Patent ID: 8350434
Filing Date: 2013-01-08
Classification: H02K,Y02E

Abstract:
1. A permanent magnet type rotary electric machine comprising: a stator; and a rotor that is born in free of rotation with respect to the stator via an air gap, and in which an even number of cooling use ventilation passages extending in axial direction are formed in a rotor core of the rotor along the circumferential direction with an interval, and an even number of magnetic poles constituted by burying permanent magnets in the rotor core between the adjacent cooling use ventilation passages along the circumferential direction, and the rotor is rotated in one direction, wherein the outer circumference of the respective magnetic poles of even number is formed in a circular arc, the circular arc of each of the respective magnetic poles having a same curvature, and a magnetic pole center axes of the respective magnetic poles are displaced with respect to the rotation center of the rotor so that the gap between the stator and the respective magnetic pole outer circumferences at the rear end side in the rotating direction is widened in comparison with the gap at the top end side.