Patent ID: 7750523

Claim:
An embedded magnet motor, comprising a rotor, wherein the rotor includes a rotor core having an axial line and a plurality of magnets constituting magnetic poles, the number of which is represented by P, wherein the rotor core has a plurality of accommodation holes arranged in a circumferential direction of the rotor core, wherein the accommodation holes perforate the rotor core along the axial direction of the rotor core, wherein the accommodation holes include first accommodation holes, the number of which is represented by P/2, and V-shaped accommodation holes, the number of which is represented by P/2, the first accommodation holes extending in radial directions of the rotor core, the V-shaped accommodation holes protruding radially outward, wherein the first accommodation holes and the V-shaped accommodation holes are arranged alternately in the circumferential direction, each V-shaped accommodation hole has a second accommodation hole and a third accommodation hole corresponding to two straight lines forming the V shape, and each first accommodation hole is adjacent to a second accommodation hole on one side in the circumferential direction and adjacent to a third accommodation hole on the other side, wherein the magnets include first magnets disposed in the first accommodation holes, second magnets disposed in the second accommodation holes, and third magnets disposed in the third accommodation holes, and each first magnet and the second magnet adjacent to the same first magnet constitute one magnetic pole, and each first magnet and the third magnet adjacent to the same first magnet constitute another magnetic pole, and wherein the rotor core has grooves at positions corresponding to the first accommodation holes on the outer periphery of the rotor core, each groove has a width as a dimension in the circumferential direction when viewed from the axial direction, each first magnet has a width as a dimension in the circumferential direction when viewed from the axial direction, and the width of the grooves is larger than the width of the first magnets, and wherein, in each first accommodation hole, a projection extending in a direction orthogonal to a radial direction of the rotor core is provided, and wherein each projection restricts the first magnet accommodated in the corresponding first accommodation hole from moving radially outward.