Product Description:

The 1MR160B-A055 is a rotor element built by Bosch Rexroth Indramat for integration into the 1MB High-Speed Asynchronous Motors series of frameless spindle drives. As a dedicated rotor, it mates with a corresponding stator to create a compact, high-speed spindle assembly used for machining centers and other automated tooling. By supplying a pre-balanced interference-fit core, the manufacturer streamlines spindle construction and maintains the thermal and dynamic characteristics required in continuous industrial operation.

The rotor’s axial length of 105 mm establishes its magnetic stack height and contributes to torque capability. Dynamic balance is achieved with Threaded Pins, allowing technicians to fine-tune mass distribution during assembly. Those pins seat in a balancing ring that carries an M6 thread, a standard size compatible with shop tooling for quick correction. An end-stop surface of 70 mm minimum offers a mechanical reference that limits axial movement when the rotor is pressed onto the spindle shaft. The component belongs to frame size 160, so its outer geometry matches stators and housings designed around this standard envelope.

Dimensional accuracy is supported by an outer-diameter concentricity of 0.04 mm, which keeps the air gap uniform at high rotational speeds. Two dedicated pressure-oil channels, denoted as 2, feed lubricating oil through the shaft to release the shrink fit during maintenance. The specified removal-oil viscosity is 900 mm²/s at +20°C, ensuring the film remains stable long enough to overcome the interference fit without scoring adjacent parts. A rotor bore diameter of 55.0 mm follows an H6 tolerance, letting the step interference design secure itself on the spindle shaft, while the un-bolded outer diameter of 106.3 −0.05 mm maintains clearance within the stator bore. Threaded pins comply with DIN 913 standards, completing the mechanical interface set described earlier.