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Heating process of intermediate frequency induction furnace

Author : Hongteng Time: 2022-07-29

After reading our previous articles, I believe that everyone has a basic understanding of induction furnaces.

Induction furnace is an induction heating equipment used to heat metal, because it uses a power supply device that converts power frequency 50HZ alternating current into intermediate frequency (300HZ or more to 10000 HZ), so it is also called intermediate frequency furnace.

So, how does the intermediate frequency induction furnace convert electrical energy into heat energy to heat the metal during the heating process? In theory, the intermediate frequency induction furnace heating process includes three stages.

The first stage: the alternating current of the intermediate frequency induction furnace frequency conversion device generates an alternating magnetic field

When the alternating frequency current of the intermediate frequency induction furnace passes through the spiral induction coil, a magnetic field is generated in and around the space surrounded by the coil.

The polarity and strength of the magnetic field varies with the frequency of the alternating current. Part of the magnetic line penetrates the metal charge, and part of it penetrates the lining material.

The polarity, strength, and rate of change of magnetic flux, that is, the direction of the magnetic field and the number and density of magnetic lines of force, are determined by the current intensity, frequency, and the number of turns and geometric dimensions of the coil passing through the induction coil.

The second stage: the alternating magnetic field of the intermediate frequency induction furnace frequency conversion device generates an induced current

Part of the magnetic field line of the magnetic field penetrates the metal charge, which is equivalent to the movement of the conductor to cut the magnetic line of force, thereby generating an induced electromotive force E in the closed loop formed between the metal charge.

E=4.44fφ(V)

φ——The magnetic flux of the alternating magnetic field, Wb

f——frequency of alternating current, Hz

Under the action of the induced electromotive force E of the intermediate frequency induction furnace, an induced current is generated in the metal charge. The magnitude of the induced current I obeys Ohm’s law, and its magnitude is expressed by the following formula:

Induced current I=U/R

R——The effective resistance of the metal charge, Ω.

The third stage: the induction current of the intermediate frequency induction furnace is converted into heat energy

The induced current generated in the metal charge has to overcome a certain resistance during the flow process, thereby converting electrical energy into heat energy. Using this thermal energy, the metal charge is heated and melted.

Therefore, the energy conversion of the whole intermediate frequency induction furnace heating process.

First, the electrical energy is converted into magnetic field energy, and then the magnetic field energy is converted into electrical energy, and most of all, the electrical energy is converted into thermal energy for metal heating.

Luoyang Hongteng is a professional manufacturer of induction furnaces. Welcome to follow us. You can learn more about induction furnaces.

Video of the use process of the furnace

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