Device for inductively heating metallic strips

Abstract

For optimum induction heating of metallic strips ( ) of differing widths—particularly in the edge region—one multicoil transverse field inductor is positioned both above and below the strip ( ) to be heated, whose coil axes are positioned vertically to the strip surface. In this case, each inductor comprises at least one inductor segment ( ), which is constructed as a coil composite of multiple approximately rectangular coils ( ) which extend predominantly transversely to the transport direction of the strip ( ), the coils ( ) having different, stepped transverse extensions and the coil having the highest transverse extension extending at most up to the lateral edges of the widest strip and the coil having the lowest transverse extension extending at most up to the lateral edges of the narrowest strip. Each inductor segment ( ) is connected to a circuit for defined clocking of its coils ( ), and each inductor segment ( ) below the strip is assigned an identical inductor segment ( ) above the strip. Through the device according to the present invention, overheating of the edges of metal strips ( ) is prevented during induction heating—independently of the strip width.