| CPC H02K 3/522 (2013.01) [F04C 23/02 (2013.01); F04D 25/06 (2013.01); F25B 31/026 (2013.01); H02K 2203/12 (2013.01)] | 14 Claims |
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1. A motor, comprising:
a stator; and
a rotor that is rotatable relative to the stator;
the stator having a stator core, a stator winding, a plurality of first insulation sheets and a plurality of second insulation sheets,
the stator core having a yoke extending annularly around an axis of the stator core, a plurality of teeth extending radially inward from the yoke, and a plurality of slots each defined by the yoke and a pair of adjacent teeth,
each of the teeth having a tip part on opposite side from the yoke, each of the tip parts having a pair of tooth projections respectively protruding toward a first side and a second side in a circumferential direction,
the stator winding having a plurality of phase windings,
each of the phase windings having a plurality of winding portions,
each of the winding portions having a winding part, the winding parts being respectively wound around the teeth of the stator core,
the first insulation sheets respectively providing electrical insulation between the yoke and the winding parts and between the teeth and the winding parts, and the second insulation sheets respectively providing electrical insulation between adjacent ones of the winding parts,
wherein each of the first insulation sheets has a body part and a pair of first end parts respectively formed by folding both ends of the body part toward each other, the body parts respectively being disposed in the slots and facing an inner peripheral surface of the yoke and side surfaces of adjacent teeth,
each of the second insulation sheets has an interphase insulation part and a pair of second end parts respectively formed by folding both ends of the interphase insulation part away from each other, the interphase insulation parts respectively being disposed between adjacent ones of the winding parts,
a first electrical insulator assembly is disposed on a first stator core end surface on a first side of the stator core in an axial direction and a second electrical insulator assembly is disposed on a second stator core end surface on a second side of the stator core in the axial direction,
each of the first electrical insulator assembly and the second electrical insulator assembly has an outer wall part extending in a circumferential direction and facing the yoke, and a plurality of extending parts extending radially inward from the outer wall part and respectively facing the teeth,
each of the extending parts of the first electrical insulator assembly has a tip part on an opposite side to the outer wall part, each of the tip parts having a first radial movement restriction part protruding toward a first side in the circumferential direction and a second radial movement restriction part protruding toward a second side in the circumferential direction,
each of the extending parts of the second electrical insulator assembly has a tip part on an opposite side to the outer wall part, each of the tip parts having a third radial movement restriction part protruding toward the first side in the circumferential direction and a fourth radial movement restriction part protruding toward the second side in the circumferential direction,
the tooth projections, the second end parts, the first end parts and the first and second radial movement restriction parts of the first electrical insulator assembly are arranged in this order from inside to outside in a radial direction so as to overlap in the radial direction such that the first and second radial movement restriction parts block radially outward movement of the second end parts and the first end parts, and
the tooth projections, the second end parts, the first end parts and the third and fourth radial movement restriction parts of the second electrical insulator assembly are arranged in this order from inside to outside in the radial direction so as to overlap in the radial direction such that the third and fourth radial movement restriction parts block radially outward movement of the second end parts and the first end parts.
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