Magnet keeper: Difference between revisions
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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. |
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. A magnetic keeper is made up of aluminium because aluminium is a ferromagnetic substance so the magnet will not attract the magnet and weaken it's properties. |
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Keepers also have a useful safety function as they stop external metal being attracted to the magnet. |
Keepers also have a useful safety function as they stop external metal being attracted to the magnet. |
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Revision as of 06:21, 26 January 2016
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. A magnetic keeper is made up of aluminium because aluminium is a ferromagnetic substance so the magnet will not attract the magnet and weaken it's properties.
Keepers also have a useful safety function as they stop external metal being attracted to the magnet.
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