Patent ID: 6836051
Filing Date: 2004-12-28
Classification: H02K

Abstract:
A motor comprising:a housing; a stator having inner circumference, comprisng: an annular yoke, a plurality of teeth; a stator core having a plurality of slots, each two adjacent teeth having a slot therebetween, with three-phase concentrated winding wires wound around a portion of each of the teeth, said stator having an outer circumferential surface partially in contact with and held by the housing; and a rotor having an axis of rotation and rotatably held in opposed relation to the inner circumference of said stator with a clearance therebetween, and comprising permanent magnets embedded in or on a surface of the rotor; wherein the stator has a plurality of grooves in the outer circumferential surface of the stator and extending parallel to said axis of rotation and throughout the axial thickness of the stator, each of said grooves being radially outward of one of said teeth.