Patent ID: 7576466
Filing Date: 2009-08-18
Classification: H02K

Abstract:
1. An electric motor comprising: a stator having a circumferential periphery on which a plurality of stator poles are disposed at circumferentially spaced intervals, each of the stator poles including a magnetic body segment extending along an axis of the stator and a non-magnetic body segment; and a rotor rotatable in face-to-face relationship with the stator and having an outer periphery facing the circumferential periphery of the stator, wherein the stator includes magnetic reluctance equalizing means associated with the stator poles, respectively, and the magnetic reluctance equalizing means include the magnetic body segments and the non-magnetic body segments disposed in axial ends of the magnetic body segments at areas minimizing variation in magnetic body ratios of the magnetic body segments along the circumferential periphery of the stator to minimize a difference in magnetic reluctance along the circumferential periphery of the stator.