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The AC power supply used in the induction furnace has three types: power frequency (50 or 60 Hz), intermediate frequency (50 to 10000 Hz) and high frequency (above 10000 Hz).
The main components of the induction furnace are sensors, furnaces, power supplies, capacitors and control systems. Under the action of the alternating electromagnetic field in the induction furnace, eddy currents are generated inside the material to be heated and melted. Under the agitation of the alternating magnetic field, the composition and temperature of the melt in the furnace are relatively uniform, and the melting temperature can reach 1650 °C. In addition to being able to be smelted in the atmosphere, the induction furnace can be smelted in a vacuum and a protective atmosphere such as argon or helium to meet special quality requirements.
Induction furnaces have outstanding advantages in melting soft magnetic alloys, high resistance alloys, platinum group alloys, heat resistant, corrosion resistant, wear resistant alloys and pure metals.
Induction furnaces are generally classified into two types: core induction furnaces and coreless induction furnaces. The core induction furnace has a core passing through the inductor and is powered by a commercial frequency power supply. It is mainly used for the melting and heat preservation of various cast iron, brass, bronze, zinc and other metals. The electrical efficiency is over 90%, and the waste furnace can be utilized. The smelting cost is low, and the maximum furnace capacity is 270 tons. The coreless induction furnace has no iron core passing through the inductor, and is divided into a power frequency induction furnace, a triple frequency induction furnace, a generator set intermediate frequency induction furnace, a thyristor intermediate frequency induction furnace, and a high frequency induction furnace.
Induction furnace principle and its classification
The so-called induction furnace utilizes the inductive electrothermal effect of the material to heat the molten electric furnace.