RE: Bart's Coil

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Bart -

I have been reviewing my tests made in 1990 and it appears that I am going
to have to study them further. I was wrong when I said I made the frequency
tests without a primary capacitor. These tests were for finding the change
in inductance using the equation
        K = sqrt(1-Lo/Ls)^2
This is the test I show in the TCC Guide. I used several different methods
for finding the K factor and I am having difficulty sorting them out.

Thanks again for sharing your K test results with the List. Will have to
revist the K factor at a later date.

John Couture

-------------------------------

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Friday, November 30, 2001 8:52 PM
To: tesla-at-pupman-dot-com
Subject: Re: Bart's Coil


Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi John -

Yes, there is a mathematical representation of K, but Fo and Fs are both
unknowns. So a relationship only exists following measurement. And we are
back
to square 1 again. I'm not closed minded to the idea, but what tests can be
performed to find a relationship between Fr and Fo? Have you tried modeling
your tests in Microsim or similar application? That would probably be a good
place to start checking.

--
Barton B. Anderson
<http://www.classictesla-dot-com>http://www.classictesla-dot-com
Tesla list wrote:
>
> Original poster: "John H. Couture by way of Terry Fritz
<twftesla-at-qwest-dot-net>"
> <couturejh-at-mgte-dot-com>
>
> Bart -
>
> In my tests I did not use a primary capacitor so the test frequencies are
> not arbitrary. As shown in the TCC Guide only the primary and secondary
> coils are used. I wanted to eliminate the effects of primary and toroid
> capacitances. I found that the Fo test frequency was almost half of the
> secondary resonant frequency Fr. In other words the bare secondary coil
had
> the same effect on the primary coil as a large primary capacitor. I used
> small coils and would expect that with large coils there would be less
> frequency reduction from Fr.
>
> Note that there is a relationship between the Fo/Fs ratio and the
secondary
> resonant frequency Fr. The equations are
>
> Eq #1      Fr = (1/6.283)sqrt(Lp/(Lm/K)^2xCc)
>   The Cc is the coil self capacity of the secondary.
>
> Eq #2       K = sqrt(1-(Fo/Fs)^2)
>
> Subsitute Eq #2 for K in Eq #1. It is obvious that Fr and Fo/Fs are
related.
> But is there a relation between Fr and Fo alone? In both the Fr and Fo
tests
> the same bare secondary coil is used but the two frequencies are much
> different. More testing is required.
>
> John Couture
>
> -------------------------------