What is magnetization curve of transformer?

The magnetization curve of the current transformer shows the relationship between the secondary excitation current and secondary excitation voltage. The equivalent circuit diagram of the current transformer is as given below. Schematic diagram of CT. I1: primary current. I2 = Kn I1: secondary current for a perfect CT.

What is magnetization curve and air gap?

The extension of the linear portion of the magnetization curve, shown dotted in Fig. 7.20, is known as the air-gap line as it represents mainly the magnetic behaviour of the machine’s air-gap, the iron being unsaturated in this region consumes negligible ampere-turns; in any case the effect of iron is also linear here.

What is no load magnetization curve?

The magnetization curve of a generator shows the relationship, at constant speed between the no-load terminal voltage and the exciting current. This curve is often called an open- circuit characteristics curve or no-load curve. The total induced EMF of the armature: Z = total number of conductors in the armature.

What is magnetizing inductance in induction motor?

2. Vector diagram of induction motors. The magnetizing inductance is calculated from the magnetic energy and the magnetic co-energy of a motor supplied by the magnetizing current since the stator and the rotor core are made of nonlinear material, although rotor bars and end-rings are linear materials.

What is the importance of magnetization curve?

Magnetization curve of a DC generator has great importance because it represents the saturation of the magnetic circuit. For this reason, this curve is also called saturation curve.

What is back EMF in motor?

When the armature of the DC motor rotates under the influence of driving torque, the armature of the conductors moves through a magnetic field inducing an emf in them. The induced emf is in the opposite direction to the applied voltage and is known as the back emf.

How do you calculate stator inductance?

You can calculate Stator Induction by Stator Current measurment in Free Run mode: X=U/I; Ls=X/(2*Pi*f) .

Why the magnetization curve is a non linear curve?

It indicates that absolute permeability of a material is not constant but it varies. It indicates that relative permeability of a material is not constant but it varies. It indicates that relative density of a material is not constant.

What is the difference between emf and back EMF?

EMF (or Electro Motive Force) is the voltage applied to the motor from an external power supply. Back EMF is the voltage produced within the motor windings which is opposite polarity but smaller than the applied voltage.

Why is it called back EMF?

The induced emf is sometimes called back emf because it opposes the change in current , due to the source of the emf.