Induction heater coils themselves do not get hot because they are water-cooled copper conductors. The coils are made of copper tubing that is formed into the shape of the coil for the induction heating process. Water flows through the coils to keep them cool.
The process of induction heating involves passing a high-frequency alternating current through the induction coil, which creates an electromagnetic field. This field induces electric currents, known as eddy currents, in nearby conductor materials. The eddy currents flow through the resistance of the material and generate heat through Joule heating.
In addition to Joule heating, in ferromagnetic and ferrimagnetic materials like iron, heat is also generated by magnetic hysteresis losses. The frequency of the electric current used for induction heating depends on factors such as the object size, material type, coupling between the work coil and the object, and the penetration depth.
Induction heating can be used to heat and possibly melt various electrically conductive materials, including steel, copper, brass, graphite, gold, silver, aluminum, and carbide. The induction heating process allows for precise control over the temperature and solidification of the melted material.
Induction furnaces, which work on the same principles as transformers, use induction heating for melting metals and making alloys. The primary coils of the induction furnace are made of hollow tubes through which water circulates to keep them cooled. Heat is generated by eddy currents flowing concentrically, producing a high-frequency supply. The heat is transferred to the heated object through electromagnetic induction.
Overall, induction heating is a process that uses electromagnetic induction to heat electrically conductive materials. The coils used in induction heating are water-cooled and do not get hot themselves.
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