Product Description:

The 1MR200D-A060 is a rotor module supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a rotor for a frameless spindle motor, it seats directly on the machine shaft and works with a separate stator to generate the rotating magnetic field needed in CNC machining centers and automated grinding lines. Its job is to transmit motor torque at high speed while keeping the air gap uniform, a requirement for repeatable surface finish and tool life.

With a frame size of 200, the rotor aligns to housings that share the same stator bore and bearing spacing. Its inside diameter of 60 mm leaves clearance for a central shaft, coolant tubes, or drawbar mechanisms, depending on the spindle layout. The precision-ground outer surface measures 134.2 −0.05 mm, enabling an interference fit that eliminates slip between the rotor and the laminated stack. Length code D indicates a longer axial stack, which increases active iron volume and raises rated power output. A configuration of 2 pole pairs fixes the electrical frequency-to-speed ratio at two electrical cycles per mechanical revolution, which is a common choice for high-speed machining where synchronous frequencies would otherwise become excessive.

Dynamic behavior and assembly considerations are determined by several further values. The rotor weighs 19.6 kg and exhibits an inertia of 0.037 kg·m²; this balance allows fast acceleration while providing enough stored energy to smooth spindle load changes during cutting passes. Because the component is delivered with a protection rating of IP00, it relies on the enclosing motor housing for shielding and ventilation. The step interference fit is hydraulically released through a pressure oil pin machined to DIN 913, and long-term seating is secured with LOCTITE 620 thread locker.