MRS312H-2N-0112-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS312H-2N-0112-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features a 312 frame size with a standard design. This rotor has an internal diameter of 112 mm, a total length of 594 mm, and supports a step interference fit mounting style. It has an insulation class F and an IP00 protection rating.
Internal Product Review
The MRS312H-2N-0112-NNNN is a synchronous spindle rotor from the IndraDyn H series. Step interference fit mounting and a bored rotor interface give the assembly process a precise, secure feel in spindle builds. IP00 construction and Class F insulation make the unit well suited for controlled cabinet environments, a strong choice for exacting motor integration.
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Product Description:
The MRS312H-2N-0112-NNNN is a rotor element built by Bosch Rexroth Indramat for the MRS Synchronous IndraDyn H Motors series. As a dedicated rotor, it pairs with the matching stator section of an IndraDyn H synchronous spindle motor to generate torque in high-speed machining centers and other precision automation applications. Its geometry, magnetic layout, and interference-fit mounting allow the assembly to transmit spindle power while maintaining the thermal and mechanical tolerances required in closed-loop CNC drive systems.
The rotor is specified for ambient temperatures between 0 and 40 °C, ensuring that its magnetic properties and mechanical growth remain predictable across typical shop-floor temperatures. It is supplied in the standard design, so no optional balancing rings or specialized coatings are applied. The mechanical envelope follows frame length code H and frame size 312, two identifiers that indicate the stack height and outer diameter matched to the corresponding spindle stators. Windings on the companion stator use insulation class F, so the rotor surface speed and induced losses must remain within limits that keep winding temperatures below the 155 °C ceiling.
As part of the rotating assembly, the component has an internal diameter of 112 mm, which accommodates a large drawbar or cooling shaft without compromising rigidity. Installation uses a step interference fit, and the rotor bore is machined accordingly to achieve the required press fit after thermal shrinking. Because the component alone has a protection rating of IP00, it must be enclosed by the motor housing before exposure to coolant or chips. With a total length of 594 mm, the rotor spans the full axial stack of an H-length frame, providing sufficient polar moment for constant-speed cutting while remaining within the balancing limits established for high-speed synchronous spindles.
