JPS6455809A - Electromagnet device - Google Patents

Abstract

PURPOSE:To realize a reduction in a noise without restriction, such as a reduction in the displacement of an armature by so deforming an elastic material that the contacting face with the armature or a yoke becomes the same plane as that of the end face of the yoke or the contacting face of the armature and to bury an enlarged part when the armature is attracted to the end face of the yoke to be contacted. CONSTITUTION:When a coil 2 is energized in a nonexciting state, the magnetic fluxes of a permanent magnet 5 and the coil 2 cancel each other to be superposed to rotate an armature 3 clockwise, and a contacting face Tb is brought into contact with the other end 6b of an elastic material 6. From there, the other end 6b of the material 6 is so elastically deformed as to bury an enlarged part 1b due to the contacting face Tb having an increased attracting force. Then, the face 6b is attracted closely to the end face Eb of a yoke. Simultaneously, the material 6 moves in a through hole 1e while recovering its shape to protrude one end 6a from the end face Ea. Thereafter, in order to reversely rotate the armature 3, the coil 2 is so excited that the magnetic flux due to the coil 2 becomes reverse. Thus, the material 6 alleviates to attract the impact energy of the armature 3. Further, it is not restricted in the displacement of the armature 3.