Product Description:

The 1MR310F-A112/S022 rotor is produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It is a rotor for a 1MB frameless spindle motor, intended to transmit torque at elevated speeds inside compact machine tool spindles and other automated machining heads. By providing the rotating mass that couples with the stator, the component forms the core of the motor’s electromagnetic system and supports high surface velocities required in industrial automation.

Dimensional references govern how the rotor integrates with the surrounding housing. The assembly length L1 is 520 mm, establishing the overall stack size available for magnetic laminations and end connections. An outside diameter D3 of 315 mm forms the air-gap interface to the stator, while the 112 mm rotor bore permits mounting on a hollow shaft or thermal expansion sleeve. Within frame size 310 and motor length code F, the rotor length L3 reaches 400 mm, delivering an active section long enough for high pole counts while limiting bending loads. The active rotor section is sized to run within the matching 1MB stator shell while maintaining the required air gap.

Additional dimensions describe the rotor’s supporting and sealing interfaces. The assembly length L2 measures 350 mm, indicating the portion that seats inside the bearing arrangement, and an outside diameter D4 of 408 mm matches the balancing drum in the spindle nose. A balancing ring thread of M10 is provided for fine correction weights, and a pressure-oil supply port tapped M6 supports hydrodynamic bearing lubrication during high-speed operation. The sealing interface uses a Viton O-ring to withstand cutting-fluid exposure, and the rotor uses a step-fit design with an additional L4 length of 312 mm to provide the press-fit zone on the shaft hub.