Development and Comparison of 3D Nonlinear Electrothermal Models for Induction Heating Problems

The paper describes two methods of 3D coupled-field nonlinear thermal-electrical simulation of induction heating devices. The first one uses multiphysics engineering simulation JMAG software, the second one - specialized Universal 3D program. The simulation results are compared with data obtained from the experiment on ferromagnetic carbon steel thin plate induction heating to the forging temperature using an oval inductor. Particular attention is given to the steel nonlinear magnetic properties approximation at temperatures below the Curie point. The paper also gives an estimation of the simulations speed and accuracy.