Estimating Method of Heat Distribution Using 3-D Resistance Matrix for Zone-Control Induction Heating Systems

This paper focuses on the analysis and control of the heat distribution in zone-control induction heating (ZCIH) systems, which consist of two or more split working coils and inverter units. This paper carries out theoretical analysis of the generated heat in the workpiece and reveals a relationship between the coil currents and the heat distribution. As a result, it is determined that the heat distribution can be estimated by a simple calculation using a 3-D resistance matrix. The experimental results which use a six-zone ZCIH laboratory setup, verify the validity of the developed theory.