Patent ID: 6894413

Claim:
A permanent magnet dynamo electric machine comprising: a rotor with a plurality of magnetic poles including permanent magnets; and a stator with armature windings concentratedly wound around teeth, wherein, when number of pole pairs of the rotor is P, diameter of the rotor is D (in meters), spatial harmonic order of a predetermined harmonic component of an armature magnetomotive force of the stator is N (a mechanical angle 360 degrees is a 1-st order), and output of the permanent magnet dynamo electric machine is P out , and D is at least 0.00045P out +1.2, a parameter X (in meters) used to evaluate rate of eddy current loss in the rotor is X =( N+P ) 1.5 N −4 P 2 D, and P, D, and N are selected so that X is smaller than a predetermined value.