Patent ID: 6528920
Filing Date: 2003-03-04
Classification: H02K,Y02T

Abstract:
A permanent magnet rotary machine, comprising a stator having a stator winding, and a rotor arranged rotatively in an inner periphery of said stator through a rotation air space and in which plural permanent magnets are buried with a circumferential shape in an inner portion of an iron core, said respective permanent magnet has one permanent magnet selected from one of a block shape permanent magnet, a trapezoid shape permanent magnet and an arc shape permanent magnet in which a convex portion of said permanent magnet directs for a side of said stator, whereinat least one groove is provided on a portion between an outer face in a peripheral direction width of said permanent magnet and an outer peripheral portion of said iron core, and said groove generates a magnetic fluctuation for reducing a cogging torque which is generated during rotation of said rotor.