Permanent Magnet Rotating Electric Machine and Electric Car Using the Same

Abstract

A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.

What is claimed is: 
     
         1 . A permanent magnet rotating electric machine comprising a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which polarity is alternately arranged in a peripheral direction in a rotor iron core, wherein:
 said iron core of said permanent magnet rotor is composed of   magnetic pole pieces positioned on an air gap face of said permanent magnets for forming a magnetic path of said permanent magnets,   auxiliary magnetic poles projected up to said air gap face of said permanent magnets for producing reluctant torque, and   a stator yoke positioned on a reversed air gap face of said permanent magnets for forming a magnetic path of said auxiliary salient poles and said permanent magnets, and further includes:   concavities formed on said air gap face of said magnetic pole pieces of said rotor iron core of said permanent magnets, gently tilting from a central part of said magnetic poles to an end thereof.