Patent ID: 7233093

Claim:
An electric rotating machine, comprising: a stator including a plurality of circumferentially arranged stator teeth; an inner rotor disposed coaxially with the stator inside thereof; an outer rotor disposed coaxially with the stator outside thereof; an inner armature coil group including a plurality of inner armature coils wound on the stator teeth on a side of the inner rotor, the inner armature coil group being energized to drive the inner rotor; and an outer armature coil group including a plurality of outer armature coils wound on the stator teeth on a side of the outer rotor, the outer armature coil group being energized to drive the outer rotor; the inner armature coil group and the outer armature coil group having electric connections between the plurality of inner armature coils and between the plurality of outer armature coils so as to prevent occurrence of magnetic interference between the inner armature coil group and the outer armature coil group, respectively, wherein the plurality of outer armature coils include a plurality of pairs of outer armature coils wound in a same direction, each pair of outer armature coils being connected with each other and supplied with a same phase current, the plurality of inner armature coils including a plurality of pairs of inner armature coils wound in directions reverse to each other, each pair of inner armature coils being connected with each other and supplied with a same phase current.