanded current is translated into predictable torque for closed-loop motion control. A phase inductance of 19 mH and a cold winding resistance of 1.48 ohm influence current rise and copper losses under inverter operation. The back EMF increases in proportion to speed, which helps the drive match motor voltage demand across the usable operating range. Thirty pole pairs support high torque density and smooth low-speed rotation without external gearing.
For intermittent cycles, the drive can reach a peak torque of 1200.0 Nm while the motor remains within its stated current capability and a top mechanical speed of 250 rpm. To keep winding temperature stable under elevated load, the liquid-cooling circuit must provide 6.0 l/min of flow at the motor. Heat generated in the stator is transferred into the coolant, which makes the thermal path an important part of reliable operation in slow-speed, high-torque duty. The assembly also adds substantial mass to the machine structure, so the mounting surface and surrounding axis components must support the motor securely during acceleration and reversing motion.
