Product Description:

The 1MR160H-A061 is a dedicated rotor subassembly produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As the rotating core of a frameless spindle motor, it converts the electromagnetic field generated by the stator into mechanical torque and the high spindle speeds required in CNC milling, drilling, and grinding centers. Integrating this rotor into the matched stator lets machine builders create compact spindles that deliver stable speed control while keeping vibration low during continuous industrial machining.

With a frame size of 160, the rotor matches stators that share the same mechanical envelope, ensuring proper air-gap alignment. The internal bore measures 60.3 mm, a clearance that accommodates the machine shaft and shrink-fit mounting tools, while the outside diameter of 106.3 mm sets the magnetic path length that influences torque density. Dynamic response is affected by the polar inertia; at 0.0201 kg·m² the rotor stores moderate angular momentum, so acceleration and deceleration profiles remain controllable without excessive drive current. The steel and copper stack weighs 9.9 kg, a mass light enough for high spindle speeds yet substantial enough to damp small load variations.

Length code H indicates an extended magnetic stack that increases power capability without changing the frame diameter. Overall rotor section L3 spans 255 mm, while the active lamination segment L4 measures 187 mm; separating these two dimensions helps position bearings and tool holders without compromising the electromagnetic zone. The rotor is manufactured with a step interference fit, so once heated and pressed onto the shaft, it achieves a microscale friction bond that resists centrifugal forces during very high rotational speeds.