Coreless Furnace & Advantages Of Coreless Furnace

Coreless Induction Furnace Principle

coreless induction furnace
  • The working principle of a coreless furnace is the same as that of a core type furnace.
  • The principle is based on Faraday’s law of electromagnetic induction. The primary winding is connected to the supply and the secondary winding is connected to the load.
  • Here, the load is charged which is to be heated by eddy current loss.
  • The only difference in the coreless furnace is that the core is absent here. The charge of the furnace acts as the secondary winding.
  • The two types of constructions are available in the case of coreless furnaces i.e. conducting bottom and non-conducting bottom.
  • If the container is made up of conducting bottom then a charge may be conducting or non-conducting. Since bottom acts as the secondary.
  • But if the container is made up of some insulating medium then the charge must be conducting one to form the secondary.
  • Conducting container and charge can have cither conducting or non-conducting properties,
  • In Fig. coreless furnace is shown as having a non-conducting container and the charge must necessarily have to conduct properties.
  • Due to primary winding, coils get heated up therefore, the cooling arrangement is done by making hollow copper tubing in which cooling water is circulated.
  • These furnaces require 500 to 1000 Hz frequency supply.
  • The power factor of the coreless furnace is very low i.e. 0.1 lag. Therefore, to improve the same, a bank of capacitors is used in parallel with a heating coil.

Advantages Of Coreless Furnace

  1. Less melting time.
  2. Absence of dirt, smoke, noise, etc.
  3. Automatic stirring action produced by eddy currents.
  4. Simple charging and pouring.
  5. Precise control of power.
  6. The operating of the furnace is intermittent, as no
  7. time is lost in warming up.
  8. Low operating cost.
  9. NO contamination of charge and very accurate control of composition. So it is most suitable for production of high grade alloy steels.

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