| 摘要 |
PURPOSE:To increase the magnetic flux in high density by concentrating the magnetic flux of the first magnet by the magnetically repelling force of the second and third magnets disposed so that the polarities coincide through nonmagnetic units at the inside and outside of the first magnet formed in a horseshoe shape with lateral N- and S-poles. CONSTITUTION:Poles 10 secured in a case 20 are so provided at the inside and outside of the first magnet 11 of arc shape that N- and S-poles are disposed laterally through plastic plates 12, 13 that the second and third magnets 14, 15 of arc shape coincide in the polarity. The adjacent magnets 10 are disposed so that the opposite poles are disposed adjacently. An armature is composed of a rectangular coil 19 wound on a supporting frame 18 secured to a rotational shaft 17. Thus, since the magnetic flux of the magnet 11 is concentrated in an arc shape for coupling the both poles by the magnetically repelling force of the magnets 14, 15, the magnetic flux becomes high density. |
