Product Description:

The 1MR310D-A108/S027 rotor is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a dedicated rotor for a 1MB frameless spindle motor, it serves as the rotating element that couples to the stator, delivering the high peripheral speeds required in machine-tool spindles and other rapid-cycle automation equipment. The component attaches directly to the driven shaft, allowing OEMs to build compact, high-frequency spindles without a full housed motor. In this frameless format, the surrounding spindle assembly provides the supporting structure while the rotor supplies the rotating mass used for power transfer.

Dimensional data shows how the rotor mates with adjacent hardware. Its frame classification of 310 sets the mounting envelope for the spindle housing, while an inner rotor diameter of 108 mm establishes the press-fit region for the shaft. At the periphery, an outer rotor diameter of 228.7 mm determines the air-gap distance to the stator laminations, which is important for magnetic clearance. Axially, the assembly spans 330 mm overall, so quill or bearing seats must be positioned accordingly. Despite these large proportions, the component weighs only 71.9 kg, a value that affects bearing selection and the acceleration profile of the finished spindle. These dimensions must be matched carefully with the mating shaft, stator bore, and bearing layout to maintain proper running clearance. The length code D marks it as a medium-long variant within the series.

A rotational inertia of 0.492 kg·m² keeps stored energy moderate so drive amplifiers can bring the spindle to set speed rapidly without excessive surge current. An M10 thread is machined into the balancing ring seat to accept standard correction screws after assembly. The bore is machined to an H6 tolerance so the shaft achieves repeatable concentricity, and the body is manufactured with a step interference fit that provides a secure radial lock and helps resist creep during prolonged high-speed operation.