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My resonant frequency in simulation is different like resonant frequency calculated by Thompson formula, what is wrong?

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Tomas Schnierer
Tomas Schnierer 2018-3-10
评论： David Goodmanson 2018-3-10
Hello, I have a question, about paralell resonant circuit, I have to compare impedance characteristics of this circuit:
</matlabcentral/answers/uploaded_files/107966/chko%20paralelna.png> I calculated frequency characteristics by this equation in P1: fr=1/2*pi*sqrt((Lt+Lf)*Cf) I have parallel resonant on frequency 187 Hz (187/50=3,742), impedance on this frequency is 41,3 ohm, like we see in tab, but in simulation in simulink I have only 0,12 ohm, I dont know what is wrong
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David Goodmanson
David Goodmanson 2018-3-10
Hi Tomas,
I of course don't know if that line is copied verbatim from your code, but if it is, it certainly isn't helping things that you have
fr=1/2*pi*sqrt((Lt+Lf)*Cf)
instead of
fr=1/(2*pi*sqrt((Lt+Lf)*Cf))

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