Re: Twin coils - PSpice model development

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <Rscopper-at-aol-dot-com>

Antonio,
Thanks for your input.  The circuit you've described is close to what I've 
started with, see :
<http://www.hot-streamer-dot-com/rscopper/circuit1.jpg>http://www.hot-streamer-dot-com/rscopper/circuit1.jpg

PSpice output:
<http://www.hot-streamer-dot-com/rscopper/trace1.bmp>http://www.hot-streamer-dot-com/rscopper/trace1.bmp
output with shorted secondaries:
<http://www.hot-streamer-dot-com/rscopper/trace1.bmp>http://www.hot-streamer-dot-com/rscopper/trace1.bmp


What is missing is the coupling between secondaries.  That's why I was 
asking for some actual measurements vs. calculated values.  Many twin 
systems have been built, but I don't think they have been studied as well 
as they could. It's difficult to operate coils as large as my Twins and 
take measurements (in my front yard anyway).  I don't have a table-top twin 
system to experiment with (yet...)

I don't think a bipolar coil arrangement has the same variables as a twin 
system either because of interactivity due to proximity and transmision 
line characteristics.

As we build Gemini, the more we understand the system, the easier it will 
be to optimize and tune it.

Scott


In a message dated 7/12/2003 9:46:54 PM US Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

>Original poster: "Antonio Carlos M. de Queiroz by way of Terry Fritz 
><teslalist-at-qwest-dot-net>" <acmq-at-compuland-dot-com.br>
>
>Tesla list wrote:
> >
> >Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
><Rscopper-at-aol-dot-com>
> >
> >To all of you that have built a twin coil system:
> >
> >I'd like to get a good PSpice model developed for twins.  Have any of you
> >done measurements of resonant frequencies while the secondaries are not
> >arcing together vs. when they are arcing together?  I haven't been able to
> >capture much on a scope to develop a good theory.  Anyone have a spectrum
> >analyzer I could borrow?
>
>Basically, the primary side has a capacitor and two inductors in series.
>The two secondaries are grounded inductors in parallel with capacitors.
>The primary inductors are coupled to the secondary inductors, one to
>each. Add resistors if you want a less ideal model. Start the simulation
>with an initial voltage at the primary capacitor, if you just want to
>see the energy transfer.
>
> > >From my observations with my Twins, I think the secondaries operate at
> >multiple frequencies depending on coupling to closest primary, coupling to
> >other secondary, and whether or not the arcs connect between secondaries.
>
>The circuit described above oscillates at 4 frequencies if the
>secondaries
>are disconnected (no spark) and at 3 frequencies when they are
>interconnected by a short-circuit (ideal spark). If the system is tuned,
>cancellations shall reduce the oscillation frequencies to 2 and 1,
>respectively.
>
>Antonio Carlos M. de Queiroz
>