Patent ID: 7608964

Claim:
A motor comprising: an armature and a field element which are rotatable relative to each other on a rotation axis extending in a first direction, said armature including an armature winding which is placed at a distance in a second direction perpendicular to said first direction, from said rotation axis, and said field element including a plurality of first yoke plates each including one end which faces said armature winding in said first direction and an other end which does not face said armature winding in said first direction, each of said plurality of first yoke plates extending in said second direction, and a magnetic-field creating magnet coupled to adjacent first yoke plates of said plurality of first yoke plates and having a north pole joined to said other end of one of said adjacent first yoke plates, a south pole joined to said other end of the other of said adjacent first yoke plates, and a U-shaped magnetic path which opens to said plurality of first yoke plates, said magnetic-field creating magnet at least locally facing said armature winding in said second direction, the north pole and the south pole of said magnetic-field creating magnet being alternately disposed adjacent each other around said rotation axis on a common axial side of said magnetic-field creating magnet.