Why you use ferromagnetic core in transformer?

Answer 1

Many wonder what is the function of iron core transformer. The iron core in a transformer facilitates max flow of magnetic flux between primary and secondary windings. It result in inducement of the same voltage in both windings is possible.

Answer 2

You use an iron core in a transformer because you want to maximize the efficiency of the transformer. Transformers work on the principle of magnetic coupling between two or more alternating current carrying windings. You need a ferrous material to focus the magnetic lines of force, and iron is particularly good as a ferrous material.

Another Answer

Iron is a 'soft' magnetic material, which means that it can be magnetised and demagnetised very easily. When we pass an alternating current through the primary winding of a transformer, an alternating magnetic field is set up within the core. Iron allows this magnetic field to increase, decrease, and reverse, as the current varies, very easily and without any significant loss of energy. Steel, on the other hand, is a 'hard' magnetic material, which means that it is difficult to magnetise and demagnetise, and requires a great deal of energy, making it unsuitable for a transformer core.

Incidentally, transformer cores are often described as being manufactured from 'silicon steel' or 'transformer steel'. These are misnomers, because they are actually manufactured from silicon iron.

Answer 3

To 'contain' the magnetic flux produced by the primary winding, to ensure that it links with the secondary winding with the minimum 'leakage'. The core is a magnetic circuit manufactured from laminations of silicon steel, to maximise the flux density and to minimise eddy-current and hysteresis losses.

Answer 4

hysteresis loop has minimum loop area...so core loss willl be minimum....