Analysis On Eddy Current Field Of Traveling Wave Induction Heating

Traveling Wave Induction Heating (TWIH), involving three-dimensional non-liner coupled problem of eddy current field and temperature field for continuously moving strip, has particular features which make them attractive for application to some heating and melting processes in industry. Among the advantages we can mention the possibility to heat quite uniformly thin strips or regions of a body without moving the inductor above its surface, to reduce the vibrations of inductor and load due to the electro-dynamic forces and also the noise provoked by them, to obtain nearly balanced distributions of power and temperatureThe characteristic, development and present research situation of induction heating are briefly introduced. The background of this project, the main contents and the significance of this paper are mentioned. And the electromagnetic field value computational method is introduced. A mathematical model is developed to describe the distribution of electromagnetic field and eddy current density in the strip. The mathematical modal of electromagnetic fields is presented by a magnetic vector potential, which is also applied to solve eddy current field in ANSYS. And the analytical simulating methods for induction heating are represented.Mathematical model is offered for solving the coupled problem for TWIH. To improve the efficiency of eddy current field calculation, necessary simplification is applied and boundary conditions are accurately analyzed. The magnetic force and the final eddy current distribution demonstrated and analyzed. And the computation of power density distribution in the strip has analyzed under different power source frequency, different air gap size, different primary position as well as different coil structure, which is based on ANSYS software. Comparison of edge-effects of traveling wave and transverse flux induction heating is done.A single-coil model is applied to do basic three-dimensional study, and deduce the effect of coil structure and arrangement for the eddy current distributions. With the results, as well as the equivalent circuit and ANSYS simulation model, we get some rules about what mainly influences the distribution of inducting eddy current.