MRS272D-2N-0125-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS272D-2N-0125-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features an open kit motor design with permanent magnets. It provides a radial attractive force of 6880 Newtons, an axial attractive force of 570 Newtons, and offers IP00 protection. The motor is connected via a connection cable and is designed with a step interference fit.
Internal Product Review
The MRS272D-2N-0125-NNNN is an open synchronous kit motor built with permanent magnets for precise spindle applications. IP00 protection and a connection cable interface support clean integration into enclosed machine designs. Strong mechanical capability, highlighted by 6880 N radial attractive force, makes this model an excellent fit for demanding motion systems.
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Product Description:
The MRS272D-2N-0125-NNNN is an IndraDyn H synchronous motor kit produced by Bosch Rexroth Indramat for direct integration into machine spindles and rotary tables. Supplied as an open stator and rotor assembly, it belongs to the MRS Synchronous IndraDyn H Motors series and provides electromagnetic torque without a conventional housing, allowing equipment designers to minimize mass and inertia while retaining accurate servo performance in industrial automation. The kit format suits applications where the surrounding machine structure provides the support and alignment needed by the motor elements.
An important mechanical parameter is the axial attractive force of 570 N, a preload that the machine structure must absorb along the shaft axis. Radially, the magnetic circuit exerts a much higher radial attractive force of 6880 N, so bearings and housing shoulders need sufficient stiffness. The unit carries an IP00 degree of protection because the stator windings and rotor interact in an unenclosed workspace, so the surrounding spindle housing must provide environmental sealing. The open kit motor design also simplifies coolant routing and shortens the torque path. Torque is generated by rare-earth permanent magnets bonded to the rotor core, eliminating field-winding losses and supporting high-speed operation.
Thermal stability is supported by a 300 °C demagnetization temperature, and below this point the magnets retain full flux density. Short-term thermal excursions are limited to a 30 min demagnetization time, after which continuous exposure could weaken magnetization. Before spindle start-up, the coolant circuit must keep the motor above the –20 °C minimum spindle pre-cool temperature to avoid condensation and thermal shock. Power, sensor, and temperature leads exit through a connection cable interface that is potted into the stator slots. Assembly features include two pressure-oil screws for bearing lubrication, one seal O-ring between the motor and housing, and a step interference fit that positions the stator precisely within the spindle tube without additional brackets.
