Induction Heating Principle

induction heating principle induction heater theory induction heating system

The principle of induction heating by RF electric current is shown in Fig.-1, there an electric conductor such as iron or steel placed in the inductor is heated rapidly by induced eddy current caused by electromagnetic induction, and hysteretic heat loss, which is generated by vibration and friction of each molecule in magnetic material under AC magnetic flux. As RF frequency, which is higher than that of commercial electric power, is used for induction heating, induced current flows only in the limited area near surface of heated material because of skin effect and proximity effect, and heat loss occurs only there by eddy current and hysteretic loss. The skin effect is the phenomenon, which RF electric current flows only in the limited area near surface of conductive material, and proximity effect is the phenomenon, which the primary current in the inductor and the secondary current in the conductive material pull each other because the direction of current is opposite each other, and flows in the limited area near surface where distance is nearest each other.

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principle of induction heating