| 摘要 |
<p>PURPOSE:To simplify the matching of a matching spring by a method wherein the characteristics of non-excitation attracting force of electromagnetic circuits located on the left and right sides is unbalanced, and the attracting force of one of them is made larger, thereby enabling to widen the range of fluctuation of attracting force between non-excited and excited states. CONSTITUTION:A recessed part 18a corresponding to the protruded part 16c of a plunger 16 is formed on the left side fixed core 18, and the armature area of said core 18 is made larger than that of the right side fixed core 19. In the left and the right magnetic circuits Y1 and Y2 wherein a permanent magnet 20 is used, the quantity of magnetic flux of the left side magnetic gap (b) is in excess of that of the right side magnetic gap (c), and the plunger 16 is attracted to the left side fixed core 18. When the prescribed voltage is applied to the left and right side exciting coils 24 and 25 in such a manner that the starting magnetic flux reverse to the direction of the starting magnetic flux of the left side magnetic circuit will be generated, the plunger 16 moves to the direction W shown by an arrow in the diagram. Pertaining to the attracting force-stroke characteristics of the plunger, the difference in attracting force between non-excitation characteristics and excitation characteristics is made larger, thereby enabling to simplify the matching of a matching spring when a contact point is constituted.</p> |
