Patent ID: 6858960
Filing Date: 2005-02-22
Classification: H02K

Abstract:
1. A permanent magnetic motor comprising: a stator having a cross section defining an inner cylindrical surface, a plurality of uniformly distributed and spaced apart stator poles that extend radially inward from the inner surface and terminate at an end defined by an inner pole face, each end separated from an adjacent end by a distance defined as a stator slot width W; a rotor having a longitudinally extending rotatable shaft radially inward of the stator inner cylindrical surface and defining an axis of rotation, a cross section including a plurality of spaced apart permanent magnets carried by the shaft and angularly distributed about the shaft, the outer most point on the cross section of each permanent magnet is separated radially from the inner pole faces by a distance defined as a minimum magnetic air gap G; a defined ratio of the stator slot width W to air gap G that is defined to be about equal to or lower than 1.66; wherein each permanent magnet has an arced inner surface defined by a first radius R the rotor cross section and stator cross section each uniformly extend the longitudinal length of the rotor and stator.