[Prev][Next][Index][Thread]
Re........ Measuring Coupling Coefficients
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Tuesday, December 09, 1997 10:12 PM
To: Tesla List
Subject: Re........ Measuring Coupling Coefficients
All,
I don't know how many times I should post on this one.....
> From: John H. Couture[SMTP:couturejh-at-worldnet.att-dot-net]
> Sent: Tuesday, December 09, 1997 2:01 AM
> To: Tesla List
> Subject: Re........ Measuring Coupling Coefficients
>
> At 04:59 AM 12/8/97 +0000, you wrote:
> >
> >From: terryf-at-verinet-dot-com[SMTP:terryf-at-verinet-dot-com]
> >Sent: Sunday, December 07, 1997 7:01 PM
> >To: Tesla List
> >Subject: Re........ Measuring Coupling Coefficients
> >
> >All,
> > Mark's program will be a major benefit to those who do Tesla coil
> >modeling. The mutual inductance between the primary and secondary coils has
> >always been a very difficult factor to predict. This will provide one of the
>
> >--------------------------------------------------- snip
>
> I agree that Mark's program will be a major benefit to TC design.
> Hopefully it will eventually be incorporated into a comprehensive program
> that will calaculate all of the necessary TC parameters and automatically
> keep them in tune when changes are made like the JHCTES program. The more of
> these programs that become available the better for coilers.
> JHC
> ----------------------------------------------------- snip
>
> >The equation Q = 6.283 F L does not sound correct. The equation 6.283 F L
> >is equivalent to the inductive reactance of a single coil, not it's Q.
>
> --------------------------------------
>
> You are correct. The equation should be Q = 6.283 F L / R
> The Rp and Rs are related to mutual reactance by Xm = sqrt(RpRs).
> JHC
>
> -------------------------------------------------------- snip
>
> The equation ( K = >1/sqrt(QpQs) ) will predict a K of 0.0527 but does not
> take into account
> >that the two coils are separated by 150 feet and thus have a K of zero.
>
> ------------------------------------
>
> The K - 1/sqrt(QpQs) is for mutually coupled coils so the K would not be
> zero.
> As Q depends on F it would appear that coupling depends on frequency. I
> havn't seen an explanation for this contradiction with other K factor equations.
> JHC
...but post I did not two days ago. k <> kc!!!!!!!!!!!!!!!!!!!!!!!
Call kc anything you like other than k!!!! It simply describes
*LOSSES*, not coupling.
Sheesh,
Malcolm
<snip>