| 摘要 |
Within a cylindrical yoke of magnetic material are disposed first and second axially spaced coils in concentric relationship therewith. A first permanent magnet is arranged inside the first coil in abutting relation with one of the end plates of the yoke, and a second permanent magnet is arranged inside the second coil in abutting relation with the other end plate. A movable magnetic body is located inside the first and second coils for movement between the first and second permanent magnets. A plunger extends from one end of the movable magnetic body through a permanent magnet and the yoke to the exterior thereof. A current pulse supplied to the first coil causes the movable body to be attracted to the first permanent magnet, and a current pulse supplied to the second coil causes the movable body to be attracted to the second permanent magnet.
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