MRS242B-1N-0110-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS242B-1N-0110-NNNN is part of the MRS Synchronous IndraDyn H Motors series. This motor offers a rated speed of 1000 min⁻¹, a rated torque of 250 Nm, and a rated power of 26.2 kW. It features a maximum current of 180 A, crosswise inductance of 8.8 mH, and has a rotor mass of 22.5 kg.
Internal Product Review
The MRS242B-1N-0110-NNNN is a Bosch Rexroth Indramat synchronous IndraDyn H motor built for demanding servo and spindle applications. Rated output of 26.2 kW and rated torque of 250 Nm support impressive continuous performance in heavy-duty motion systems. A maximum torque of 575 Nm at a rated speed of 1000 min⁻¹ highlights excellent overload capability.
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Product Description:
The MRS242B-1N-0110-NNNN is a three-phase synchronous motor produced by Bosch Rexroth Indramat within the MRS Synchronous IndraDyn H Motors series. Designed for industrial automation axes that demand continuous low-speed torque, the unit converts drive-supplied AC into mechanical rotation through a permanent-magnet rotor. Because it is a synchronous design, the rotor follows the commanded electrical angle closely, which supports stable low-speed operation and precise speed regulation. Its electrical and mechanical parameters align with IndraDrive controllers, enabling position or velocity control in presses, extruders, and heavy material-handling equipment. The motor is suited to axes where high torque at modest speed is more important than compact high-speed operation.
At its nominal operating point, the motor reaches a rated speed of 1000 rpm and produces a rated torque of 250 Nm, which corresponds to a mechanical output of 26.2 kW. Delivering that load requires a rated current of 68 A, and the winding resistance is 0.26 Ω. The electromagnetic design uses five pole pairs, a crosswise inductance of 8.8 mH, and a longitudinal inductance of 4.5 mH to support field-oriented control. This combination helps the controller regulate magnetizing and torque-producing current separately during closed-loop operation. The motor also has a voltage constant of 310 V/1000 rpm, so the inverter must supply enough voltage to maintain shaft speed under load.
For short overloads and acceleration, the drive can supply a maximum current of 180 A, allowing the motor to reach a maximum torque of 575 Nm. The rotor mass is 22.5 kg, and the inertia is 0.119 kg·m², which helps smooth speed changes in heavy-duty axes. The motor has a torque constant of 3.68 Nm/A, which links phase current to produced torque for predictable current-to-torque response. It also has a 7.3-minute thermal time constant, so brief overloads can be applied before the winding temperature approaches steady-state conditions. That behavior is useful when the axis must accelerate heavy loads or overcome short process peaks.
