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Re: Info and requests for book
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Wednesday, September 17, 1997 3:08 PM
To: tesla-at-pupman-dot-com
Subject: Re: Info and requests for book
Terry,
*All* your queries have comprehensive answers in the list
archives. We cracked the Cself one several years ago.
Vout = Vcp x SQRT(Cp/Cs) where Cs = Cself + terminal capacitance.
This equation assumes infinite Q. An artificial line model of the
secondary was developed and measured just a few weeks ago.
Welcome aboard,
Malcolm
> From: terryf-at-verinet-dot-com[SMTP:terryf-at-verinet-dot-com]
> Sent: Tuesday, September 16, 1997 11:43 PM
> To: tesla-at-pupman-dot-com
> Subject: Info and requests for book
>
> Hi,
> My name is Terry Fritz and I have been playing around with high
> voltages both professionlly and for fun for many years (23). Just joined
> this group and I am interested in what's been going on in the world of Tesla
> Coils. I have always had this desire to write up a paper or GBC bound
> "book" on Testla coil design. I have the ones from Duane Bylund and D.C.
> Cox and I think I could add a great deal of info. Coupling coefficients,
> secondary coil design, and secondary terminal design seem to need more
> detailed explanations and info. Since these require either heavy math or
> computer analysis they tend to get left out. However, They are VERY
> important. If any one has a "wish list" of things they would like to see in
> a Tesla Coil design book please drop me an E-mail at "terryf-at-verinet-dot-com" .
> >From what I have seen here and in the archives it looks like capacitors,
> secondary inductors, and power sources are the big issues. I guess I am
> somewhat surprised that there is so little theory. I am looking for any
> info on the following:
>
> 1. Any information on the losses on the secondary such as secondary
> terminal capacitance change vs voltage, Energy loss vs voltage and time,
> ect. would be useful.
>
> 2. Has anyone tried using varistors (transient surge absorbers) instead
> of spark gaps for transformer protection? I realize they my need to be
> isolated with chokes due to their capacitance but in quantity they are
> fairly inexpensive (1800V 4500A $1.88ea from DigiKey) and they can be easily
> chained together to reach a desired voltage. I would think they would give
> much better protection than a spark gap.
>
> 3. Any info on predicting secondary parasitic capacitance or resonant
> frequency. This is a big killer for most Tesla coils and the info I have
> seen tends to fall far short of what is needed. There are certainly better
> ways to wind the secondary to reduce this capacitance but I have never seen
> any good details on doing this. The programs and equations I have seen have
> never predicted any of my coils very well at all. Virtually all Tesla coils
> tend to be big delay lines instead of antennas.
>
> I guess I am one of those who never saw too much mystery in how Tesla coils
> worked (although getting all the variables to work together is a challenge).
> I guess it is time to finally put this all in some kind of book. I hope
> this doesn't take too much of the magic out of Tesla coiling but I feel that
> there needs to be better basic info. Thoughts / Comments let me know.
>
> Terry
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