Re: TC Inductance Formulas...
Subject: Re: TC Inductance Formulas...
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Date: Thu, 8 Feb 1996 15:21:32 +1200
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On this from Tim Chandler....
> I was going through some old TC notes and discovered I had atleast 4
> different formulas to calculate the inductance of a coil (air-core). The
> problem is all these formulas give different answers (some +/- 5 mH). My
> question is, which one is right(if any)? Rather than post all the formulas
> I thought I would ask if any knew of a formula for inductance that is
> EXTREMELY close to the true measured inductance of the coil?
> Any help appreciated...
I've been using Wheeler's with a slight modification for helical
coils. Instead of a bottom line = 9r + 10h, I've been using a
bottom line = 10(r + h). It seems slightly better for typical
Tesla secondaries. In any case, Wheeler seems to come within about
5% worst case and often better in my experience.