Patent ID: 6992412
Filing Date: 2006-01-31
Classification: H02K

Abstract:
1. A rotary electric machine, comprising: a housing; and an armature having a shaft rotatably supported in the housing and an armature core fixedly connected to the shaft, wherein: the armature core is formed by laminating a plurality of core sheets, each core sheet having a center hole and outer holes connected to the center hole with no intervening material therebetween wherein the core sheets are laminated so that the outer holes of the core sheets communicate with one another, thereby forming air passages in the armature core in the axial direction thereof, and the laminated core sheets are divided into a predetermined number of blocks; and the outer holes of the core sheets are positioned at a same position in each block and are shifted block by block by a predetermined angle around the axial direction, thereby forming air passages skewed block by block relative to the axial direction in the armature core.