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I have simulated an electrical machine in mathematica in discrete calculus. One of the results is three phase currents. My plotted answer is like below: enter image description here

Now I'm looking for harmonic amplitude spectrum of the current of any of phases, for instance phase A like following figure: enter image description here

I should mention that as all my simulations are in discrete calculus the phase current answer is a vector like:

ia={0, 0., -0.548775, <<14995>>, 11.4906, 10.9900, 11.1094}

Thanks in advance

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  • $\begingroup$ Choose a period where the phase currents will not have transient changes, apply a windowing function to the data and then do a fourier transform to get your frequency spectrum? $\endgroup$ – Bill Apr 28 at 16:47

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