| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a field magneton having high productivity. <P>SOLUTION: A field magneton 1 includes a magnetic field core 2 and a magnetic field magnet 5. The magnetic field magnet 5 is constituted of two permanent magnets 51 and 52, for example. Width of the magnetic field magnet 5 increases with monotonic non-decrease from a center toward both ends. The magnetic field magnet 5 has projections 51a and 52a projected to a side opposite to a rotation shaft P at both ends. An insertion hole 4 into which the magnetic field magnet 5 is inserted is arranged in the magnetic field core 2. The insertion hole 4 has insertion faces 4a and 4b covering magnetic pole faces 5a and 5b of the magnetic field magnet 5, respectively. A distance between the magnetic pole faces 5b of the plurality of magnetic field magnets 5 and a straight line vertical in a radial direction in centers of the magnetic pole faces 5b increases with the monotonic non-decrease from the center of the magnetic pole face 5a toward both the ends. <P>COPYRIGHT: (C)2012,JPO&INPIT |
