Product Description:

The 1MR200E-A060 rotor is manufactured by Bosch Rexroth Indramat and belongs to the 1MB High-Speed Asynchronous Motors series. Designed as the rotating core of a frameless spindle motor, it converts electromagnetic torque from the stator into mechanical rotation for machining centers and other automated equipment. By offering a separable rotor element, it lets machine builders integrate high-speed spindles directly into custom housings while preserving the thermal and dynamic properties expected from the 1MB series.

With a frame size of 200, the rotor matches stator assemblies with a 200 mm lamination stack and bearing span, providing sufficient magnetic area for elevated surface speeds. Its bore, or inside diameter, measures 60 mm, leaving space for a rigid shaft or drawbar system without compromising wall thickness. The length code E denotes the fifth length variant in the range, which determines the active iron length and the achievable power density. Because the motor uses an Asynchronous principle, no permanent magnets are embedded, and torque is induced through rotor currents. The design employs a step interference fit between the rotor body and shaft to maintain concentricity during thermal expansion cycles.

The external surface is delivered completely processed, so additional turning or grinding is unnecessary before assembly into the stator bore. A mass moment of inertia of 0.059 kg·m² keeps angular acceleration demands moderate for high-speed cutting trajectories, while the physical mass of 22.3 kg contributes to thermal stability under continuous load. The component is specified as a rotor for a 1MB frameless spindle motor and is intended to work only with corresponding 1MB stator and cooling packages, so air-gap, insulation clearance, and balancing tolerances remain within the limits needed for safe overspeed operation.