Energetic Parameters of Inductors for Induction Heating of Internal Cylindrical Surfaces

Abstract

The paper presents the analysis of the joint influence of the surface effect, the proximity effect, the ring effect and the slot effect and their influence on the resistance and reactance of an inductor placed inside a hollow cylindrical workpiece, as well as their influence on the electrical efficiency and power factor of an “internal inductor-heated hollow workpiece” system. The dependence of the above parameters of the system on the wall thickness of the copper tube used for the inductor, the presence or not of a magnetic concentrator, as well as on various geometrical parameters of inductor and workpiece are presented.