| 摘要 |
PURPOSE:To make it possible to utilize magnetic flux effectively for separation of a movable iron core by a method wherein a magnetic reversion means, which forms the second magnetic path to be used to separate the movable core from a fixed core, is provided in the vicinity of the movable core. CONSTITUTION:In the state wherein a movable core 26 is attracted to a fixed core 24, effective attraction can be obtained by introducing the magnetic flux 37 coming from a permanent magnet 31 to the first magnetic path where the movable core 26 and the fixed core 24 are attracted. Also, when the movable core 26 is separated from the fixed core 24, most of the magnetic field passing through the first magnetic path 37 passes the second magnetic path by introducing most of the magnetic flux 37 coming from the permanent magnet 31 into the second magnetic path returning to the permanent magnet 31 again passing a magnetic reversion means 32 by using the surface opposing to the permanent magnet 31 of the magnetic reversion means 32 as the opposite electrode of the electrode of the permanent magnet 31. Consequently, the attracting force of the movable core 26 and the fixed core 24 is reduced to a high degree, and they are separated.
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