| 摘要 |
A permanent magnet type motor having a stator which comprises a yoke, a plurality of main magnetic poles made of permanent magnets, and a plurality of auxiliary magnetic poles, each of the main magnetic poles and each of the auxiliary magnetic poles being juxtaposed on the inner peripheral surface of the yoke, wherein each of the auxiliary magnetic poles has an axial length larger than the thickness of an armature core and smaller than the axial length of each of the main magnetic poles, wherein each of the main magnetic poles has an inner diameter smaller than the inner diameter of each of the auxiliary magnetic poles, wherein each of the main poles, before being secured on the yoke, is machined to have the inner diameter smaller than the predetermined inner diameter by a thickness to be machined, and wherein each of the main magnetic poles is machined to have the predetermined inner diameter after it has been secured together with each of the auxiliary magnetic poles onto the yoke.
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