| 摘要 |
PROBLEM TO BE SOLVED: To make the high-speed operation of a plunger by increasing an attraction force at a small current flow in an electromagnet. SOLUTION: The fixed iron core 2 of the electromagnet 1 consists of a plurality of side legs 5 arranged between an upper iron core 3 and a lower iron core 4, and a central iron core leg 6 which is integrally formed with the upper iron core so as to be extended in a direction from the upper iron core 3 toward the lower iron core 4 between the side legs 5. The plunger 7 is passed through a passage 8 formed in the lower iron core opposite to the central iron core leg 6, and is connected and disconnected to the tip 6A of the central leg by magnetic attraction force. Inside the fixed iron core 2, a magnetic flux generating means 10 for magnetically driving the plunger is arranged. A cross-sectional area of the central iron core leg 6 is made larger than that of the plunger 7. COPYRIGHT: (C)2006,JPO&NCIPI
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