MRS102B-1N-0046-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS102B-1N-0046-NNNN is a rotor component from the MRS Synchronous IndraDyn H Motors series with a frame size of 102 and an overall length of 136 millimeters. It has a rotor mass of 2.5 kilograms, a rotor inertia of 0.003 kg·m², and features a smooth bore design with 12 M5 balancing threads. The rotor includes three pole pairs and comes with an IP00 protection code.
Internal Product Review
The MRS102B-1N-0046-NNNN is a precision rotor with a smooth-hole bore design. The 46 H5 center bore and 0.003 kg·m² rotor inertia support accurate fit-up and responsive dynamic behavior in servo assemblies. IP00 construction and 3 pole pairs make this unit a strong technical choice for integrated motor builds.
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Product Description:
The MRS102B-1N-0046-NNNN is a rotor manufactured by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. As the rotating core of a synchronous motor, this component couples the electromagnetic field generated by the stator to mechanical motion delivered to connected machinery. In industrial automation, a matched rotor enables precise speed regulation and torque generation for indexing tables, feeders, and other servo-controlled axes.
This rotor is built around a frame size of 102, providing a reference for compatible stators and housings. Its overall stack length measures 136 mm, and the outside diameter is 74 mm; together these dimensions set the rotor envelope inside the motor casing. A center bore machined to 46 H5 tolerance provides accurate seating on the shaft, while the smooth-hole design avoids keyways that could concentrate stress. Dynamic balancing is supported by the inclusion of 12 x M5 threaded holes, so correction weights can be added without further machining. The rotor carries three embedded permanent-magnet pole pairs, supporting synchronous operation at electrical frequencies proportional to commanded speed.
A rotor mass of 2.5 kg keeps centrifugal forces manageable, while the moment of inertia is only 0.003 kg·m², allowing fast acceleration and deceleration in positioning tasks. With 3 pole pairs, the rotor reaches nominal speed at a lower electrical frequency, which helps reduce switching losses in the drive. The assembly is supplied without its own enclosure and therefore carries a protection rating of IP00, meaning it must be installed inside a motor housing that provides environmental sealing. The smooth bore and open construction require a matching shaft fit and a separate motor housing in the finished assembly.
