Question

why soft iron is preferred for making the core of transformer?✌️

give full explanation

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Answer 1

Explanation:

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The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magnetism as soon as the current stops flowing. Soft iron is said to form a temporary magnet.

Soft iron is used in magnetic assemblies, electromagnets and in some electric motors; and it can create a concentrated field that has more intense than an air core. Soft iron that has a low carbon content and is easily magnetized and demagnetized, used to make the cores and other electrical equipment

and also

The magnetic field is often created by a current-carrying coil of wire around thecore. The core of the transformer is made up of soft iron to increase the magnetic field and this helps in saving of energy . Explanation : When the core is filled with soft iron , the magnetic field becomes very strong.

hence soft iron is preferred for making the core of transformer

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Answer 2

Answer:

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Explanation:

The core of the transformer is made up of soft iron to increase the magnetic field and this helps in saving of energy . Explanation : When the core is filled with soft iron , the magnetic field becomes very strong. ... This ensures perfect conversion of energy and hence the core is made of soft iron.

The core of the transformer is made up of soft iron to increase the magnetic field and this helps in saving of energy . Explanation : When the core is filled with soft iron , the magnetic field becomes very strong. ... This ensures perfect conversion of energy and hence the core is made of soft iron.The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magnetism as soon as the current stops flowing. Soft iron is said to form a temporary magnet.

Soft Iron core is used in a transformer to facalitate low reluctance path for the flux linkage between primary & secondary windings. Reluctance in magnetic circuit is analogous to resistance in electric circuit which resists the generation of flux in the windings. Without the soft iron core or with air as a core, the flux linkage will be poor & hence the output of the transformer will be reduced. Soft Iron core also posseses low retentivity & coercivty thereby reducing the hysteresis losses.To reduce losses compared to air core.

In theory if there are 20 turn on one side of transformer and 2 turns on other side then it should convert 400 V to 40V.

But that is also true for 20000 turn on one side and 2000 turns on other side.

However, when I was an undergraduate student I got a transformer custom designed with 1 turn on one side and 10 turns on other side, to act as CT for measurement. And I realised that it didn't work. There was nothing at the 10 turn output side, even at rated current on input side, because there wasn't strong enough flux to link field variation in primary coil to variations in secondary coil.

Then I got another one with 10 turn on primary side and 100 turns on secondary side and it worked because there was now enough mutual induction.

What I was doing was just to sense the signal with enough strength to measure it so %age losses were not so important.

But if purpose is to step up or step down voltage while supplying power then efficiency is very important and all power in primary should link to secondary coil(s). Practically this efficiency should be 90+ to make existing systems affordable.

But we can't add too many turns because there is only limited surface area and volume in close proximity among coils. Just like you can't ask 100 people to lift a car with bare hands, although it will only be few kilos per person but they can't even reach the car so they can't lift it. So number of turns is limited by physical size then what should be done to improve flux linkage?

So one way is to change the medium from air to a ferromagnetic material such that magnetic field is enhanced and strong flux linkage is formed between coils of transformer, with minimum possible turns and with safe distance between coils to prevent voltage differences from causing insulation failures. Therefore we use iron core in transformer.

There are other details as to what flux linkage exactly means, why iron or any other material and how does signal frequency affect choice of transformer core material. But here I have tried to involve minimum concepts.The soft iron inside the coil makes the magnetic field stronger because it becomes a magnet itself when the current is flowing. Soft iron is used because it loses its magnetism as soon as the current stops flowing. Soft iron is said to form a temporary magnet.

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