Re: Mutual Inductance & K Factor

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

Original poster: "Kurt Schraner by way of Terry Fritz <twftesla-at-qwest-dot-net>" <k.schraner-at-datacomm.ch>

Hi John,

extensive K factor tests and comparison to Mark's M&K program were
perfomed in autumn 2000. The simple mutual inductance method (-at- 50Hz
AC line f) was used for the tests. Some results-graphs can be viewed
on my website:

http://home.datacomm.ch/k.schraner/bw_mk2.gif
http://home.datacomm.ch/k.schraner/bw_mk3.gif

If they were not deleted, you might find the Excel files, which I have
sent you, for the full data:

Tue, 21 Nov 2000 05:13:43 File: bw_mk.zip     <-- Excel: M&K data
Thu, 23 Nov 2000 10:11:08 File: BW_design.zip <-- Excel: coil data

The bw_mk.zip file can also be downloaded:
http://home.datacomm.ch/k.schraner/bw_mk.zip

The comparison of my- and many others's results with acmi can be had
on Bart's website:
http://www.classictesla-dot-com/sim/k.html

The comparisons are giving a lot of trust in the 2 programs (MandK and
acmi), and if good precision conditions for the experiment are not
guaranteed, I would trust more to those calculations, which are based
on sound physical principles, than to an average-quality experimental
value. It seems to me, those programs need well to be distinguished,
from empirical function-fitting formulae (to a limited range of
experimental data), as a means of prediction: the former beeing
intrinsically more reliable. They may serve, delivering a set of
pseudo-experimental data for the fit of an empirical function, the
way, Bart has provided in his great Java TC calculator.

Cheers,
         Kurt Schraner


Tesla list wrote:
> 
> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
> 
> Bart -
> 
> Just finished checking the K factors for Kurt Schraner's BW coil of
> 11/24/01.
> Pos = Secondary above Primary in inches.
> Mark = Mark Rzeszotarski's MandKver31 program. Thank you Mark.
> 
>     Pos     Mark     Java     JHCTES
>                      (Acmi?)
> 
>      0      .1609    .1552     .137
>      1      .1458    .1459     .127
>      2      .1314    .1370     .118
>      3      .1182    .1287     .111
>      4      .1061    .1207     .103
>      5      .0954    .1132     .097
>      6      .0858    .1060     .091
> 
> This is a large secondary coil 15.8" dia x 70" long. It is interesting that
> the program outputs come closer together as the coil is raised and the K
> Factors become smaller. As I said all the program outputs will be equal at K
> = zero. We must be doing something right. (:})
> 
> The data is entered in Java with password "Kurt1".
> I couldn't find if Kurt made any K Factor test using the mutual inductance
> test or the frequency test.
> 
> John Couture
> 
> -------------------------------------------