Product Description:

The 1MR160F-A040 rotor is manufactured by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. Designed as a rotor for frameless spindle motors, it provides the rotating mass that links directly to high-speed grinding or milling spindles, converting electromagnetic torque from the stator into mechanical speed. Because it is supplied as a separate component, it can be paired with a matching stator and housing to create compact, high-precision machine-tool spindles used in automated production cells. This format is useful where the spindle shaft, bearings, and motor elements are integrated into one assembly.

The rotor uses frame size 160, giving an outer diameter envelope matched to mid-power machine-tool spindles. Its motor length code F sets the axial section and contributes to a minimum spindle length of 202 mm, leaving space for bearing seats and tool-clamping parts. Two stepped journal diameters are supplied: 40.0 mm on the primary mounting side and 39.8 mm on the secondary side, creating the step interference used by the rotor design. The outer steel laminations are finish ground to 106.3 mm with a minus 0.05 mm tolerance so the rotor clears the air gap evenly at rated speed without excess vibration. A balancing ring thread is provided for optional trim weights.

The journals seat in shafts using an s6 interference fit on the 40 mm side and a t6 location fit on the 39.8 mm side, controlling radial runout once the rotor is pressed into the spindle sleeve. A 40 mm central bore machined to an H6 tolerance accommodates the drawbar or coolant tube while still permitting thermal expansion. Lubrication can be routed through the rotor via an internal oil channel that terminates at an M6 pressure-oil thread, simplifying connection of external lubrication lines. This fit arrangement helps keep the rotor centered during high-speed operation.