Permanent magnet embedded motor and compressor, blower, and refrigerating and air conditioning apparatus using permanent magnet embedded motor

A permanent magnet embedded motor comprising:

• a stator in which a plurality of teeth sections, around which stator winding is wound, are arranged in a circumferential direction at equal angle intervals via slot sections;
• and
• a rotor in which a plurality of permanent magnets are embedded at the equal angle intervals in the circumferential direction, the rotor being rotatably held on an inner circumferential surface of the stator, wherein
• an outer circumferential surface of the rotor is formed by a plurality of divided outer circumferential surfaces divided at the equal angle intervals in the circumferential direction to correspond to the permanent magnets,
• the divided outer circumferential surface is formed by:
• a first curved surface, a radial direction distance of which from an axis of the rotor is maximized in a circumferential direction center of the divided outer circumferential surface, formed from the circumferential center to circumferential direction both ends;
• and
• second curved surfaces formed from the circumferential direction both ends to the circumferential direction center of the divided outer circumferential surface by a substantially fixed arcuate surface having the axis of the rotor as a central axis and crossing the first curved surface, a radial direction distance between the arcuate surface and the inner circumferential surface of the stator being larger than a radial direction distance between the first curved surface and the inner circumferential surface of the stator,
• and
• a distance between both ends of the first curved surface crossing the second curved surface is smaller than width of the permanent magnets in a direction orthogonal to a radial direction in the circumferential direction center of the divided outer circumferential surface.