Product Description:

The 1MR160F-A055 is a rotor supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a dedicated rotor for a frameless spindle motor, it forms the rotating core that couples to a machine tool shaft. It enables high peripheral speed in industrial automation tasks such as milling or drilling, where compact, high-frequency spindles are required. Because the rotor is supplied as a separate component, it is intended to be integrated into a spindle assembly that provides the shaft, bearings, and surrounding stator structure.

This rotor is built around an inside diameter of 55 mm, allowing it to slip over a mating shaft while preserving a frame size of 160. Its overall axial length is 200 mm, with complementary length values of 135 mm for G and 132 mm for L4, which position the magnetic stack relative to the mounting face. A step interference fit is used for mounting, so the rotor can be heated and shrunk onto the shaft for accurate concentricity. Mass is 10.2 kg, and the polar moment of inertia is 0.0161 kgm2, which affects spindle acceleration and braking response. The outside diameter is 179.7 mm with a -0.3 mm tolerance to maintain the intended air gap to the stator.

Mounting features include an anti-rotation pin hole of 4 mm, axial mount threads of M5 (8×), and twelve balancing-ring holes tapped 12× M6. A matching M6 ground terminal and an M6 balancing-ring thread provide grounding and balancing attachment points, while eleven additional M5 mounting holes are placed on the flange. The minimum mounting dimension A is 70 mm for clearance inside the spindle housing, and pressure and disassembly oil connections are provided to assist shrink-fit installation or removal. The distribution of threaded and balancing features supports adjustment after assembly so rotating mass can be corrected as needed. Fasteners follow the DIN 913 threaded-pin standard, and rotor length code F identifies the overall stack height used for this version.