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| magnet keeper ： ウィキペディア英語版 |
magnet keeper
A magnet keeper, or armature is a ferromagnetic bar made from soft iron or steel which is placed across the poles of a permanent magnet to help preserve the strength of the magnet by completing the magnetic circuit; it is particularly useful for magnets which have a low magnetic coercivity, such as Alnico magnets.
Keepers also have a useful safety function as they stop external metal being attracted to the magnet.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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