Medium frequency induction furnaces are specialized equipment used for melting metals through the process of electromagnetic induction. These furnaces operate by converting three-phase alternating current (AC) into direct current (DC), then back into an adjustable medium frequency AC. This AC is supplied to a capacitor and an induction coil, generating a high-density magnetic field. When this field cuts through metal material within the coil, it induces a large eddy current in the metal, heating it due to the metal's inherent resistance.
The working frequency of medium frequency induction furnaces typically ranges from 50 to 10,000 Hz, making them suitable for smelting both ferrous and non-ferrous metals. These furnaces offer several advantages over other types of melting equipment, including higher thermal efficiency, shorter melting times, reduced burning of alloy elements, a wide range of melting materials, minimal environmental pollution, and precise control over the temperature and composition of the molten metal.
The principle of operation is based on electromagnetic induction, where electric energy is transferred to the metal via induction coils, converting the energy into heat to melt the metal. The coils do not directly contact the metal; instead, energy is transferred through electromagnetic induction. This method allows for efficient heating and melting, with the added benefit of easy temperature control and high production efficiency.
Medium frequency induction furnaces are versatile and find applications in various industries, including heating forging of standard parts, melting of various metal materials, and heating of motor rotors for matching. They are also known as medium frequency electric furnaces due to their heating frequency range, which is typically between 150 and 8000 Hz. These furnaces are integral in processes that require precise heating and melting of metals, contributing to their widespread use in industrial settings.
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