RE: Mega-Sized Secondaries

[Terry Fritz <twftesla-at-xxxxxxxxxx>]

Hi John,

At 06:11 PM 11/1/2000 -0800, you wrote:
>
>Terry -
>
>Thank you for the secondary current information. Your ma currents appear to
>me to be too low for instantaneous secondary currents. What equations did
>you use to calculate them? 

Those are RMS values that were from my coil's MicroSim model.  This
powerful circuit simulator does such things with ease.

>I also am working on the problem and will post
>the results on the List shortly. I still do not understand what Paul meant
>by the charge conservation losses in the secondary coil. Or did I
>misinterpret his comment?

He probably meant losses to the dielectrics (Sonotube comes to mind :-)) in
the form of heat, eddy current, and ohmic losses in the wire.  He is VERY
knowledgeable of such things.  Of course, he never meant to imply that
energy was created or destroyed or anything silly like that.

>
>Charge conservation like energy conservation is a fundamental electrical
>concept but what equations is he using? Are they the fourth order
>differential equations that the Corums showed in their TCTUTOR? Are these
>the equations your Linux computer is using? I would be interested in the
>Linux results although I do not consider myself a "pure science" type.

You may want to get on his TSSP project list.  The programs are pure number
crunching to the extreme but the results are amazingly accurate.  They are
very basic fundamental formulas that are set up to be done zillions of
times by the computer.  You, like me, are probably looking for nice closed
for equations to put in your programs ;-))  However, the stuff is a bit too
young yet for that but converting the graphs to close approximation
equations is coming fast!  I have been especially exited to learn that the
voltage profiles in E-Tesla5 are wrong and the new data will definitely
help that program to be much more accurate in version 6.  All those odd
errors are now explained and relatively easy to fix once the 'fast' closed
form equations can be determined.

The "pure science" stuff is pretty heavy (keeping me little brain busy ;-))
but it will trickle down pretty fast!

Cheers,

	Terry

>
>John Couture
>
>--------------------------
>
>
>
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Sunday, October 29, 2000 6:02 PM
>To: tesla-at-pupman-dot-com
>Subject: RE: Mega-Sized Secondaries
>
>
>Original poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
>Hi John,
>
>	Paul's program is running on my other Linux computer right now!  Perhaps
>the heavy computing is better suited to the pure science types than the
>average TC builder at the moment :-)))
>
>As far as the currents go.  "I" would say it is roughly proportional to the
>ratio of self capacitance and top load capacitance compared to total
>capacitance.  Of course, Paul's program may change that rule, but for 'this
>moment' that's what I go by...
>
>My lumped models predict for my big coil:
>
>Cself 15.7pF
>Ctop 28.5pF
>Ibase 320mA
>Iself = 103mA
>Itop 190mA
>Istreamer 27mA
>
>Cself + Ctop = 44.2pF
>
>15.7 / 44.2 x 320 = 114 mA  (close to Iself)
>28.5 / 44.2 x 320 = 206 mA  (close to Itop)
>
>If I could rationally account for the streamer current, these numbers would
>be closer.  But we'll wait awhile until The TSSP project and all the number
>crunching confirm such lumped predictions before getting too carried away,
>but I bet they will still be close...
>
>Cheers,
>
>	Terry
>
>
>At 12:59 PM 10/29/2000 -0800, you wrote:
>>
>>Paul -
>>
>>Checked out the website. Four days to compute one Tesla coil parameter! Do
>>you have something much faster that could be used in a program that
>>coordinates and calculates about 46 TC parameters?
>>
>>Regarding the charge conservation what is the approximate overall percent
>>difference between the current at the bottom of the secondary compared to
>>the current at the top of the secondary coil? Could you break this up into
>>corona losses and charge conservation? The charge conservation is new to
>me.
>>
>>John Couture
>>
>>--------------------------------
>>
snip...