Patent ID: 8766505
Filing Date: 2014-07-01
Classification: H02K,Y10T

Abstract:
1. A rotary electric machine comprising a ring core made up of a plurality of stacked ring-shaped core plates each comprising a plurality of divided core plates, a shaft inserted through the ring core, and a plurality of magnets inserted in magnet insertion holes defined in the divided core plates, wherein each of the ring-shaped core plates has on an inner circumferential surface thereof a plurality of plate-side protrusions projecting toward the shaft, and the shaft has on an outer circumferential surface thereof a plurality of shaft-side protrusions projecting toward the divided core plates; each of the plate-side protrusions has a plate-side tapered portion having a width progressively greater toward the shaft, and each of the shaft-side protrusions has a shaft-side tapered portion having a width progressively greater toward the divided core plates; and a tapered surface of the plate-side tapered portion and a tapered surface of the shaft-side tapered portion are pressed against each other, securing the ring core to the shaft, under a force acting in a direction to move the plate-side protrusions and the shaft-side protrusions away from each other.