Re: [TCML] inductance Vs diameter Vs height

[bartb <bartb@xxxxxxxxxxxxxxxx>]

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:  
http://www.classictesla.com/temp/max_inductance_csv.xls

Take care,
Bart

Phil Tuck wrote:
> Scott:
>
> 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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