| 摘要 |
PURPOSE:To avoid inconvenience such as the attractive force of an armature yields to the external spring load so that the armature stops at an intermediate position by a method wherein armature plates are provided and at the same time a supplement yoke facing one of the plates is provided. CONSTITUTION:The 1st yoke 30 is composed of a left side piece 31 and a right side piece 32 and a level piece 33 and a supplement yoke 34, a permanent magnet 37 and the 2nd yoke 35 are attached to the center part of the level piece 33. Armature plates 40, 41 are provided to both ends of an armature 38 on which a coil 55 is wound and the end part of one (40) of the plates faces the supplement yoke 34. With this configuration, if a current (i) is applied to the coil 55, the flux Y of the coil and the flux X of the magnet are superposed between the plate 40 and the 2nd yoke 35 and between the 1st yoke 30 and the plate 41 and the armature 38 is attracted to W direction. When the plate 40 touches the supplement yoke 34 due to this shifting, the flux of the coil all flows through the plate 40, the supplement yoke 34, the 1st yoke 30 and the plate 41 so that the attractive force of the armature 38 grows rapidly. |
