Patent ID: 7246428

Claim:
A method for mounting a coil piece onto a core of a rotary electric machine, the core having a plurality of slots each having an opening, the method comprising: repeatedly winding wire having a flat-cross-section so that the wire forms a plurality of wire layers that are laminated in a single row, thereby forming the coil piece in which the wire layers are in a first laminated state, the first laminated state referring to a state in which the plurality of wire layers are aligned along a line that is perpendicular to flat surfaces of the wire, wherein the coil piece has first portions each inserted into one of the slots and second portions that are not inserted into the slots, the first portions and the second portions are arranged alternately along a direction in which the wire extends; shifting the state of the first portions from the first laminated state to a second laminated state by displacing the wire layers in each first portion relative to each other along the flat surfaces of the wire, the second laminated state referring to a state in which each adjacent pair of the wire layers partially overlap with respect to a direction perpendicular to the flat surfaces of the wire; inserting the first portions in the second laminated state into the slots by causing each first portion to pass through the opening of the corresponding slot in an order from the head of the laminated wire layers; and returning the first portions in the slots from the second laminated state to the first laminated state by displacing the wire layers in each first portion relative to each other.