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5. What is Magnetization or Saturation Curve? (What is Magnetization or Saturation Curve)

# What is Magnetization or Saturation Curve? (What is Magnetization or Saturation Curve)

Hello friends, in this article we will know that what is called Magnetization or Saturation Curve, what is it and will learn about many facts related to this curve.

## Magnetization or Saturation Curve

Magnetic properties of iron, steel and their allied metals are generally represented by magnetization curves. The magnetization curve shows the relationship between the flux density B and the field strength H.

A magnetic curve for cast steel is shown in the figure. Concave slightly upwards from O to A. The curve from A to B is almost a straight line. After point B, for the increase in H flux The increase in density occurs very slowly and eventually the iron becomes saturated.

electromotive force generated in the generator,

E = (ΦZN/60).P/A volt
= (ZP/60) N volt

ZP/60 is a constant quantity for each machine. On representing it by K,

E = KΦN

It is clear from the above equation that the electro-carrying force E produced is directly proportional to the flux per pole and the speed N. If the speed of the generator is kept constant, the electromotive force produced is directly proportional to the flux per pole. The flux is generated by the field ampere-turn and because the field currents are constant, the flux depends on the field current. Due to the variable magnetization of a magnetic circuit, the flux is proportional to the field current.

The relationship between field ampere current (NI) and flux per pole, i.e., the saturation curve, is shown in the figure. The flux does not start from zero, but due to residual magnetism in the magnetic circuit, some flux also occurs initially. The saturation curve for low values ​​in the field ampere circuit is, in fact, a straight line because most of the reluctant in the magnetic circuit is due to the air gap. At point q the iron starts to get saturated and the curve becomes flat.

This curve is called magnetization or saturation curve at no load. It is also called open circuit characteristics.