Product Description:

The 1MR200H-A066 rotor is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a dedicated rotating element, it mates with a frameless stator to create a high-speed spindle assembly used in CNC machining centers and other industrial drives that demand rapid acceleration and stable operation at elevated frequencies. The rotor’s geometry, balance, and interference fit allow it to transmit torque efficiently while maintaining concentricity within the motor housing.

This model is built on frame size 200, establishing the overall outer diameter and permitting direct pairing with stators of the same metric envelope. A bore diameter of 66 mm through the rotor axis leaves room for coolant tubes or drawbar mechanisms common in spindle applications. Mechanically, the lamination stack and sleeve are rated for a circumferential speed corresponding to 18000 rpm, which is the upper limit for safe rotational service before tensile stresses approach the material limit. The rotor core uses a step interference fit, so when it is heated and pressed onto the shaft, it locks without additional keys and helps reduce imbalance. Dynamic response is influenced by its mass moment of inertia of 0.069 kg·m², and this value must be considered when tuning the drive to achieve target acceleration profiles.

The axial dimension is represented by motor length code H, indicating a longer active stack that increases available output power once the rotor is combined with its matching stator. Because the assembly is supplied in an unenclosed state, its protection classification is IP00, meaning the user must provide guarding against contact and contamination during final machine integration. Total rotating mass reaches 24.5 kg, a figure important for bearing selection and for calculating gyroscopic loading during rapid tool changes. Within the product hierarchy, the unit is formally designated as a Rotor for 1MB Frameless Spindle Motor, clarifying that it is not a complete motor but a component for modular high-speed spindle assemblies.