Patent ID: 7053513

Claim:
A rotary electric machine comprising: a stator including a plurality of stator coils arranged around a center axis of the rotary electric machine; an inner rotor disposed rotatably inside the stator, the inner rotor including a plurality of inner permanent magnets arranged around the center axis and inclined alternately, and a plurality of outer surface portions serving as a yoke portion of an outer magnetic circuit; and an outer rotor disposed rotatably outside the stator, the outer rotor including a plurality of outer permanent magnets arranged in a circle, and a plurality of outer portions each located on an outer side of each of the outer permanent magnets, and arranged to serve as a yoke portion of an inner magnetic circuit for magnetic flux synchronous with the inner rotor whereas each outer surface portion of the inner rotor is arranged to serve as the yoke portion of the outer magnetic circuit for magnetic flux synchronous with the outer rotor, the inner magnetic circuit being arranged to serve further as a quadrature axis magnetic circuit of the outer rotor, and the outer magnetic circuit being arranged to serve further as a quadrature axis magnetic circuit of the inner rotor; wherein the stator includes a plurality of stator teeth; the outer permanent magnets are arranged circumferentially so that a circumferential distance between adjacent two of the outer permanent magnets is greater than or substantially equal to a minimum circumferential width of the stator teeth; and the inner permanent magnets are inclined alternately so that wider regions and narrower regions are formed alternately in an outer circumference of the inner rotor by the inner permanent magnets, and a circumferential length of the wider regions of the outer circumference of the inner rotor is greater than or equal to a double of the circumferential distance among the outer permanent magnets.