Patent ID: 8344570

Claim:
An interior permanent magnet rotor, comprising: a rotor core in which a plurality of permanent magnets are embedded at predetermined intervals; and first protruding portions and second protruding portions formed on an outer peripheral face of the rotor, wherein each of the first protruding portions opposes a vicinity of a central portion of each of the permanent magnets and has a substantially arc-shaped cross section protruding outward, each of the second protruding portions opposes a vicinity of an end portion of each of the permanent magnets and protrudes outward, one of the first protruding portions and two of the second protruding portions correspond to one of the permanent magnets, each of the second protruding portions has a substantially arc-shaped cross section having a smaller radius of curvature than the substantially arc-shaped cross section of each of the first protruding portions, and a depression is disposed between adjacent one of the first protruding portions and one of the second protruding portions.