Why transformer core is laminated?

Answer 1

The reason we laminate the iron cores in Transformers is because we want to limit what are called eddy currents. Transformers are basically two coils of wire wrapped around a core of iron. They work by induction. Induction occurs when current flows in one conductor (or one set of windings in the transformer) and the magnetic field that forms around that conductor (that set of windings) sweeps the other conductor (the other set of windings) and induces a voltage. In order to increase the effectiveness of the transformer, we need to improve the way the magnetic fields are coupled from one set of windings to the other set. Iron conducts magnetic lines of force well, so we use that to help conduct the magnetic lines of force from coil A to coil B. Problem is, iron is also a conductor, and it's being swept by the magnetic field as well. If we didn't use laminations, the iron core would provide a place for the magnetic lines to produce (induce) current, and that current flowing in the core would heat the core up really fast and waste energy. By laminating the cores, we break up the current paths within that core and limit eddy currents.

Answer 2

The lamination core is used in a transformer is mainly to reduce the eddy current loss. By doing so we literally increasing the effective resistance for eddy current.thus there is reduction in eddy current.

Answer 3

Lamination is used for the core of transformers because you want good ferromagnetic coupling, but you do not want electrical continuity.

If you look very closely, you will notice that the laminations are E's, stacked in alternating, opposite directions, and that they are insulated from each other. If they were allowed to touch each other, they would complete a circuit and constitute a one-turn short circuit which would drastically reduce the Q of the transformer.

Answer 4

The reason we laminate the iron cores in transformers is because we want to limit what are called eddy currents.