Why is the core of transformer made of a material of high permeability and low hysteresis loop?

The core of a transformer is made of a material having norrow hysterisis loop. Why? A core material with narrow hysterisis loop involves much less energy loss (hysterisis loss) due to repeated magnetisation and demagnetisation of the core.

Why is the hysteresis loop narrow?

This heat is known as hysteresis loss, the amount of loss depends on the material’s value of coercive force. By adding additive’s to the iron metal such as silicon, materials with a very small coercive force can be made that have a very narrow hysteresis loop.

What is the role of hysteresis loop in choosing a material for making permanent magnet?

A permanent magnet refers to a material that remains magnetic even once the applied magnetic field is removed. The hysteresis loop tells us information about the magnetic properties of a material, showing the relationship between the induced magnetic flux density (B) and the applied magnetic force (H).

Why do magnetic materials show different loops of hysteresis?

When a ferromagnetic material is magnetized in one direction, it will not relax back to zero magnetization when the imposed magnetizing field is removed. If an alternating magnetic field is applied to the material, its magnetization will trace out a loop called a hysteresis loop.

Why is the core of the transformer made?

The purpose of the iron core is to channel the magnetic flux generated by the current flowing around the primary coil, so that as much of it as possible also links the secondary coil.

Why is the core of a transformer made of a material of high permeability?

The higher the magnetism of the material, the more magnetic field can be “transported” by it. Since, higher permeability translates to more magnetism, so the cores are made with a substance of high permeability. Hence, the core is made of a high permeability material to allow efficient transfer of magnetic field.

What does hysteresis loop indicate?

A hysteresis loop (also known as a hysteresis curve) is a four-quadrant graph that shows the relationship between the induced magnetic flux density B and the magnetizing force H. From hysteresis loops, we can determine a number of magnetic properties about a material.

What is hysteresis loop with its help explain the term retentivity and coercivity?

The magnetic hysteresis, better known as the hysteresis loop, describes the magnetizing force (H) versus the magnetic flux density ( B) of the ferromagnetic material. The tendency of the magnetic material to maintain magnetism, even in the absence of a magnetizing field, is known as retentivity or remanence.

Why is hysteresis loop important?

Hysteresis loop provides the value of retentivity and coercivity of a material. Thus the way to choose perfect material to make permanent magnet, core of machines becomes easier. From B-H graph, residual magnetism can be determined and thus choosing of material for electromagnets is easy.

Why magnetic hysteresis occurs in Ferro and ferrimagnetic materials?

The phenomenon of hysteresis in ferromagnetic materials is the result of two effects: rotation of magnetization and changes in size or number of magnetic domains. In general, the magnetization varies (in direction but not magnitude) across a magnet, but in sufficiently small magnets, it doesn’t.

What is magnetic hysteresis and hysteresis curve explain it?

A magnetic hysteresis, otherwise known as a hysteresis loop, is a representation of the magnetizing force (H) versus the magnetic flux density (B) of a ferromagnetic material. This hysteresis loop therefore summarizes the pathway that a ferromagnetic material takes from the addition and removal of a magnetizing force.

What is hysteresis loss in magnetic materials?

Since a coercive force must be applied to overcome this residual magnetism, work must be done in closing the hysteresis loop with the energy being used being dissipated as heat in the magnetic material. This heat is known as hysteresis loss, the amount of loss depends on the material’s value of coercive force.

What is a hysteresis loop?

If an alternating magnetic field is applied to the material, its magnetization will trace out a loop called a hysteresis loop. The lack of retraceability of the magnetization curve is the property called hysteresis and it is related to the existence of magnetic domainsin the material.

How are soft magnetic materials made from iron?

By adding additive’s to the iron metal such as silicon, materials with a very small coercive force can be made that have a very narrow hysteresis loop. Materials with narrow hysteresis loops are easily magnetised and demagnetised and known as soft magnetic materials.

What is the effect of magnetic hysteresis on flux density?

The effect of magnetic hysteresis shows that the magnetisation process of a ferromagnetic core and therefore the flux density depends on which part of the curve the ferromagnetic core is magnetised on as this depends upon the circuits past history giving the core a form of “memory”.