| 摘要 |
PROBLEM TO BE SOLVED: To effectively utilize a magnetic force of both of an electromagnet and a permanent magnet. SOLUTION: In the compound magnet equipped with a core 11, an electromagnetic coil 13 arranged so as to surround the outer peripheral surface of the core 11, magnetic pole boards 14 attached to both end faces in the axial direction of the core 11 and consisting of a magnetic body, and the permanent magnet 15 for assisting the magnetic force of the electromagnetic coil 13, one of the magnetic pole plates 14 is made thick, while the permanent magnet 15 is arranged so as to straddle the magnetic pole boards 14 and the core 11. COPYRIGHT: (C)2005,JPO&NCIPI
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