Hello friends, today I am going to tell you Principle Of CoreLess Induction Furnace, Principle CoreLess or High-Frequency Induction Furnace, Advantages of Coreless Induction Furnace: If you also want to know, then keep reading this article completely.
Principle CoreLess or High-Frequency Induction Furnace
As the name suggests, the coreless induction furnace does not have a magnetic core to couple the primary coil with the charge. It has three main parts.
(i) Primary coil (ii) Refractory receptacle (ii) Frame (for supporting)
The special feature of this furnace is that it does not have a constant iron coil for magnetic flux and less refractory material is used in it as compared to other types of furnaces. Standard crucibles are used for small furnaces. The charge is placed in the crucible and the primary winding coil is connected to the high-frequency AC supply.
The flux generated by the primary winding generates vortex currents in the charge which try to flow through the concentric inductor. These vortex currents heat the charge to its melting point and generate electromagnetic forces that make the charge spin rapidly. This gives a similar quality to the metal.
- Read more:- What is Protective Relay?
Due to high frequency, necessary voltage is generated in the secondary and due to skin effect heat is generated in the primary coil. Therefore, in the primary winding, the coils are made of hollow tubes, and water is passed through them to cool them.
Insulated supports are required for these furnaces, otherwise, the strip magnetic field outside the primary coil generates an electromotive force, causing vortex currents to flow in it and reducing its efficiency.
Advantages of Coreless Induction Furnace
Coreless furnaces have the following advantages:
(i) Its operating cost is less.
(ii) It costs less to install.
(iii) Automatic stirring action is produced due to vortex currents.
(iv) Dust, soil, noise, etc. are not present in it.
(v) It does not take time to heat up. In this way, it can be used intermittently also.
(vi) Correct control of power is possible in this.
(vii) It has a short melting time, does not lose charge. Therefore, it is most suitable for the production of high-grade steel alloys.
- Read more:- Energy and Environmental Problems
- Read more:- What is Protective Relay?
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