Product Description:

The 1MR240H-A072 is a rotor supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Delivered as a bare, frameless element, it is built for installation inside a spindle housing where it forms the rotating component of a high-speed induction motor. Within automated machining centers, the rotor couples with a matching stator to generate torque directly on the work spindle, enabling compact assemblies that sustain precise speed control during continuous milling, drilling, or grinding operations.

The magnetic steel core extends to 242 mm, providing the active length needed for efficient flux linkage with the stator windings. A frame size of 240 matches the outer geometry of the 1MB system, ensuring dimensional compatibility with standard stator laminations and cooling jackets. The through-bore measures 72 mm, a clearance that accepts the shaft or tensioning element while still leaving adequate wall thickness for mechanical strength. Radial positioning inside the spindle is guided by an outside diameter of 163.9 -0.05 mm; the tight tolerance supports a step interference fit that eliminates slip under rapid acceleration. Rotational response is influenced by a moment of inertia of 0.153 kgm², giving the spindle predictable run-up and deceleration profiles for high-cycle production.

Additional dimensions finalize the integration envelope. The rotor weighs 37 kg, a mass that balances low vibration with sufficient thermal capacity for extended duty. A machined journal diameter of 71.8 mm aligns with the spindle’s bearing set, while an active spindle length of 245 mm matches common cartridge layouts. For assemblies that include a drawbar or sensor stack, the design reserves a minimum overall spindle section of 335 mm. The H-coded motor length and a total rotor length of 320 mm help the assembly meet envelope limits while maintaining the step interference fit required for high-speed service.