Product Description:

The 1MR160B-A045 rotor is supplied by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. It is the rotating element of a frameless spindle assembly, where the stator mounts in the machine head and the rotor connects directly to the tool shaft. In industrial automation, the component delivers high peripheral speed and stable torque for machining centers, grinders, and tapping heads that rely on balanced, direct-drive spindles.

Frame size 160 matches the rotor to the corresponding stator bore, ensuring concentric air-gap control. The bearing seat at position B is ground to 106.3 mm with a -0.05 mm tolerance so the inner race forms an interference fit. A chamfer with a lead-in angle of 30° eases insertion during spindle assembly. The active magnetic section measures 105 mm in length L3, while a spindle extension of 45 mm in length L6 provides coupling to the tool interface. Step interference construction of the rotor body is complemented by an M6 balancing-ring thread that accepts trim screws for dynamic balancing. Surface roughness is limited to Rz 2 to reduce drag, and length code B assigns the medium axial category.

The external spindle stack begins with a minimum overall length of 107 mm between the bearing shoulders, guaranteeing adequate engagement for clamping nuts and sensor hubs. Immediately behind the active core, an auxiliary rotor segment of 42 mm in length L4 provides mounting space for the fan and encoder rings. A relief angle of 15° blends the step into the journal, and a step height of 0.4 mm locks the interference zone without creating stress risers. The remaining projection L7 measures 58 mm, offering clearance for pull studs, while the end-face undercut is restricted to 5 mm to avoid imbalance. These supplementary dimensions allow accurate alignment of the stator and rotor during high-speed service.