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Community > Groups > Component Learning > Inductor coil parasitic capacitance, using the cosh function
Inductor coil parasitic capacitance, using the cosh function
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OSCAR GOMEZ

I have a formula for predicting the capacitance of an air core inductor.
Cparallel (pF per turn) = B * Er / {11.45*cosh^-1(S/D)}
where B = coil diameter mm
Er = dielectric constant (of air) = 1
S = gap between the coil turns mm
D wire diameter mm
I think cosh^-1 is the inverse cosh function.
Can I get a scientific calculator to give that answer, when S/D = 1?
If I press
2ndF, then hyp, then cos (1), I get 0
or
hyp, then 2dF then cos (1), I get 0
or
hyp, then cos (1), I get 1.54
Any idea if any of these answers could be correct?
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Antonio Rubio Llorca

Thanks for marvelous posting.

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