Patent ID: 8536749

Claim:
A motor, comprising: a rotor including: a rotor core; a plurality of magnets arranged along the circumferential direction of the rotor core, the magnets functioning as first magnetic poles, the number of which is p; and a plurality of salient poles integrally formed with the rotor core, each salient pole being located between a circumferentially adjacent pair of the magnets with caps in between, and functioning as a second magnetic pole different from the first magnetic poles; and a stator including: a stator core arranged to be opposed to the rotor in the radial direction, the stator core having a plurality of radially extending teeth that are arranged at equal intervals in the circumferential direction; and multiphase coils wound about the teeth; wherein, the number of teeth, L, is 2×p×m×n (where m is the number of the phases of the coils and n is a natural number); the stator core includes slots, each slot being located between circumferentially adjacent teeth and extending through the stator core in the axial direction; the coil of each phase includes a plurality of segment conductors, each of which has slot insertion portions, the slot insertion portions extending through the slots in the axial direction, and the segment conductors being electrically connected to each other by welding ends of the slot insertion portions protruding from the slots; and when: the occupancy angle of each magnet is defined as a first magnetic pole occupancy angle (electrical angle) θ 1 , which ranges from the midpoint of the gap between the magnet and one of the circumferentially adjacent salient poles to the midpoint of the gap between the magnet and the other circumferentially adjacent salient pole, and the occupancy angle of each salient pole is defined as a second magnetic pole occupancy angle (electrical angle) θ 2 , which ranges from the midpoint of the gap between the salient pole and one of the circumferentially adjacent magnets to the midpoint of the gap between the salient pole and the other circumferentially adjacent magnet, the following expression is satisfied: θ1+θ2=360°, and the first magnetic pole occupancy angle θ 1 is set to a value in the range of 210°≦θ 1 ≦270° such that the torque ripple of the motor is reduced.