Patent ID: 7847464

Claim:
A method for producing an armature of a rotary electric machine, the armature including: an armature core that is formed on an armature shaft; a plurality of slots that are formed in a circumferential direction on an outer periphery of the armature core so as to face in an axial direction; a plurality of commutator segments that are formed in a circumferential direction on an outer periphery of the armature shaft; and a plurality of coils that are formed on an outer periphery of the armature core to generate magnetic fields by winding a conductor through an arbitrary pair of slots among the plurality of slots, winding-start and winding-ends of the conductors being connected to a predetermined arbitrary pair of commutator segments among the plurality of commutator segments, the method comprising: using a winding device that includes a plurality of nozzles movable in both the axial direction and a radial direction with respect to the armature so as to draw out a plurality of conductors to the plurality of slots of the armature core such that the plurality of coils are simultaneously formed through a single winding operation, wherein the single winding operation includes: drawing out each of the plurality of conductors from each of the plurality of nozzles; winding the drawn-out conductor through one arbitrary slot among the plurality of slots from a side of the plurality of commutator segments, and winding the drawn-out conductor through another arbitrary slot among the plurality of slots to the side of the plurality of commutator segments in a manner in which at least one of the plurality of slots is interposed between the two arbitrary slots around which the drawn-out conductor is wound, one of the plurality of conductors being disposed into two arbitrary slots of the plurality of slots by using one of the plurality of nozzles through the single winding operation, wherein when a number N of the plurality of nozzles of the winding device is set at a number (N=S/n) obtained by dividing a total number S of the plurality of slots by a natural number n, a number of the plurality of conductors disposed in the plurality of slots is 2S/n per single winding operation, a number of times of the winding operation performed by the winding device is not a multiple of the natural number n, and the conductors that form the plurality of coils are wound so that a number obtained by dividing a total number C of the conductors, which are wound around all of the plurality of slots to form the plurality of coils, by twice the number S of the total number of the plurality of slots of the armature core (C/2S) is not a natural number.