Product Description:

The 1MR160E-A055 is a rotor component produced by Bosch Rexroth Indramat for integration into the 1MB High-Speed Asynchronous Motors series. As a rotor for a 1MB frameless spindle motor, it forms the rotating core that couples with the stator to generate torque in high-speed machining centers and grinding spindles. Its dimensions and connection features are tailored so OEM builders can insert the rotor into custom housings while maintaining the manufacturer’s balancing and lubrication requirements for continuous industrial automation duty.

This rotor matches a frame size of 160 and carries the motor length code E, giving designers a clear reference for housing depth. A step interference-fit rotor design secures the laminated stack to the shaft without adhesives, and a balancing ring thread of M6 is provided for trim balancing during final assembly. The outer rotor contour reaches 56 mm in diameter and is bored to an inside diameter of 55.0 mm to accommodate the spindle shaft. The overall magnetic length is 185 mm, while a minimum spindle insertion depth of 187 mm ensures complete magnetic overlap. The rotor has 2 pressure-oil connections that allow direct bearing lubrication through the rotor core, reducing thermal growth at high speed.

The remaining geometry fine-tunes how the rotor aligns with mating spindle parts. Both the rotor’s d2 land and the spindle’s secondary seating diameter share a common value of 54.8 mm, establishing a concentric pilot fit. A relief diameter of 55.2 mm (d4) is machined near the drive end to clear adjacent bearing shoulders, while the primary spindle pilot measures 55 mm to match standard toolholder tapers. Within its overall length, a 117 mm magnetic segment and a non-magnetic tail set tooling clearances. Additional shaft support is provided by a spindle land of 120 mm and a secondary land of 63 mm that guide bearing placement and preload spacers.