| 摘要 |
PURPOSE:To contrive the saving of space for observing current characteristics of a control system by providing an iron core or coil of a current detecting element of a control circuit together with an iron core or coil of an electromagnetic force applied device. CONSTITUTION:A Hall element 3 is attached to the position where a flow 5 of magnetic flux which is formed when a coil 13 of an electromagnet 10 is energized for example, to a recess 11a formed at the edge plane of a fixed side 11 of the electromagnet 10. When a current from a power source 1 for a control circuit flows into the coil 13 of the electromagnet 10, an electromagnetic attraction force is produced at first and this force attracts a movable side 12 of the electromagnet 10 to a fixed side 11 and moves a plunger 14. At this time, as the flow 5 of magnetic flux has been formed in the coil 13, a voltage V is produced in the Hall element 3 by the magnetic flux flow 5. Then, it is detected that the control circuit and the electromagnet 10 have been energized. |
