COMB-LIKE SLIT LAMINATED YOKE FOR A TRAVELLING-MAGNETIC-FIELD INDUCTOR FOR REHEATING METAL STRIP

摘要

Yoke formed by stacking magnetic laminations (4) that have edge notches (7) which are mutually parallel and have open lips, these being localized at least at the angular ends of the inductor. These notches are preferably spaced apart by a few mm, but the separating interval may be greater, from 1 cm and beyond, without however exceeding about 5 cm. They start on the sheet border and extend, preferably along a straight line, towards the interior over a distance that depends on the environment of the inductor. The notches are produced by removing material so that each notch (7) has non-contiguous lips (and therefore with open lips), even preferably at discrete points, so as to avoid offering bridges to the circulation of eddy currents thereat. The invention applies to the production of heating inductors, whereby it controls the thermal behaviour of the inductors by simple means preventing them from overheating.