MRS312D-2N-0130-NNNN Bosch Rexroth Indramat
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The Bosch Rexroth Indramat MRS312D-2N-0130-NNNN is part of the MRS Synchronous IndraDyn H Motors series and features a step interference fit mounting style. This synchronous motor has a rotor outer diameter of 238 mm, an internal diameter of 130 mm, and an overall length of 419 mm. It includes balancing threads of 24 x M8, each 12 mm deep, and a hole circle diameter of 215 mm.
Internal Product Review
The MRS312D-2N-0130-NNNN is an IndraDyn H synchronous motor rotor engineered for step interference fit mounting. Seat roughness rated at Rz2 and a 30° lead-in angle support precise installation and dependable mechanical seating. The configuration makes a strong choice for high-precision drive assemblies.
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Product Description:
The MRS312D-2N-0130-NNNN is a synchronous motor rotor body produced by Bosch Rexroth Indramat within the MRS Synchronous IndraDyn H Motors series. In automated machinery, this component forms the rotating core that transfers magnetic torque from the stator to mechanical loads, enabling precise speed and position control in packaging lines, gantry axes, and material-handling systems. Its size code indicates compatibility with high-power IndraDrive units and helps ensure that the installation meets the tight tolerances required in servo motion systems.
With an overall length of 419 mm, the rotor provides sufficient magnetic depth for high torque while fitting standard housings. A lamination length of 375 mm forms the active iron section and leaves space for end rings and balancing hardware. The outside diameter is controlled to 238 mm, with a tolerance of 0/-0.15 mm, so the air gap remains uniform at operating speed. An internal bore of 130 mm accepts a through-shaft or cooling mandrel without weakening the core. The shaft seats use a stepped interference fit, which locks the rotor to the hub without keys and minimizes eccentricity. Two M6 ports route pressure oil through the assembly, and a 5 mm undercut is located beneath the bearing seat.
A concentric hole circle measuring 215 ±0.3 mm governs the placement of coupling fasteners, allowing the rotor to align precisely with the mating flange on a gearbox or flywheel. Dynamic balance correction is handled by 24 M8 threaded holes, each 12 mm deep and distributed around the rim, so grub screws can be inserted to reduce residual vibration. The rotor uses a 60-segment skew, while a lead-in angle of 30° eases assembly onto the shaft shoulders and reduces stress at the entry chamfer. The seat has a surface roughness of Rz2, providing a fine finish that supports accurate mating with precision bearings. These machined surfaces must remain clean and free of damage during assembly to preserve the intended alignment between the rotor, shaft, and bearing seats.
