Product Description:

The 1MR200D-A066 is a rotor supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a dedicated replacement part for frameless spindle motors, it transmits torque to high-speed machine-tool shafts and supports the rapid acceleration profiles required in automated milling, grinding, and drilling centers. Used inside a direct-drive spindle assembly, it works with the matching stator to convert motor output into stable rotation at very high speed. This arrangement supports spindle designs that place the motor directly around the shaft rather than using belts or couplings.

This rotor has a degree of protection of IP00, so it relies on the surrounding spindle housing for sealing and cooling. A frame size of 200 establishes the outer dimensional envelope that matches the corresponding stator. The inside diameter measures 66 mm, providing clearance for the shaft sleeve, drawbar, or coolant passages used in direct-drive spindles. During operation, the laminate stack tolerates surface speeds up to 18,000 min⁻¹, allowing cutting tools to reach the high surface speeds needed for fine finishes on nonferrous materials. Corrosion resistance is improved by a layer of rust-protection varnish, which shields the electrical steel from moisture during storage and idle periods.

The motor length code is D, which corresponds to the axial stack height used for this rotor version. The mechanical interface uses a step interference fit, and this stepped geometry locks the rotor to the shaft without keys to minimize imbalance at maximum speed. Dynamic behavior is shaped by a rotor inertia of 0.037 kg·m², while a total rotor mass of 19.6 kg provides the required magnetic cross-section without adding unnecessary load. The rotor outer diameter is completely processed, so the cylindrical surface is ground to final tolerance for alignment, air-gap uniformity, and balance correction after assembly.