MRS182B-2N-0075-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS182B-2N-0075-NNNN is a rotor with a frame size of 182 and an iron length of 175 mm, produced as part of the MRS Synchronous IndraDyn H Motors series. This rotor features permanent magnets, a steel sleeve construction, and an internal diameter of 75 mm. It has a protection rating of IP00 and weighs 11.5 kg.
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Product Description:
The MRS182B-2N-0075-NNNN is a rotor manufactured by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. As the rotating core of a spindle-class synchronous motor, it works with a matching stator to generate torque for precision machining and other automation tasks that demand constant angular velocity. The unit has an IP00 protection rating, so the surrounding motor housing must protect it against contact and contaminants.
Its internal bore measures 75 mm, allowing the rotor to slide over a matching spindle shaft after thermal expansion. An iron stack length of 175 mm provides the active magnetic path and supports the torque range of the paired stator. The rotor has 4 pole pairs, balancing electrical frequency with mechanical speed for high-speed spindle operation. Installation uses a step interference fit; the steel sleeve is heated or the shaft is cooled to create a secure press fit without keys. Oil-pressure ports allow controlled removal, reducing the risk of mechanical damage during service. The rotor is the standard design with frame size 182 and frame length code B. Permanent magnets are bonded to a steel sleeve for radial containment during rotation.
The rotor has a mass of 11.5 kg, providing rotational inertia that damps speed ripple while permitting fast acceleration. The paired motor uses Class F insulation, which permits winding temperatures up to 155 °C during operation. The allowable ambient temperature range is 0–40 °C, helping maintain stable magnet flux density and O-ring integrity. The sealing element is made from chemically resistant FKM and has a size of 75 × 4 mm. A total rotor length of 213 mm supports the L1 dimension required for accurate spindle stack-up. The rotor bore is machined with a stepped profile that matches the selected interference-fit mounting method.
