The Shielding of Permanent Magnets From Transient Magnetic Fields

It has been shown that the problem of protecting permanent magnets from transient magnetic fields has been solved in a unique manner by the use of a new high- speed copper-plating process to apply a high conductivity copper shield over the conventional forged steel magnets. Desirable features of this solution are complete interchangeability between unshielded and shielded magnets; forged steel material is used, which is fairly easy to obtain and on which unlimited operating experience is available.