Product Description:

The 1MR200H-A060 is a rotor component produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It serves as the rotating element in a frameless spindle motor, coupling directly to a machine tool shaft and converting the stator’s electromagnetic field into mechanical rotation. Because it is supplied without a separate housing, the rotor can be built directly into a custom spindle assembly, which helps reduce axial length and supports rapid acceleration in machining and grinding equipment. This arrangement is common in high-speed spindle designs where compact packaging and direct mechanical coupling are important.

The rotor uses frame size 200 and has an inside diameter of 60 mm bore for mounting on the spindle shaft. Its axial stack corresponds to motor length code H, which provides a fixed active magnetic length within this rotor format. The bore allows the rotor to seat directly on the spindle shaft without a separate hub assembly. The assembly has a rotor mass of 26.2 kg, so the bearing system must support the resulting centrifugal load at operating speed. It also uses a step interference-fit rotor design to secure the rotor on the shaft and help prevent slip during rapid speed changes.

The laminated stack operates with 2 pole pairs, which supports the high base speeds common in grinding and drilling spindles. The rotor has protection class IP00, so it relies on the surrounding machine structure rather than its own sealed enclosure. Drive tuning uses a rotor inertia of 0.069 kg·m² value when setting current-loop response and jerk limits. It is supplied as a rotor for a 1MB frameless spindle motor and is intended to pair directly with matching Bosch Rexroth stator sections. The open construction also allows cooling air to move freely around the laminated stack when the spindle assembly provides the necessary airflow path.