Patent ID: 7417346

Claim:
A permanent magnet rotating electric machine for vehicle comprising a stator, a rotor rotatably arranged inside said stator, and a magnetic pole position detector, wherein: said stator includes, a stator core which forms slots in an inner surface side thereof over whole inner surface thereof, and stator winding set in three-phase distributed winding to said stator core; said rotor includes, a rotor core in which a plurality of poles are equiangularly formed, and a plurality of permanent magnets arranged in said rotor core to form said plurality of poles; said rotor core includes a first air gap located in the center portion of each of said plurality of poles and having a first surface formed inside and along an outer surface of said rotor core and symmetrically extending in a circumferential direction from a center of said pole, width of a radial direction at a center portion in said air gap being larger than that of a portion circumferentially distant from the center portion, said rotor core includes two permanent-magnet-inserting holes in which said two permanent magnets forming each of the poles are inserted, said two permanent-magnet-inserting holes being formed in plane symmetry to a plane passing through the center of the pole and the rotation axis, formed so that the nearer the rotation axis, portions of said two permanent magnets come nearer mutually, and extended in the direction of the rotation axis, said plurality of permanent magnets alternately magnetized in reverse polarity every pole, each of said permanent magnets are divided into a plurality of magnetic pieces in a direction of a rotation axis of said rotor, and said divided magnetic pieces are arranged to be shifted in a direction of the circumferential direction each other, said rotor core includes a second air gap formed in plane symmetry to the plane, between rotation-axis-side ends of said permanent magnets inserted into said two permanent-magnet-inserting holes; and three-phase AC is applied to said stator winding to generate rotary torque based on torque by said permanent magnets and reluctance torque.