Joule effect heating device for long metal strip - has two cores adjacent strip introducing alternating field perpendicular to main field

摘要

The joule heating technique is for long strips of metal, such as steel billets. The method overcomes the difficulty of providing sufficient heating for the strip edges and the subsequent problems with laminated strip. In order to distribute the joule heating effects to the edges an alternating field is introduced perpendicular to that of the main field by two cores adjacent to the strip. The second field generated may be approximately at the same frequency as the main source but in phase quadrature, at a higher frequency or may be continuous, i.e., derived from a permanent magnet.