| 摘要 |
PROBLEM TO BE SOLVED: To prevent demagnetization of magnets. SOLUTION: A magnetic field element 1a can rotate around a rotating shaft 92 along a predetermined direction 91, and has a plurality of magnets 11, magnetic plates 21, and joints 3. The magnets 11 are disposed in an annular state around the rotating shaft 92 along a circumferential direction 93 and separated to each other. Each magnet 11 has the first and second pole surfaces 11a, 11b which provide different poles to each other in the predetermined direction 91. Each of the pole surfaces 11a, 11b which are positioned on the same side in the predetermined direction 91 of each adjacent magnet 11 in the circumferential direction 93 has different poles to each other. Each magnetic plate 21 is provided with one adjacent magnet 11 in the circumferential direction 93, and provided on different side from each other relative to the magnet 11 in the predetermined direction 91. The joint 3 is made of non-magnetic material, and is jointed to the magnetic fields 2 which are composed of the magnets 11 and the magnetic plates 21 provided at the magnets 11 with each other. COPYRIGHT: (C)2008,JPO&INPIT
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