Patent ID: 7679256

Claim:
A rotary electric machine comprising: a rotor having a first rotor magnetic pole section magnetized in a radial direction and a second rotor magnetic pole section magnetized in a rotating axis direction; and a stator having a first stator magnetic pole section which is provided corresponding to the first rotor magnetic pole section to generate magnetic flux along the radial direction and a second stator magnetic pole section which is provided corresponding to the second rotor magnetic pole section to generate magnetic flux along the rotating axis direction, wherein the rotor rotates freely relative to the stator upon receiving, at the first and second rotor magnetic pole sections, the magnetic flux from the respective first and second stator magnetic pole sections; the first stator magnetic pole section comprises, a plurality of first cores arranged along a circumferential direction of the rotor, and a plurality of first coils disposed corresponding to the plurality of first cores, each of the plurality of first coils being wound around corresponding one of the first cores; the second stator magnetic pole section comprises, a plurality of second cores arranged along the circumferential direction of the rotor, and a plurality of second coils disposed corresponding to the plurality of second cores, each of the plurality of second coils being wound around corresponding one of the second cores; the second cores have a cross sectional area in a plane direction perpendicular to the radial direction of the rotor which is greater than or equal to a cross sectional area of the first cores in a plane direction perpendicular to the rotating axis direction; and when a minimum width of the first cores in the circumferential direction of the rotor is defined as W 1 , the number of windings of the first coils is defined as N 1 , a minimum width of the second cores in the circumferential direction of the rotor is defined as W 2 , and the number of windings of the second coils is defined as N 2 , a relationship of W 2 /N 2 >W 1 /N 1 is satisfied.