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Re........ Measuring Coupling Coefficients
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Thursday, December 11, 1997 3:36 PM
To: Tesla List
Subject: Re: Re........ Measuring Coupling Coefficients
Sorry all, but I cannot let this go....
> From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> Sent: Wednesday, December 10, 1997 6:04 PM
> To: Tesla List
> Subject: Re........ Measuring Coupling Coefficients
<snip>
> Malcolm, All -
>
> Kc equals critical coupling.
Kc does not equal critical coupling. Kc is a number intimately
related to the aggregate coil Q's.
> Coupling is a percentage of flux linkages. At
> critical coupling (Kc) the mutual reactance is Xm = sqrt(Rp^2+Rs^2). The
> Xm,Rp, and Rs are in ohms, but the Kc is not in ohms and ,therefore, not
> "LOSSES". The Kc is still only a percentage of flux linkages.
Nope - see the bit at the end of this piece.
> But if, as you say, the K = 1/sqrt(QpQs) only occurs at Kc then
> critical coupling is dependent on frequency. In other words K is dependent
> on frequency when the coupling is equal to a certain percentage of flux
> linkages (Kc).
I didn't say that at all. I said that *at critical coupling, kc = k*.
> This leaves the question "What is there about frequency and Q factor that
> affects coupling only at a certain percentage of flux linkages?" To me this
> means that with a Tesla coil there are lines of magnetic force from the
> primary and secondary coils that when a certain percentage of these lines
> are linked the frequency is involved. At other percentages the frequency has
> no effect.
>
> Now that K can be found without building any coils, does anyone want to
> set up a program to find the critical coupling of a series of different TCs
> to research the above? The parameters would include K, Lm, Lp, Ls, Q, F, Rp,
> Rs, etc. We may find that TC output (sparks) can be increased even more than
> what we are doing now.
>
> John Couture
Electricity 1: Suppose Q1 = Q2 (just to make it obvious)
Then: 1/SQRT(Q1.Q2) = 1/SQRT(Q1^2) = 1/Q1 = *THE DISSIPATION FACTOR*
What has that got to do with flux linkages??????
Malcolm