Transformer Flux and Exciting Current

AI Thread Summary
A non-sinusoidal exciting current, such as a triangular wave, can produce a sinusoidal wave of flux in a transformer due to its Fourier transform, which reveals a dominant first harmonic (sine wave) along with higher harmonics. These higher harmonics are dampened by self-induction and iron losses within the transformer. As a result, the flux wave generated resembles a sine wave but is not perfectly sinusoidal. This phenomenon highlights the relationship between the shape of the exciting current and the resulting magnetic flux. Understanding this interaction is crucial for transformer design and efficiency.
Jin0505
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Can anyone explain in a transformer, how could a non-sinusoidal wave of exciting current produces a sinusoidal wave of flux?
 
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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.
 
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