Product Description:

The 1MR160D-A040/S030 is a dedicated rotor assembly supplied by Bosch Rexroth Indramat as part of the 1MB High-Speed Asynchronous Motors series. Classified as a rotor for a 1MB frameless spindle motor, it mounts directly on machine-tool spindles where compact, high-inertia rotation is needed. In industrial automation, the component works with a matching stator to convert drive current into the rapid rotational motion that milling, drilling, or grinding heads depend on for precise material removal.

Its mechanical interface starts with a bore diameter of 40 H6 mm, allowing a slide fit over the spindle shaft while maintaining tight radial alignment. A center bore of 41 mm gives clearance for draw-bar mechanisms or internal coolant passages. The rotor belongs to frame size 160, so its magnetic geometry matches stators of the same diameter class. External dimensions are kept compact with an outer diameter of 106.3 mm, limiting mass and centrifugal stress at high speed. Lubrication oil is introduced through a pressure port machined with an M6 thread, letting designers route pressurized oil directly into the bearing seats without external manifolds.

The rotor length is 150 mm, creating an axial stack that balances torque production with dynamic stiffness. Seat tolerances are divided between a drive-end land of 40 s6 mm and an opposite land of 39.8 t6 mm, so the rotor can be positioned axially without shims while still achieving the interference fit needed for thermal growth. The unit carries motor length code D, aligning the lamination packet with the torque class expected from a 160 frame body. A step interference fit is machined into the rotor body to secure the sleeve to the shaft, eliminating fretting during rapid speed changes and supporting the oil-fed mounting strategy mentioned above.