MRS312F-2N-0160-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS312F-2N-0160-NNNN is a rotor from the MRS Synchronous IndraDyn H Motors series with a frame size of 312 and an internal diameter of 160 mm. The standard design has a step interference fit mounting style, a total length of 494 mm, and features insulation class F. It is rated for operation in ambient temperatures from 0 to 40°C and has a protection rating of IP00.
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Product Description:
The MRS312F-2N-0160-NNNN is a bare rotor built by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. As the rotating element of a spindle-class synchronous motor, it is paired with a compatible stator to generate torque for high-speed machining centers and other automated motion axes. The rotor operates as part of a complete motor assembly rather than as a standalone device. Its modular IndraDyn H design supports integration with matching stator and spindle housing dimensions across suitable machine configurations.
The rotor can be installed where ambient temperatures remain within 0–40 °C, helping prevent thermal expansion from disrupting the concentric air gap between the rotor and stator. This unit is supplied in the standard design, without optional balancing rings or coolant passages installed. Its frame size of 312 establishes the outer diameter envelope used to select a compatible stator. A machined internal diameter of 160 mm accommodates the shaft sleeve or tool-clamping hardware that can be press-fitted into the bore. Mounting uses a stepped interference fit, which secures the rotor to the shaft without keys and helps reduce runout during high-speed operation. The IP00 protection rating indicates that the rotor has no inherent protection against contact, dust, or moisture. It must therefore be installed within a suitable motor housing that provides the necessary physical protection during operation.
The rotor has a total length of 494 mm, which supports stack alignment and magnetic coupling along the active length of the stator. Its insulation system meets Class F, allowing a maximum insulation temperature of 155 °C when the rotor is incorporated into the complete motor. The IndraDyn H platform is intended for synchronous spindle applications that require constant surface speed, rapid acceleration, and precise rotational control. Correct alignment during assembly helps maintain an even air gap and reduces the risk of vibration at elevated spindle speeds. The machined bore also permits controlled installation forces without unnecessarily distorting the laminated steel core.
