Magnet core, process for producing a magnet core and residual current device

摘要

The invention relates to a magnetic core made from a wound soft magnetic strip, for low frequency applications designed to have an increased relative permeability žr by means of reduced mechanical tensions. The above is achieved by means of coating at least one side of the soft magnetic strip with a static friction reducing material which is partly burnt off during the thermal treatment of the magnetic core. The residue thereof remains such that in cross-section the magnetic core has an alternating layer of soft magnetic material and a layer of residue of a static friction reducing material.