| 摘要 |
A control system for an electromagnet provided with a power winding controlling the motion of the movable core and with a maintenance winding holding the core in its attracted condition. The power winding is first energized through a first thyristor (a silicon controlled rectifier, generally designated SCR) or transistor by a closing of a rough rectified A.C. circuit and, after a short delay, a condenser discharges through a component provided with a threshold for voltage conduction into an electrode controlling another thyristor or transistor or the like means which energizes then the maintenance winding and provides for the release or the first thyristor or transistor so as to deenergize the power winding. The maintenance winding remains then energized until the rectified circuit is switched off.
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