Patent ID: 6858960

Claim:
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 1 and an arced outer surface defined by a second radius R 2 and an “effective de-center” value E is at least about 22% of twice the value of the second radius R 2 where the effective de-center value E is defined as E=D−Tm, the difference between the “de-center” distance D, defined as the distance between the origin of the second radius R 2 and the origin of the first radius R 1 , and the maximum thickness Tm of the permanent magnet; and the rotor cross section and stator cross section each uniformly extend the longitudinal length of the rotor and stator.