Patent ID: 7148597

Claim:
A permanent magnet rotating electric machine comprising: a stator; and a rotor rotatably arranged with a predetermined gap relative to said stator; wherein, said stator comprises a stator core having a plurality of slots and multi-phase stator windings inserted into said plurality of slots; said rotor comprises a rotor core and a plurality of permanent magnets embedded internally into said rotor core; a core shape of said rotor core is uniform in a longitudinal direction; said rotor core includes thereon a plurality of permanent-magnet-inserting holes into which said permanent magnets are embedded and a plurality of magnetic poles configured by said plurality of permanent magnets; one magnetic pole of said plurality of magnetic poles comprises a plurality of said permanent magnets; said plurality of permanent-magnet-inserting holes extend in the longitudinal direction of said rotor core; said plurality of said permanent magnets configuring each of said plurality of magnetic poles are arranged in said permanent-magnet-inserting holes symmetrically with respect to a periphery direction of said rotor but asymmetrically with respect to a longitudinal direction of said rotor; said permanent-magnet-inserting holes are composed of at least three parts divided in the periphery direction of said rotor for each magnetic pole and comprise two permanent-magnet-inserting holes positioned in between-pole sides of the magnetic pole and one permanent-magnet-inserting hole positioned in a pole-center side of the magnetic pole; said two permanent-magnet-inserting holes are formed in said rotor core in such a way that the longitudinal directions of the cross section thereof are in a radius direction of said rotor core; and said one permanent-magnet-inserting hole is formed in said rotor core in such a way that the longitudinal direction of the cross section thereof is in a periphery direction of said rotor core.