Embedded permanent magnet electric motor

An embedded permanent magnet electric motor comprising:

• a rotor comprising:
• a rotor core that has an outer circumferential surface that is formed into a plurality of continuous convex surfaces by arranging circular arc-shaped curved surfaces at a uniform angular pitch circumferentially, and
• a plurality of permanent magnets that are embedded in said rotor core so as to be positioned on a radially inner side of each of said circular arc-shaped curved surfaces,
• said permanent magnets that are embedded in inner radial sides of adjacent circular arc-shaped curved surfaces being magnetized so as to have polarities that are different than each other to constitute magnetic poles;
• and
• a stator comprising:
• a stator core in which teeth are respectively disposed so as to extend radially inward from an annular core back and are arranged at a uniform angular pitch circumferentially to configure open slots;
• and
• a stator coil that is constituted by a plurality of concentrated winding coils that are wound into concentrated windings on each of said teeth,
• said stator being disposed so as to surround said rotor.