Product Description:

The 1MR160N-C061 is a replacement rotor manufactured by Bosch Rexroth Indramat for integration in the 1MB High-Speed Asynchronous Motors series. Installed inside a frameless spindle housing, the rotor works with an external stator to convert drive current into mechanical torque that spins tooling in CNC machining centers, automated grinders, and similar equipment. Supplying the rotor as an individual part allows spindle performance to be restored without removing the surrounding stator pack or structural components. Because it is used in a frameless spindle assembly, the rotor depends on the surrounding machine structure for bearing support and enclosure.

The rotor has a frame size of 160, providing the radial clearance that matches the corresponding stator laminations. An inside rotor diameter of 60.3 mm sets the bore for the shaft cartridge and any through-spindle coolant passages. The laminated core and cast conductor cage give the rotor a mass of 12.9 kg, and its polar moment of inertia of 0.0267 kg·m² supports predictable acceleration during high-speed start-stop cycles. The rotor uses a step interference fit so it seats concentrically on the shaft stub without keys and maintains balance at maximum speed. This arrangement also helps preserve smooth rotation where vibration and runout must remain low.

The rotor has an enclosure classification of IP00, which means it offers no ingress protection on its own, so shielding against coolant and chips must be provided by the spindle housing. The motor length code N indicates a medium axial stack height that balances torque output with thermal mass. The outer diameter is supplied with measurement, allowing fit to be checked against the stator bore before the press fit. This approach supports fit verification before assembly and helps maintain the air gap between rotor and stator. It is a Rotor for 1MB Frameless Spindle Motor and is intended for use with matching stator segments and bearing cartridges in the 1MB platform.