Patent ID: 8350436

Claim:
An outer-rotor salient-pole concentrated winding motor comprising: a salient-pole concentrated winding stator comprising: a stator core having a plurality of teeth that extend outward in a radial direction of the stator core; coils each comprising: a winding portion formed by annularly winding a wire into a layered structure; a first winding end which is an end of the wire at an outer end of the winding portion in the radial direction of the stator; and a second winding end which is an end of the wire at an inner end of the winding portion in the radial direction of the stator; and insulators retaining the coils and connected to each other in an annular configuration such that the teeth are inserted into the insulators and such that the first winding end of one of the coils is connected to the second winding end of another of the coils with a crossover portion; and a rotor comprising: a rotor holder; and a rotor yoke fixed to an inner peripheral surface of the rotor holder; the salient-pole concentrated winding stator and the rotor being arranged to face each other with a gap between the salient-pole concentrated winding stator and the rotor in the radial direction; each of the insulators comprising: a body portion around which the wire is wound; an outer peripheral flange provided at an outer end of the body portion in the radial direction; an inner peripheral flange provided at an inner end of the body portion in the radial direction; an outer separation wall extending outward in the radial direction from an end of the outer peripheral flange in an axial direction; a first crossover-portion retaining member provided on the outer separation wall and retaining a part of the crossover portion located in a vicinity of the first winding end; a second crossover-portion retaining member provided on the inner peripheral flange and retaining a part of the crossover portion located in a vicinity of the second winding end; a projecting engaging portion provided at one end of the outer separation wall in a circumferential direction and projecting outward in the circumferential direction; a recessed engaging portion provided at another end of the outer separation wall in the circumferential direction and formed so that the outer separation wall is recessed inward in the circumferential direction; and the projecting engaging portion and the recessed engaging portion of adjacent insulators among the insulators engaging with each other when the teeth are inserted into the insulators.