Transformer Flux and Exciting Current

• Jin0505
In summary, transformer flux is the measure of the magnetic field created by the flow of electric current through the primary winding of a transformer. It is calculated by multiplying the number of turns in the primary winding by the current flowing through it, and then dividing by the area of the core. The amount of current and number of turns in the winding, as well as the core material, frequency, and design, all affect transformer flux. Exciting current is the necessary current that flows through the primary winding to create the magnetic field, and increasing transformer flux will also increase the amount of exciting current. However, excessive flux can lead to overheating and damage to the transformer, so it is important to design transformers with the appropriate amount of flux for their intended
Jin0505
Can anyone explain in a transformer, how could a non-sinusoidal wave of exciting current produces a sinusoidal wave of flux?

Jin0505 said:
how could a non-sinusoidal wave of exciting current produces a sinusoidal wave of flux?
Say you have a triangular exciting current. If you Fourier transform this current, it will have a dominant first harmonic ( sine wave ).

It will also have a lot of higher harmonics, that are dampened due to self induction and iron losses in the transformer. Hence you will see a flux wave that is similar to a sine wave, but is not a perfect sine wave.

1. What is transformer flux?

Transformer flux is the measure of the magnetic field created by the flow of electric current through the primary winding of a transformer. It is responsible for inducing an electromotive force (EMF) in the secondary winding, which allows for voltage transformation.

2. How is transformer flux calculated?

Transformer flux is calculated by multiplying the number of turns in the primary winding by the current flowing through it, and then dividing by the area of the core. This is known as the flux density, and is measured in teslas (T).

3. What factors affect transformer flux?

The amount of current flowing through the primary winding and the number of turns in the winding are the main factors that affect transformer flux. Other factors include the type and quality of the core material, the frequency of the input power, and the design of the transformer.

4. What is exciting current in a transformer?

Exciting current, also known as magnetizing current, is the current that flows through the primary winding of a transformer when an alternating voltage is applied to it. This current is necessary to create the magnetic field that induces voltage in the secondary winding.

5. How does increasing transformer flux affect exciting current?

Increasing transformer flux will also increase the amount of exciting current flowing through the primary winding. This is because a stronger magnetic field is required to induce a higher voltage in the secondary winding. However, excessive flux can lead to overheating and damage to the transformer, so it is important to design transformers with the appropriate amount of flux for their intended use.

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