Abstract: In a first step of manufacturing method of an electric motor, a lead wire of a stator coil and a tip portion of a bus bar are welded while being held in parallel. In the second step, a varnish receiving member having a through hole through which a welded portion between the lead wire and the bus bar passes and a slot connected to the through hole. The welded portion is passed through the through hole of the varnish receiving member, and then the lead wire and the bus bar are moved to an end of the slot. In the third step, a fluid varnish is applied to the welded portion while holding the welded portion and the varnish receiving member in a posture in which the welded portion is positioned above the varnish receiving member, and the varnish is solidified.

Abstract: A stator of an electric motor includes: a stator core that includes teeth; and a coil that includes a plurality of turns wound around the teeth. Windings of the coil extend through a slot between two adjacent teeth of the teeth. A side surface of at least one of the two adjacent teeth, the side surface facing the slot, is provided with a first protrusion that separates first two adjacent turns of the turns.

Abstract: The rotor includes (a) a cylindrical outer peripheral annular portion centered on the axis, an inner peripheral cylindrical portion provided on the inner peripheral side of the outer peripheral annular portion, and a plurality of connecting portions connecting the outer peripheral annular portion and the inner peripheral cylindrical portion, (b) the outer peripheral annular portion, a plurality of teeth protruding on the inner peripheral side at predetermined angular intervals centered on the axis C is provided, (c) between the plurality of teeth, N poles and S poles in the circumferential direction of the outer peripheral annular portion are arranged so as to alternately face each other, respectively, (d) the connecting portion, a tooth portion sandwiched either between the N poles or between the S poles of the permanent magnets in the circumferential direction, the inner peripheral cylindrical portion is provided only between.

Abstract: A rotor of a rotary electric machine includes a rotor shaft, a rotor core fixedly supported on an outer circumference of the rotor shaft. The rotor shaft is provided, in a cross section perpendicular to the rotation axis, with a first outer edge portion projecting in a radial direction of the rotor shaft, and a second outer edge portion arranged in line with the first outer edge portion one after the other in a circumferential direction of the rotor shaft. The rotor core has a core insertion hole into which the rotor shaft is inserted, and a shaft holding portion on an inner circumference forming the core insertion hole, the shaft holding portion being configured to hold the first outer edge portion from the opposite sides in the circumferential direction of the rotor shaft. The shaft holding portion is in a non-contact state with the second outer edge portion.

Abstract: A rotor of a rotary electric machine includes a rotor shaft, a rotor core fixedly supported on an outer circumference of the rotor shaft. The rotor shaft is provided, in a cross section perpendicular to the rotation axis, with a first outer edge portion projecting in a radial direction of the rotor shaft, and a second outer edge portion arranged in line with the first outer edge portion one after the other in a circumferential direction of the rotor shaft. The rotor core has a core insertion hole into which the rotor shaft is inserted, and a shaft holding portion on an inner circumference forming the core insertion hole, the shaft holding portion being configured to hold the first outer edge portion from the opposite sides in the circumferential direction of the rotor shaft. The shaft holding portion is in a non-contact state with the second outer edge portion.

Abstract: A locking structure for a stator core that locks the stator core having a circular outer circumference into an inner circumference of a cylindrical housing includes a first cut-out formed in an outer circumference of the stator core and a second cut-out formed in an inner circumference of the housing. The locking structure also includes a key interposed between the first and second cut-outs.

Abstract: A locking structure for a stator core that locks the stator core having a circular outer circumference into an inner circumference of a cylindrical housing includes a first cut-out formed in an outer circumference of the stator core and a second cut-out formed in an inner circumference of the housing. The locking structure also includes a key interposed between the first and second cut-outs.