Patent ID: 8397368

Claim:
A method of manufacturing a stator for 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 to be 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 to be located outside the slots of the stator core; rolling each of the planar electric wires by more than one turn into a spiral shape; forming a stator coil by assembling the rolled electric wires through elastic deformation thereof; and assembling the stator core and the stator coil together to form the stator; wherein, in the electric wire rolling step, each of the planar electric wires is rolled by plastically deforming the turn portions of the electric wire into a plurality of circumferentially-extending sections each having a predetermined curvature, and for each of the electric wires, a curvature ratio of a radially-outermost one of the circumferentially-extending sections is set to be greater than that of a radially-innermost one of the same, where, for each of the circumferentially-extending sections, the curvature ratio of the section represents the ratio of the curvature of the section during the rolling of the electric wire in the electric wire rolling step to the curvature of the section in the stator coil formed in the stator coil forming step.