| 摘要 |
The present invention is to provide a magnet device with double fixing positions for changing the magnetic circuit, comprising: an external housing whose inner edge is fitted with a coil, whereby the inside of said external housing includes a space for the axial movement of a iron core; characterized in that said external housing and a positioning cover at the opening end thereof are made of metal with excellent magnetic conductivity, and that said iron core is connected to a permanent magnet which is fixed at the inner side of said positioning cover, and that a drive circuit 6 is installed, whereby a positive impulse voltage will be exported and the electrical energy is saved into the capacitor when the power is switched on, while a discharge current is created to export a negative impulse voltage after the power is switched off, and that the positive and the negative impulse voltage serves to make said coil to change the direction of the magnetic force by the excited process so that a push force or a pull force to said iron core will be created for movement thereof, and whereby said permanent magnet will be forced to change the magnetic circuit and said iron core under ordinary circumstances will be kept at the pre-arranged position without continuous waste of electricity, and that not only can this save the electric energy, won't result in an over-heated state or the short circuit to be burnt down, but also prevent from danger and extend the useful life.
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