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Re: 0.5*C*V*V vaild? (Was Output Voltages and Voltage/Leng (fwd)
---------- Forwarded message ----------
Date: Thu, 12 Feb 1998 19:07:18 +1200
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: 0.5*C*V*V vaild? (Was Output Voltages and Voltage/Leng
Hi Dave, all,
> From: David Sharpe [SMTP:sccr4us-at-erols-dot-com]
> Sent: Wednesday, February 11, 1998 6:11 AM
> To: Tesla List
> Subject: Re: 0.5*C*V*V vaild? (Was Output Voltages and Voltage/Length)
>
> Tesla List wrote:
> >
> > ----------
> > From: Greg Leyh [SMTP:lod-at-pacbell-dot-net]
> > Sent: Sunday, February 08, 1998 6:00 PM
> > To: Tesla List
> > Subject: Re: 0.5*C*V*V vaild? (Was Output Voltages and Voltage/Length)
> >
> > Mark S. Rzeszotarski wrote:
> >
> > > I have done considerable modelling of tesla coils and helical
> > > resonators, examining the theoretical voltage rise under non-breakout
> > > conditions. I have also built a series of tesla coils with back-to-back
> > > LED's placed every 2 inches along the length of the coil with various H/D
> > > configurations to examine the voltage rise in these rather heavily damped
> > > coil systems. Several observations are notable:
> > > 1. The voltage distribution goes from a minimum at the base to a maximum at
> > > the top when tuned to the quarter wavelength of the coil system, even in a
> > > damped coil system.
> > > 2. Adding a toroid or sphere to the top tends to linearize the voltage rise
> > > somewhat, so that the turn-to-turn voltage stress is lessened especially
> > > near the top of the coil.
> >
> > I have also noticed in PSPICE that the voltage dist
> > along the sec becomes much more linear when a large
> > topload is added.
> > If the voltage dist along the sec is mostly linear,
> > then is it reasonable to treat the sec ckt as lumped
> > elements, and forget the 'antenna theory' treatment?
> >
> > -GL
>
> Mark, Greg, ALL
>
> Duane Bylund has been stating this last hypothesis suggested by
> Greg since his book "Modern Tesla Coil Theory" was introduced
> in 1992.
>
> Regards
>
> DAVE SHARPE, TCBOR
I was loaned this book just a couple of weeks ago and found myself in
general agreement with a lot of Duane's conclusions also. Issues
pertaining to primary Q, gap losses etc. were omitted but his
main emphasis was on solid state drivers. A nice bit of work IMO.
Thanks for mentioning that.
Malcolm