Patent ID: 7705504

Claim:
An embedded magnet type motor comprising: a rotor having a rotor core having an axis, and a plurality of magnets forming magnetic poles, the number of which is represented by P; the rotor core having a plurality of accommodation holes arranged over a circumferential direction of the rotor core, the accommodation holes passing through the rotor core along the axial direction; the plurality of accommodation holes including first accommodation holes, the number of which is represented by P/2, extending in a radial direction of the rotor core, and V-shaped accommodation holes, the number of which is represented by P/2, protruding outward in the radial direction, the first accommodation holes and the V-shaped accommodation holes being alternately arranged in the circumferential direction, each V-shaped accommodation hole having a second accommodation hole and a third accommodation hole corresponding to two straight lines forming the V shape, and each first accommodation hole being adjacent to one of the second accommodation holes at one side in the circumferential direction and being adjacent to one of third accommodation holes in the other; and the plurality of magnets including first magnets each arranged in one of the first accommodation holes 1 second magnets each arranged in one of the second accommodation holes, and third magnets each arranged in one of the third accommodation holes, each first magnet and each second magnet forming one of the magnetic pole, and each first magnet and each third magnets forming another the magnetic pole, wherein at least one of an outer end in the radial direction and an inner end in the radial direction of each first accommodation hole has a large-width portion corresponding to a space which is formed in at least a part of the rotor core with respect to the axial direction, the large-width portion has a width corresponding to a dimension in a direction perpendicular to an extending direction of the first accommodation hole as seen from the axial direction, and the width of the large-width portion is larger than a width of the first magnet, wherein the motor is provided with a stator arranged in an outer side in the radial direction of the rotor, the stator is provided with a plurality of teeth extending to an inner side in the radial direction, and the coil is wound around the teeth, and wherein an angular width between an outer end in the radial direction of each first accommodation hole and an outer end in the radial direction of the associated V-shaped accommodation hole is larger than an angular width of an inner end in the radial direction of the teeth.