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Re: Recycled: Measuring Coupling Coefficients
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To: "'Tesla List'" <tesla@poodle.pupman.com>
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Subject: Re: Recycled: Measuring Coupling Coefficients
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From: Tesla List <tesla@stic.net>
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Date: Sat, 6 Dec 1997 23:46:14 -0600
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Approved: tesla@stic.net
From: Greg Leyh[SMTP:lod@pacbell.net]
Sent: Saturday, December 06, 1997 7:20 AM
To: Tesla List
Subject: Re: Recycled: Measuring Coupling Coefficients
Mark S. Rzeszotarski wrote:
[snip]
> You can precalculate M and K quite easily using Neumann's formula.
> It is a slow numerical integration, but yields accurate results. The power
> series approximation described in Grover's Inductance text is inaccurate for
> typical tesla coil geometries. I have written the numerical integration
> code, and it is fairly straightforward. It has worked well for me for
> solenoidal and flat spiral primaries, and gives an approximate solution for
> inverted cones. (M is accurate, but Lp is approximated.) I plan to post
> the program to the net after some more fine tuning. It is in beta testing now.
As an aside, Mark's program came up with k values for my new coil that
were
amazingly close to the values that I have actually measured, at a number
of
pri-sec relative positions. Quite impressive for a program that works
from
first principles, rather than from empirical approximations.
-GL