Product Description:

The 1MR310D-A094/S020 rotor is manufactured by Bosch Rexroth Indramat and belongs to the 1MB High-Speed Asynchronous Motors series. It is the rotating element of a frameless spindle assembly used in industrial automation to convert electromagnetic flux from the stator into mechanical rotation. By supplying inertial mass and a magnetic path, this component enables high-speed, high-precision spindle operation without the constraints of a housed motor. It also allows direct integration of the drive shaft into surrounding equipment. Within the series, it matches stators of the same designation to create a balanced rotor-stator pair.

Its mechanical envelope uses frame size 310, which sets the outside diameter so the rotor seats correctly inside matching stators. An internal rotor bore of 94 mm provides the space required for the motor shaft while maintaining adequate cross-section for magnetic flux conduction. The shaft connection uses a stepped interference fit configuration; the stepped geometry and tight tolerances produce a press fit that eliminates relative motion under load. Dynamic response is influenced by a mass moment of inertia of 0.492 kg·m², allowing predictable acceleration behavior in the spindle system. The rotor has motor length code D, which indicates the axial stack height and overall mass.

This rotor has a mechanical speed limit of 8000 rpm, so the drive must stay within that ceiling to avoid excessive centrifugal forces. It has an IP00 protection rating, which means the component has no inherent shielding against dust or fluid and requires installation inside a suitable enclosure. Delivered as a Rotor for 1MB Frameless Spindle Motor, it is intended to pair only with compatible components for correct magnetic alignment. It mates directly with matching 1MB stators and end shields without dimensional modification.