Re: Recycled: Measuring Coupling Coefficients

From: 	Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: 	Saturday, December 06, 1997 7:20 AM
To: 	Tesla List
Subject: 	Re: Recycled: Measuring Coupling Coefficients

Mark S. Rzeszotarski wrote:

> 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
amazingly close to the values that I have actually measured, at a number
pri-sec relative positions.  Quite impressive for a program that works
first principles, rather than from empirical approximations.