Re: Inductance of a conical coil

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Godfrey Loudner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <ggreen-at-gwtc-dot-net>

Hello Antonio

Using numbers from Bart's old 12.75" coil, I have a comparison chart for k
below. I used the acmi numbers for Lp and Ls. Nice engine you have!

height  measured   acmi      Godfrey   Antonio
    3"      0.1255     0.1238   0.1263    0.1262
    2"      0.1395     0.1384   0.1408    0.1408
    1"      0.1567     0.1542   0.1565    0.1565
    0"      0.1730     0.1708   0.1728    0.1730
  -1"      0.1878     0.1874   0.1891    0.1894
  -2"      0.2031     0.2032   0.2047    0.2051
  -3"      0.2174     0.2177   0.2191    0.2196

Not a bad beginning for both of us. No matter how accurately M is
computed, there is still the problem of Lp. It will be interesting if you
can effect a numerical integration scheme for Lp. As for myself, I'm
going after an approximation formula for Lp. But first I must feel that
I have control over M. I feel that, whatever ideas give me control
over M, will also give me control over Lp.

Godfrey Loudner





 > By the way, I have added mutual inductance calculation to my
 > Teslasim design/simulation program.
 > http://www.coe.ufrj.br/~acmq/programs
 >
 > Antonio Carlos M. de Queiroz