Patent ID: 9117584
Filing Date: 2015-08-25
Classification: H01F,H01H

Abstract:
1. A solenoid device comprising: a first magnetic coil and a second magnetic coil which are energized to produce magnetic fluxes; a first plunger which is moved frontward or backward by energization of the first magnetic coil; a second plunger which is moved frontward or backward by energization of the second magnetic coil; a first stationary core which is disposed so as to face the first plunger in a frontward/backward movement direction of the first plunger; a second stationary core which is disposed so as to face the second plunger in a frontward/backward movement direction of the second plunger; and a yoke which is disposed outside the first and second magnetic coils, wherein in a dual-deenergized mode in which the above two magnetic coils are both deenergized, gaps are created between the first plunger and the first stationary core and between the second plunger and the second stationary core, wherein when the first magnetic coil is energized, the magnetic flux of the first magnetic coil flows through a first magnetic circuit which includes only the first stationary core, thereby producing a magnetic force which attracts the first plunger to the first stationary core, wherein when the second magnetic coil is energized, the magnetic flux of the second magnetic coil flows through a second magnetic circuit which includes only the second stationary core, thereby producing a magnetic force which attracts the second plunger to the second stationary core, wherein in a dual-energized mode in which the above two magnetic coils are both energized, the magnetic fluxes of the two magnetic coils flow through the first and second magnetic circuits, thereby producing a magnetic force which attracts the first and second plungers, and a portion of the magnetic flux of the first magnetic coil flows through a third magnetic circuit which includes the above two stationary cores, wherein when the second magnetic coil is deenergized while the first magnetic coil is kept energized following the dual-energized mode, the magnetic flux of the first magnetic coil flows through the first magnetic circuit and the third magnetic circuit, thereby producing magnetic forces to maintain a dual-attracting mode in which the first plunger is attracted to the first stationary core, and the second plunger is attracted to the second stationary core, and wherein the first magnetic circuit has formed therein a first magnetically-saturated portion where the magnetic flux flowing through the first magnetic circuit is saturated.