Principle of Work of Induction Heating Systems

One of the modern heating types is the induction heating that is characterized as a non-contact process. The induction heating systems work with the usage of electricity with high frequency the purpose of which is to electrically heat conductive materials. Such a non-contact principle of work guarantees that the material that is heated doesn't change its physical and chemical characteristics with the growth of its temperature. This effective process allows the system and, consequently, the room to be heated from the inside. The heat method has got the name of a heat treat one and proves to be quite efficient and can be applied in the most unexpected and unique ways. These heating systems have an electromagnet that gives an opportunity to the high frequency changing current to be easily passed through. It has to be mentioned that the frequency of the used power greatly depends on the following factors: the object's size, the penetration depth, the type of material, and the coupling between the work coil and the object.

The electricity with high frequency is required to direct the great changing current into the induction heating coil. This coil is considered to be the work coil. In the process of the current passing through the induction coil, a strong quickly alternating magnetic field is formed in this coil. The heated workpiece is located inside the alternating field. And depending on the character the workpiece as well as the type of material different results may happen. With the usage of some materials a current flow is produced by the alternating magnetic field in the conductive workpiece.

The work coil functions near the workpiece as the electrical transformer. In fact, it's a main source of electrical energy. At the same time, the workpiece functions as the single turn short-circuited secondary. As a result of this process enormous currents are created. They are called eddy currents and are passed through the workpiece. The induction heating machines work due to the high frequency that is formed in them. They cause a phenomenon known as the skin effect. This effect makes the current formed in a thin layer flow to the surface of the workpiece.

During the process of the induction heat treat, the phenomenon of skin effect leads to the growth of metal resistance for huge currents to flow. As a result, the induction heating effect is strengthened (mainly, due to the current production in the workpiece).

Induction heating systems are nowadays used in numerous applications where a conductive material needs to be heated in a clean, efficient, and controlled. The most common applications of the higher described process presuppose sealing of the bottle tops used for medicine and drinks. Thus, for instance, the anti-tamper seal is placed on the bottle top with the help of the induction heat machines. It's completed in the manufacturing process during coating of a foil seal with the hot glue that is inserted into the bottle cap before screwing the top on the bottle. After that the bottle is subjected to handling of the heating equipment under the influence of which the glue is melted and the foil is sealed on the bottle top.

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