Embedded permanent magnet rotary electric machine

An embedded permanent magnet rotary electric machine comprising:

• a stator including:
• an annular stator core;
• and
• a stator coil that is mounted onto said stator core;
• and
• a rotor including:
• a cylindrical rotor core;
• and
• a plurality of permanent magnets that constitute respective single magnetic poles that are embedded into an outer circumferential side of said rotor core so as to be arranged at a uniform angular pitch circumferentially,
• said rotor being rotatably disposed on an inner circumferential side of said stator,
• wherein:
• said permanent magnets that constitute said single magnetic poles are constituted by n permanent magnet segments that are arranged in a circular arc shape circumferentially, where n is an integer that is greater than or equal to 3;
• said n permanent magnet segments are individually accommodated and held in magnet holding apertures that are disposed through said rotor core so as to have aperture directions in an axial direction;
• said n permanent magnet segments are configured such that shapes and directions of orientation thereof have minor symmetry relative to a plane that passes through a magnetic pole center and that includes a central axis of said rotor core;
• said n permanent magnet segments are oriented such that a permanent magnet segment that is further away from said magnetic pole center in a circumferential direction has a smaller angle of orientation;
• and
• said permanent magnet segment that is positioned further away from said magnetic pole center in said circumferential direction is produced so as to have an approximately fan-shaped cross-sectional shape in which a radial width is wider than a circumferential width.