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Re: [TCML] inductance Vs diameter Vs height
Guys, I have a little spreadsheet for that graph I showed. It was based
on h/d and Fr. My thoughts at the time is that this maxL was always
based on a low frequency condition. Thus, I thought, what about when the
coil is operating at Fr? Does that max inductance ratio still apply? The
answer is NO. Of course not. Les is the effective series inductance at
the resonant frequency of the coil. And of course,, depending on Les for
your specific coil, the maximum inductance attainable is different than
the standard ratio so often referred to.
So often, coilers forget that our coils have an operating frequency and
the inductance at that AC is not 50 or 60 Hz. Inductances does change
with frequency and thus, so does maximum inductance for a geometry.
My point here is that when contemplating a maximum inductance, use the
inductance at which the coil will see, not some low frequency value that
is unreal. Here's that spreasheet:
Phil Tuck wrote:
I came across this post the other day while looking for something related: http://www.pupman.com/listarchives/2009/Mar/msg00178.html
I do not know if it is correct though !!
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