Product Description:

The 1MR312C-A060 rotor is produced by Bosch Rexroth Indramat and belongs to the 1MB High-Speed Asynchronous Motors series. It is supplied as the rotating element of a 1MB frameless spindle motor, allowing machine-tool spindles to reach elevated surface speeds while keeping the stator outside the work envelope. By pairing this dedicated rotor with a matching stator, the assembly can fit directly inside housings used on milling, grinding, or drilling equipment in automated production lines. This format is commonly used where the rotor mounts directly on the shaft instead of inside a complete motor housing.

The kit is intended for an unprotected installation area because its degree of protection is rated at IP00, so the surrounding machine structure must provide airflow and protection from debris. An inside diameter of 60 mm leaves space for a large shaft or drawbar, while the open kit motor construction helps reduce overall spindle diameter. The electromagnetic system follows a three-phase topology, so it works with conventional three-phase inverters that supply the required sinusoidal current. The pressure-oil channels are closed by 2 dedicated screws, which help keep lubricating oil routed to the bearing seats instead of the stator gap. The motor length code is C, which indicates the axial stack and magnetic length used in this rotor.

Mechanical retention relies on a rotor body machined with a step interference fit, delivering secure torque transmission when the assembly is heated for shrink fitting. The oil supply path is sealed by 1 O-ring. The magnetic circuit follows an asynchronous principle, so slip between the rotating field and the laminated core produces torque without permanent magnets. This rotor is intended to be integrated into a surrounding spindle structure that provides the final enclosure, cooling path, and bearing support.