Patent ID: 8595915

Claim:
A method of forming a stator of an electric rotating machine, the method comprising: providing a stator core having a plurality of teeth defining a plurality of slots in a circumferential direction; providing a plurality of insulators having a U-shape and a two-layer structure composed of a paper layer and a resin layer, each of the insulators including end portions which bend inward at different angles; partially inserting the insulators in the slots so that at least the end portions of the insulators remain outside of the slots, wherein sides of each of the insulators have a convex shape or a concave shape prior to being partially inserted in the slots; and inserting a stator winding in an opening portion of the insulators so that the insulators and the stator winding are fully inserted in the slots and the end portions of the insulators overlap to completely close the opening portion of the insulators.