Research On Field-circuit Coupling Of The Medium Frequency Induction Heating

With the improvement of the industrial production requirements, the performance and reliability of the metal parts is becoming a growing concern, however, on one hand, the quality and performance indicators of metal parts are related to material characteristics, on the other hand, they are more closely related to the heating technology. Currently, the induction heating is widely used for the processing and heat treatment of the metal parts, because it has a high treating efficiency and easy control, etc. The improvement of the induction heating theory, optimization of the induction heating devices and in-depth study of the induction heating process are essential for the development of induction heating technology. Induction heating theory has been in constant development, tending to improvement, meanwhile, optimization of the induction heating apparatus can not be separated from study of the induction heating process. This article is based on related principle of the induction heating, by using the finite element method, achieving a numerical simulation of the induction heating, completing the analysis of the electromagnetic、eddy current field and temperature field coupling of the induction heater and workpiece. With the help of ANSYS and ANSOFT software, the temperature distribution and eddy current distribution on the workpiece in different sizes and frequencies excitation can be obtained, while understanding the heating time’s influence on the inducting heating results, furthermore, the equivalent parameters of the wokpiece at different temperature, i.e., the equivalent resistance and inductance of the load branch of the induction heating power supply, can be calculated. After analyzing the above induction heating parameters’ impact on the simulation results. The conclusions that has a engineering reference value can be achieved, then a theoretical basis for reasonably choosing heating parameters can be provided, besides, a practical guidance for the reasonable choice of the power and frequency of the induction heating power supply and its design and optimization can be got, the quality of the induction heating power supply can directly determines the degree of idealization of heating results, the equivalent load of the induction heating power supply is an inductive load, in order to counteract the effects of reactive power, there is a need to increase compensation capacitor to load branch, improving the utilization of the power, at the same time, power to work in small detuning emotional state is required. Such the power can not only output maximum active power to the load, but the power switching devices can work in soft-switching state, reducing device loss, the design of the induction heating power supply can not be separated from the power regulation and load frequency tracking, selecting appropriate way to adjust power and further improvement in phase-locked loop technology will greatly improve the power performance index.