Patent ID: 8752275

Claim:
A method of forming stator coils of a stator of electric machinery, the stator including: a circular stator core; an even number of tooth sections radially projecting from the stator core; a plurality of slots, each slot being a space formed around one of the tooth sections, each of the slots being divided into a longitudinal outer part and a longitudinal inner part; an insulator covering the stator core and the tooth sections; and stator coils respectively formed in the slots by multiple-winding a magnet wire on the tooth sections, said method comprising the steps of: (a) regularly winding the magnet wire in vacant longitudinal outer parts of alternate slots, without getting into spaces for inserting a nozzle of a wire coiling machine, whereby the slots have alternating wound and vacant longitudinal outer parts; (b) following said step (a), regularly winding the magnet wire in the vacant longitudinal outer parts of the slots sequentially and inserting at least a terminal end of the outermost layer of the magnet wire into the space for inserting the nozzle of the wire coiling machine; (c) following said step (b), regularly winding the magnet wire in vacant longitudinal inner parts of alternate slots, without getting into spaces for inserting the nozzle of the wire coiling machine, whereby the slots have alternating wound and vacant longitudinal inner parts; and (d) following said step (c), regularly winding the magnet wire in the vacant longitudinal inner parts of the slots sequentially and inserting at least a terminal end of the outermost layer of the magnet wire into the space for inserting the nozzle of the wire coiling machine, whereby the coils are arranged in the circumferential direction of the motor core.