Question

What is a magnetic keeper? why it is used?

Answer 1

A magnet keeper, also known historically as an 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 important for magnets that 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.

Most magnets do not need a keeper, only those with low coercivity, meaning that they are easily susceptible to stray fields.

Answer 2

a magnetic keeper is a case in which a magnet is stored when it is not in use for a long time. it's usually made of some non magnetic material like copper or aluminum or plastic . it's used to protect the magnet from heat and water it's used to preserve magnetic strength