Electric generator

Abstract

An electric generator 10 of the present invention comprises a permanent magnet 14 , a coil 30 , a yoke 20 , and attracted means 19 composed of a plurality of attracted pieces 18 which are arranged radially around the rotation axis 12 and are magnetized by the permanent magnet 14 . The permanent magnet 14 , the coil 30 , the yoke 20 , and the attracted means 19 are mounted on the rotation axis 12 and the attracted pieces 18 that constitute the attracted means 19 are each placed in positions that correspond to positions that bisect the spaces between the metal pieces that constitute the yoke 20 , so that the cogging torque exerted on the rotation axis 12 is reduced.

1 .- 20 . (canceled)  
   
   
       21 . An electric generator comprising a plurality of electric generating means having a magnet composed of even-numbered magnetic poles arranged in the rotation direction of a rotation axis and a yoke composed of iron pieces corresponding to the even-numbered magnetic poles of said magnet which are adjacent to the magnetic poles, which is arranged on the same axis as said rotation axis, said plurality of electric generating means being connected by the rotation axis, 
 wherein respective magnets and yokes of one electric generating means and other neighboring electric generating means are rotated relatively to balance a force to attract the magnet and the iron pieces constituting the yoke that compose the one electric generating means with a force to attract the magnet and the iron pieces constituting the yoke that compose the other neighboring electric generating means.    
   
   
       22 . The electric generator according to  claim 21 , wherein the positions of said iron pieces of said plurality of electric generating means placed adjacent to each other are out of phase in the rotation direction of said rotation axis, and wherein the magnetic poles that constitute said magnet of the plurality of electric generating means placed adjacent to each other are in polarity phases in the rotation direction of said rotation axis.  
   
   
       23 . The electric generator according to  claim 22 , wherein said magnet is shared by said plurality of electric generating means.  
   
   
       24 . The electric generator according to  claim 21 , wherein the positions of said iron pieces of said plurality of electric generating means placed adjacent to each other are in phase in the rotation direction of said rotation axis, and wherein the magnetic poles that constitute said magnet of the plurality of electric generating means placed adjacent to each other are out of polarity phase in the rotation direction of said rotation axis.  
   
   
       25 . The electric generator according to  claim 21 , wherein the iron pieces that constitute a yoke of said electric generating means comprise a plurality of first iron pieces which extend to one direction of said rotation axis; and a plurality of second iron pieces which are as many as the plurality of first iron pieces extending to an opposite direction to the first iron pieces between the adjacent first iron pieces.  
   
   
       26 . The electric generator according to  claim 25 , wherein the positions of the first and the second iron pieces of said plurality of electric generating means placed adjacent to each other are out of phase in the rotation direction of said rotation axis, and wherein the magnetic poles that constitute the magnet of the plurality of electric generating means placed adjacent to each other are in polarity phase in the rotation direction of said rotation axis.  
   
   
       27 . The electric generator according to  claim 25 , wherein said magnet is shared by said plurality of electric generating means.  
   
   
       28 . The electric generator according to  claim 25 , wherein the positions of the first and the second iron pieces of said plurality of electric generating means placed adjacent to each other are in phase in the rotation direction of said rotation axis, and wherein the magnetic poles of the plurality of electric generating means placed adjacent to each other are out of polarity phase in the rotation direction of said rotation axis.