| 摘要 |
A magnetic holding device is provided that includes at least one electromagnet assembly for selectively switching a holding portion for a magnetic substance into an excited state or an unexcited state; and a permanent magnet for selectively keeping the holding portion in an excited state or an unexcited state in cooperation with the electromagnet assembly. The at electromagnet assembly has a housing provided with a cylindrical portion and a yoke portion disposed at one end of the cylindrical portion and magnetically connected to the cylindrical portion; a magnetic cavity acting as a magnetic leakage path of a magnetic flux from the permanent magnet when the holding portion is maintained in an unexcited state; an iron core disposed in the housing; an exciting coil for generating a magnetic field that acts on the iron core and selectively switches the holding portion into an excited state or an unexcited state in cooperation with the permanent magnet; and adjustment means for adjusting the size of the magnetic cavity.
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