The Prediction of Current Distribution in Induction Heating Installations

This paper describes a coupled equivalent circuit approach for predicting the current distribution in three-dimensional geometries having axial symmetry. Specimens of arbitrary cross section can be handled by this numerical method so long as they have circular symmetry about the coil axis. Several self-inductance and mutual inductance formulas are investigated, and the merits of these formulas for calculating the parameters for the equivalent circuit are compared. Experimental and theoretical results are compared for a variety of geometries. Current density probes were used to obtain the experimental results.