Product Description:

The 1MR160F-A060 is a rotor assembly manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the rotating core of a frameless spindle motor, this component converts the stator’s alternating magnetic field into mechanical torque that drives high-speed machining spindles used in industrial automation centers. By supplying only the rotor, the design allows machine builders to integrate the active parts of the motor directly into custom housings, saving axial space and reducing thermal barriers between the motor and the machine structure.

The rotor corresponds to a 160 frame, so it mates with stators and bearing supports built for that flange diameter. An internal bore of 60 mm provides a passage for the spindle shaft and any through-spindle services. The axial package uses the F length code, which sets the magnetic stack height and the continuous power when paired with its matching stator. With 2 pole pairs, the spindle reaches synchronous speeds that suit high-frequency inverter outputs, keeping surface speed within tool limits. A rotational inertia of 0.0161 kg·m² balances rapid acceleration with stable cutting, minimizing load on the drive while resisting speed ripple from discontinuous chip formation.

The operating principle is Asynchronous AC, so torque is generated by induced currents rather than permanent magnets, allowing safe overspeed operation during tool changes. An open IP00 protection code means enclosure sealing must be provided by the machine builder, but it also improves heat dissipation into the surrounding spindle structure. The rotor uses a step interference fit to maintain a tight mechanical lock on the shaft and prevent micro-slippage at high rpm. A total mass of 7.7 kg affects bearing preload selection and the dynamic balance requirements for vibration-limited machining environments.