Product Description:

The 1MR310F-A094 is a rotor component produced by Bosch Rexroth Indramat for the 1MB High-Speed Asynchronous Motors series. As a rotor for a frameless spindle motor, it is installed directly on the machine spindle to generate the rotating magnetic field required for high-speed cutting, grinding, or drilling tasks found in automated machining centers. The motor length code F identifies its stack height within the frame size 310 envelope, and the step interference fit design secures the rotor on the shaft without separate locking hardware, a construction choice that reduces imbalance at very high speeds.

Eight axial mounting points tapped to 8x M8 allow the rotor to be pulled into position with uniform clamping force. The bore is finished to the precision tolerance class H6, so radial runout between the rotor and spindle stays within micrometer limits. A hub diameter of 147 mm establishes the span that mates with the stator inner bore, while the inside diameter is held at 94 mm for a tight fit on the spindle shaft. Around the outside, the rotor reaches an outer diameter of 228.7 mm, giving the lamination stack enough surface area for flux linkage while still clearing the stator teeth. A 7 mm locating-pin hole simplifies angular alignment, and an additional M8 ground terminal thread provides a dedicated bonding point for stray-current protection.

Dynamic balancing is supported through a dedicated ring tapped to M10, allowing material to be added or removed without disturbing the laminations. The mating spindle must use an s6 fit and present a minimum engaged length of 408 mm so the rotor seats fully against the step. Overall rotor length is limited to 400 mm, keeping the assembly inside typical spindle housings while leaving clearance for the stator end windings and any encoder hardware.