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Induction heating uses electromagnetism to heat objects that conduct electricity. It is most effective on ferrous metals and can be precisely controlled. It has many industrial and home applications, including cooking, and uses a working coil to generate heat through electrical currents and friction.
Induction heating relies on electromagnetism to generate heat in a target object. This process is most effective when used to heat ferrous metals, but can be used to heat any material that conducts electricity. A very high frequency alternating current is used to create a magnetic field, which in turn generates both electric eddy currents and microscopic level frictional heating in the object being heated. Induction heating has a variety of uses ranging from home cooking to specialized industrial applications.
The heart of any induction heating system is a working coil, which carries alternating current and acts as an electromagnet. An object to be heated by induction, sometimes referred to as a work piece, is then placed in or near the coil. Induction generates changing electrical currents in the workpiece, and these currents generate heat when they overcome the inherent resistance in the conductor.
A second process speeds up the heating of ferrous metals. Electric currents arise when a ferrous metal such as iron is heated by induction. Magnetic forces also act on the metallic crystals that make up these materials. The rapidly changing magnetic fields create a vibration in ferrous metals and this produces additional heat through friction.
Inductive heating is used in many industrial applications because it can be controlled quite precisely and because no heat transfer or open flames are required. Small amounts of induction are sufficient to melt and melt plastic, and an induction heating machine is often used for this purpose. Heating of these substances can be accurately controlled by adding only small amounts of conductive materials to the specific areas that require heating.
Metals can be heated quickly and accurately via induction. This is particularly useful when relatively small amounts of metal need to be heated, since inductive heating requires only a modest amount of physical equipment. The rate at which metals are heated can also be controlled with great precision by changing the configuration of the circuitry associated with the work coil.
An especially common application of induction heating is in cooking appliances. Hobs that rely on induction are generally designed to work with ferrous metal cookware only. Induction heating is very useful in kitchen applications because the actual cooking surface is not heated directly, which improves cooking safety. The heat generated by induction is also available almost instantly, as opposed to the heat produced by cooking elements which generate heat by resistance and then transfer that heat to the cooking vessels.
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