Patent ID: 7365472

Claim:
An electric generator comprising a plurality of electric generating means each having a magnet composed of even-numbered magnetic poles arranged in the rotation direction of a rotation axis, a coil mounted on the rotation axis, and a yoke composed of iron pieces corresponding to the even-numbered magnetic poles of said magnet which are provided at the outer periphery of the coil and adjacent to the magnetic poles and which are arranged on the same axis as said rotation axis, said plurality of electric generating means being connected for common rotation about the rotation axis, the improvement wherein the respective magnetic poles and the yoke of one electric generating means and that of another, neighboring electric generating means are rotated relatively to balance a force to attract the magnetic poles and the iron pieces constituting the yoke of the one electric generating means with a force to attract the magnetic poles and the iron pieces constituting the yoke of the other, neighboring electric generating means; wherein the iron pieces that constitute the yokes of said plurality of electric generating means comprise a plurality of first iron pieces which are arranged successively in one rotation direction about said rotation axis, and a plurality of second iron pieces, which are as many as the plurality of first iron pieces, which are arranged successively in an opposite direction to that of the first iron pieces, between the adjacent first iron pieces; wherein the positions of the first and the second iron pieces of said plurality of electric generating means, placed adjacent to each other, are displaced with respect to each other in the rotation direction of said rotation axis, and wherein the magnetic poles that constitute the magnets of said plurality of electric generating means, placed adjacent to each other, are aligned in the rotation direction of said rotation axis; and wherein the one electric generating means and the other electric generating means are connected in series.