Product Description:

The 1MR200E-A066 rotor is produced by Bosch Rexroth Indramat as part of the 1MB High-Speed Asynchronous Motors series. Supplied as a rotor for a 1MB frameless spindle motor, it is installed directly on the machine spindle shaft and mates with a separate laminated stator to create a compact, high-speed drive. Within automated milling or grinding cells, the component delivers the inertia matching and thermal stability needed for the spindle to reach target surface speeds while maintaining dimensional accuracy.

Dimensionally, the rotor carries the motor length code E, which in the 1MB platform designates a medium axial package that balances stiffness and mass. The laminated stack and shaft assembly measure 295 mm overall, giving adequate magnetic path length for high-speed operation. A rotor outside diameter of 134.2 mm establishes the air gap when paired with the corresponding 1MB stator, while the inside bore remains at 66 mm to slide over a hollow spindle shaft for tool coolant or sensor wiring. Electromagnetic symmetry is based on 2 pole pairs, a layout that supports the high fundamental frequency demanded by grinding or drilling spindles. The core is manufactured with a step interference fit, and its protection class is IP00 because the rotor is shielded by the machine housing once assembled.

Installation features are specified for balancing and seating. The balancing ring is threaded to M6, allowing standard correction screws to be added during dynamic balance procedures. For envelope compatibility, this rotor matches frame size 200, which sets reference dimensions for bearing spacing and stator lamination diameter in the 1MB series. During assembly, the cylindrical seating surfaces are important: the rotor seat length is 217 mm, giving contact for the press fit to the shaft, while the spindle seat extends to 220 mm so the tool-side bearings clear the magnetic stack. These lengths permit controlled interference without reducing structural rigidity or disrupting the magnetic circuit.