Patent ID: 8082653

Claim:
A method of producing a coil for use in an electric rotary machine, the coil being to be wound in a stator core in which a plurality of slots are arrayed in a circumferential direction of the stator core, the coil including a plurality of phase-windings each of which is waved in the circumferential direction and has a length made up of in-slot portions, turned portions, and a coil bend defined by one of the in-slot portions, each of the in-slot portions being to be disposed in one of the slots, each of the turned portions connecting between adjacent two of the in-slot portions outside the stator core, each of the phase-windings being folded at the coil bend so as to reverse a direction in which the phase winding is wound in the stator core, the method comprising the steps of: bending each of straight coil wires into a rectangular wave shape including the in-slot portions and the turned portions; turning a coil bend-forming portion that is one of the in-slot portions of each of the coil wires which becomes the coil bend of the phase winding by 180° around an axis of the one of the in-slot portions; twisting the turned portions of one of the coil wires and the turned portions of another of the coil wires together to weave the coil wires into a wire bundle; and folding said wire bundle at the coil bend-forming portions of the coil wires to place sides of the wire bundle to overlap each other to make the coil.