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1/4 Wave Theories - Trash Them!
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To: "'Tesla List'" <tesla@pupman.com>
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Subject: 1/4 Wave Theories - Trash Them!
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From: Tesla List <tesla@stic.net>
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Date: Fri, 29 May 1998 23:35:22 -0500
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Approved: tesla@stic.net
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From: Bert Hickman [SMTP:bert.hickman@aquila.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@verinet.com [SMTP:terryf@verinet.com]
> Sent: Thursday, May 28, 1998 1:05 AM
> To: tesla@pupman.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.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@verinet.com
> or
> terryf@peakpeak.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 --