| 摘要 |
PROBLEM TO BE SOLVED: To reduce the impact speed of two iron cores when the movable iron core is attracted. SOLUTION: Magnetism leaking parts 4a and 4b are provided in a stationary iron core 4 in one piece so as to extend upright by the side of a movable iron core 5 through the intermediary of gaps g and j, and a part of the magnetic flux of the electromagnetic coil is guided to the magnetism leaking parts 4a and 4b. The attraction, which is generated by a leakage magnetic flux passing through the leaking parts 4a and 4b, has a component vertical to the direction of movement of the movable iron core 5, so that the attraction is restrained when the iron cores impinge on each other, and the attraction and the load match well each other, so that the impact speed of the iron cores can be reduced to decrease the shock. When the iron cores are brought into contact with each other, a magnetic reluctance between the contacting pole faces of the iron cores is smaller than those of the magnetism leaking parts 4a and 4b, so that a magnetic flux stops passing through the parts 4a and 4b, and a coercive force is kept as well as usual when the cores are brought into contact with each other. COPYRIGHT: (C)2004,JPO
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