Product Description:

The 1MR160F-B065/S032 rotor is supplied by Bosch Rexroth Indramat as a component of the 1MB High-Speed Asynchronous Motors series. It acts as the rotating element in a 1MB frameless spindle motor and couples electromagnetically with the stator in machine-tool and grinding spindles, where stable high-speed rotation is required. This unit follows motor length code F and uses a design without a rotor sleeve, which allows direct shrink-fitting onto the shaft and helps minimize radial runout in high-speed assemblies.

Cooling is handled through the IC3W7 water-through rotor system, which routes coolant close to the copper to stabilize temperature during continuous high-speed duty. Because the assembly carries an IP00 degree of protection, it must be enclosed by the machine builder to prevent contact with live parts. The maximum mechanical speed is 20000 rpm, so balancing class and bearing selection must match this limit. The central bore measures 65 mm, giving clearance for a drawbar or media supply. With a rotor inertia of 0.0161 kg·m², acceleration profiles can remain short while still providing enough momentum for surface finish consistency. A rust-protection varnish coats the active steel to resist condensation, and the permissible ambient range is 0 °C to 40 °C in operation, -25 °C to 55 °C during storage, and -25 °C to 70 °C during transport.

At just 10.2 kg, the rotor keeps bearing loads moderate, which is important for spindles built on the 160 frame size that already use high-preload angular-contact bearings. The insulation system is rated to 155 (F), supporting thermal loads created by rapid acceleration and deceleration without degrading varnish integrity. Reliable performance is maintained up to 1000 m installation altitude, ensuring full torque at standard atmospheric pressure.