The object heated by magnetic induction must be an electrical conductor

The object heated by magnetic induction must be an electrical conductor

The thermoelectric effect generated by the induced electromotive force (vortex) of an electric conductor in an alternating magnetic field causes the conductor to heat itself. According to different heating process regulations, the frequency of AC used for magnetic induction heating includes direct current (50-60 Hz), high frequency (60-10000 Hz), and high frequency (over 10000 Hz). DC switch mode power supply is the AC power discharged in general industrial production, and the vast majority of DC in China is 50 Hz worldwide. The working voltage of the DC switch power supply used for magnetic induction heating applied to the magnetic induction equipment must be adjustable. According to the output power size of the heating machine equipment and the volume size of the power supply network, a DC high-voltage power supply (6-10KV) can be used to supply power to the transformer system; The heating machine equipment can also be immediately connected to a 380V bottom voltage power grid.

The medium frequency induction furnace used high-frequency diesel generators for a long time. It consists of a high-frequency generator set and an asynchronous motor driver. The power of this type of generator set is generally within the range of 50-1000KW. With the technological development trend of power electronics technology, bidirectional thyristor soft starter medium frequency induction furnace has been applied. This type of intermediate frequency induction furnace uses bidirectional thyristors to first convert DC AC current into DC power, and then convert DC power into AC current of the desired frequency. Due to their small size, light weight, no noise, and reliable operation, these types of DC frequency conversion machines have gradually replaced high-frequency diesel generators.

High voltage power supplies usually first use a transformer to increase the working voltage of three-phase 380 volts to a high voltage of about 20000 volts. Then, use thyristors or high-voltage silicon rectifier components to rectifier the DC AC current into a DC power supply, and then use electronic devices to oscillate the DC power supply into high-frequency and high-voltage AC current. The power of high-voltage power supply machines and equipment ranges from tens of kilowatts to hundreds of kilowatts.

The object heated by magnetic induction must be an electrical conductor. When high-frequency AC circuits rely on electrical conductors, they cause skin effect, meaning that the surface current intensity of the electrical conductor is high, while the current intensity of the electrical conductor management center is low.

Magnetic induction heating can perform overall uniform heating and surface heating on objects; Metal materials that can be smelted; In the high-frequency range, changing the appearance of the heating electromagnetic coil (also known as the sensor) allows for arbitrary partial heating.

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