RE: [TCML] NST Measurements

["Godfrey Loudner" <ggreen@xxxxxxxx>]

It's too bad we can't get hold of the sophisticated software companies use
to design transformers. The ones I saw advertised on the web cost about
$80,000 or can be rented. They seem to use finite elements to deal with the
horror of the differential equation involved. The programs can even deal
with the thermodynamics of the transformers. I'm beginning to believe that
the details of the mathematical methods are kept secret for financial
reasons. The software Mathematica keeps some of their methods secret and
that is a real horror. It would be much fun to enter the geometry of a mot
or NST and run the calculations in particular cases. 

Godfrey Loudner  

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Tuesday, January 20, 2009 8:38 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] NST Measurements

Hi Dave,

Yes, I agree. The magnetic shunts are causing the non-linearity. As I 
mentioned a moment ago in my reply to Phil, the voltage ratio is 
non-linear because of this. Were trying to use the voltage ratio to 
determine turns ratio. This won't work "IF" the shunts have influence 
because it affects the voltage ratio. I think everyone measuring is 
seeing this affect.

The problem I have is the inductance factor is based on the turns ratio. 
So, how to remove shunt influence? The only way I can think of is to use 
"extreme" low voltages. Maybe instead of inserting 120Vac to the 
secondary, we need to bring down the voltage to something between 1 and 
10V input to the secondary and measure the millivolts at the primary? 
There must be a point at which the shunts have little affect and the 
voltage ratio becomes linear enough for a decent approximation.

Take care,
Bart



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