Product Description:

The 1MR200C-A066 rotor is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. This component forms the rotating core of a frameless spindle assembly; once inserted into a matching stator, it converts electromagnetic energy into the mechanical speed required by high-speed milling, drilling, and grinding centers. Supplying the rotor as an individual part lets machine builders pair it with customized housings, coolant paths, and sensor packages while retaining the intended electromagnetic geometry.

At the mechanical interface, an M6 balance ring thread is tapped into the shaft nose so a correction ring can be added during dynamic balancing. The outer rotor diameter measures 134.2 mm, establishing the air-gap distance to the stator laminations and influencing tip speed at the peak operating frequency. An inside diameter of 66 mm leaves space for a through-shaft coolant line or drawbar common in direct-drive spindles. Dimensional precision is guarded by an outer-diameter tolerance of -0.08 mm, limiting radial runout and keeping bearing loads predictable. The magnetic stack and shaft combine to an overall rotor length of 205 mm, which fixes the active axial field length and influences both torque capability and critical bending frequency.

Additional features complete the geometric profile needed for interchangeability. The frame size designation of 200 aligns this rotor with stators that share the same flange circle and bearing set. The stack height is identified by motor length code C, allowing winding data to be verified without disassembly. To secure the rotor inside the laminated core, the design uses a step interference fit; this stepped seat holds concentricity after thermal cycles and prevents axial creep at high rpm. The rotor is suited to high peripheral speeds in machine-tool spindle service.