Topic on Induction Heating History on the View of Hitfar
The induction heating technology was originally derived from the electromagnetic induction phenomenon discovered by Faraday, that is, the alternating current generates an induced current in the conductor, and the current continuously moves inward and outward to form an eddy, which leads to the eddy current range of the conductor. Autonomous autologous fever. In 1890, Swedish technicians invented the first induction melting furnace, the slotted cored induction heating furnace. In 1916, the Americans invented the closed-cell cored induction heating furnace, and the induction heating technology gradually entered the practical stage. Bringing energy-saving and energy-saving heating methods to various industries.
At the beginning of the 20th century, the period of rapid development of power electronic devices and technologies greatly promoted the new development of induction heating technology. In 1957, the United States developed a thyristor (SCR) as a milestone in power electronics, marking the beginning of the application of modern power electronics technology in the field of induction heating, and also triggered a revolution in induction heating technology. In 1966, Switzerland and West Germany first used thyristors to develop induction heating devices, and the induction heating technology began to develop rapidly.
After the 1980s, power electronic devices developed rapidly again, and devices such as GTO, MOSFET, IGBT, M CT, and SIT appeared one after another. Inductive heating devices have also gradually abandoned thyristors and are beginning to adopt these new devices. Nowadays, IGBTs and MOSFETs are commonly used. IGBTs are used in larger power applications, while MOSFETs are used in higher frequency and lower power applications. According to reports, foreign countries can use IGBT to achieve induction power of more than 1000kW, the frequency exceeds 50kHz. MOSFETs are more suitable for high-frequency applications, usually used in small and medium power applications of several kilowatts, the frequency can reach more than 500kHz, even a few megahertz. However, there are also high-power induction heating devices using MOSFETs in foreign countries, such as the 2000kW/400kHz device developed in the United States.
The real application of induction heat treatment technology in China began in 1956 and was introduced from the former Soviet Union, mainly in the automotive industry. With the manufacture of induction heating power supplies in the 20th century, induction hardening heat treatment process equipment was also followed by development. At present, the domestic induction hardening heat treatment process equipment manufacturing industry is also expanding, and there are many varieties of products. The equipment that originally needed to be imported is gradually replaced by national products. While saving foreign exchange for the country, it has developed domestic related enterprises. At present, the service targets of induction heating manufacturing are mainly automobile manufacturing, electronics industry and foundry industry. In the future, modern metallurgical industry will have greater demand for induction heating.