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1/4 Wave Theories - Trash Them!




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From:  Bert Hickman [SMTP:bert.hickman-at-aquila-dot-com]
Sent:  Friday, May 29, 1998 10:12 PM
To:  Tesla List
Subject:  Re: 1/4 Wave Theories - Trash Them!

Tesla List wrote:
> 
> ----------
> From:  terryf-at-verinet-dot-com [SMTP:terryf-at-verinet-dot-com]
> Sent:  Thursday, May 28, 1998 1:05 AM
> To:  tesla-at-pupman-dot-com
> Subject:  1/4 Wave Theories - Trash Them!
> 
> Hi All,
> 
>        I wrote another paper.  What many have suspected, appears to be true.
> Tesla Coils are not antennas.  They are transformers.
> 
> "An Analysis of Top and Bottom Currents in the Tesla Coil Secondary Inductor."
> 
> It can be found as a web page and WORD97 zip at:
> 
> http://www.peakpeak-dot-com/~terryf/tesla/experiments/experiments.html
> 
>         This paper describes measurements of the top and bottom currents in a Tesla
> coil secondary inductor.  These measurements indicate that the secondary is
> acting as a simple lumped inductor.  There appears to be no 1/4 wave effect.
> The currents are in phase.  It appears that the 1/4 wave theory of Tesla
> coil operation is incorrect.  Also, the top terminal appears to be acting as
> a simple capacitor in parallel with the coil's self capacitance.  A model
> for this behavior is presented.
> 
>         You can take all those 1/4 wave models and all those books with
> pretty sine wave current distributions and throw them away (Well.... save
> Tesla's)!  The basic Tesla coil is a simple lumped parameter transformer
> with loose coupling.  Very good news for spice modelers!
> 
> Still need to do some theorizing about the self capacitance........
> 
> Now.... comes the sparks!! :-))
> 
>         Terry Fritz
> 
> terryf-at-verinet-dot-com
>         or
> terryf-at-peakpeak-dot-com

Terry,

Excellent work, Terry! Your simultaneous base and top-to-toroid current
measurements have nailed down one more plank in a growing body of
empirical and theoretical evidence. No sparks or flames from Illinois -
only praise for a job well done!

-- Bert --