Coreless Induction Furnace Working Principle

Induction Furnace, Induction Furnaces

Coreless induction furnace is a special induction furnaces. There is no metal core passing through the inductor in the induction furnace. The alternating magnetic field is mainly generated by the induction coil surrounding the crucible.


Classification of Induction Furnaces:

According to the different power supply frequencies, coreless induction furnaces can be divided into: 

  • Industrial frequency induction furnaces
  • Triple frequency induction furnaces
  • Generator set medium frequency induction furnaces
  • Thyristor medium frequency induction furnaces
  • High frequency induction furnaces


Coreless Induction Furnace Working Principle

The coreless induction furnaces working principle is to heat the metal by the alternating magnetic field generated by the heating current in the furnace. The details are as follows:

The metal charge in the IF is placed in a crucible without a ferromagnetic core. When the induction coil is energized, high-frequency alternating current is generated to form a magnetic field. This magnetic field generates eddy currents in the metal, which quickly heats the metal to the required temperature.

1. Magnetic field generation:

When the induction coil close to the crucible is passed with a medium-frequency or high-frequency alternating current, an alternating magnetic field is generated around the crucible. This magnetic field is like an air core transformer. The crucible is equivalent to the "primary winding" of the transformer, and the metal charge in the crucible is equivalent to the "secondary winding".

2. Induction current generation:

Under the action of the alternating magnetic field, a strong induced current will be generated inside the short-circuited metal charge. The magnitude and direction of this induced current will change with the change of the magnetic field.

3. Heat generation:

As the induced current flows, the resistance on the surface of the metal charge will generate heat. This heat will gradually heat and melt the metal charge.

4. Heat transfer:

The heat generated by the induction coil is mainly transferred to the metal charge in the crucible to melt it. At the same time, since the magnetic field only acts on the surface of the heated material, the heating efficiency is high, the heat loss is small, and the heating is uniform.

Application of Induction Melting Furnace:

Coreless induction electric furnace are widely used in the fields of melting, heating and heat preservation of metal materials. The coreless IF and medium frequency induction furnaces provided by Sanrui Electric Furnace are mainly used in the metal smelting industry.

The coreless induction furnace has the advantages of fast heating speed, precise temperature control, energy saving and environmental protection, and environmental friendliness.

If you have any questions or needs about IF, SAF, EAF, LF, LRF, VD, VOD and accessories, please feel free to contact us.


E-mail: alice@srfurnace.com  / Tel: +86 15686041999 (Alice)

E-mail: anna@srfurnace.com  / Whatsapp: +86 159 2955 5868 (Anna)

Website: www.srfurnace.com / www.srmeltingfurnace.com

Xi'an Sanrui Electric Furnace


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