CALCULATION OF THE TRANSIENT TEMPERATURE DISTRIBUTION IN A TFIH DEVICE USING THE IMPEDANCE BOUNDARY-CONDITION

This paper presents a method of alternately switched coils in transver se flux inductive heating devices (TFIH) and their finite element form ulation in order to improve temperature distribution. In the present p aper the application of the boundary impedance method in eddy-current computation in thin conducting sheets is combined with the transient c alculation of the resulting temperature distribution. In this non-line ar coupled electromagneto-thermal problem the (T) over right arrow,Ome ga formulation is used to calculate the time-harmonic electromagnetic field. The Fourier's thermal conduction equation is extended by terms for conduction, convection and radiation. In addition a quasi steady s tate formulation for high switching frequencies is introduced.