Patent ID: 8826713

Claim:
A method of manufacturing a stator coil for a stator of an electric rotating machine, wherein the stator comprises a hollow cylindrical stator core having a plurality of slots that are formed in a radially inner surface of the stator core and spaced in a circumferential direction of the stator core, the method comprising the steps of: forming a plurality of substantially planar electric wires, each of the planar electric wires including a plurality of in-slot portions and a plurality of turn portions, each of the in-slot portions being received in a corresponding one of the slots of the stator core, each of the turn portions connecting an adjacent pair of the in-slot portions and being located outside the slots of the stator core; rolling each of the planar electric wires through plastic deformation into a spiral or circular-arc shape; and assembling the rolled electric wires together to form the stator coil, wherein in the rolling step, each of the planar electric wires is rolled by deforming each of the turn portions of the electric wire while restricting circumferential movement of at least one of the in-slot portions of the electric wire which is located closer to a rolling start end of the electric wire than the turn portion is, for each of the planar electric wires formed in the forming step, each of the turn portions has a crank-shaped part that is bent to offset the adjacent pair of the in-slot portions connected by the turn portion from each other in a direction perpendicular to both a longitudinal direction of the electric wire and an extending direction of the in-slot portions, and in the rolling step, during the deformation of each of the turn portions of the planar electric wires, circumferential movement of the crank-shaped part of the turn portion is also restricted.