Re: Iron transformer positioning under the primary experiment

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

Hi Again,

I put a piece of copper under the primary like this:

http://drsstc.com/~sisg/files/SISG-coil/PrimaryQ-10.jpg

http://drsstc.com/~sisg/files/SISG-coil/PrimaryQ-11.jpg

It hardly made any difference!!!  The magnetic fields around the 
primary must stay very close the the coil!!  I don't know if there 
are any magnetic field mapping programs out there that could show this?

But it appears you can put metal objects really near the primary!!

Cheers,

        Terry






> Hi Scot,
>
> It is not easy to fine the answers you and I seek, but I was able to 
> do it today:
>
> MOT position                            Rac(Ohm)        Lpri 
> (uH)       Power Loss (W)
>
> No MOT                          0.14            3.19            0
> MOT in worst position                   0.20            3.25            11.76
> MOT in expected build position          0.148           3.19            1.57
>
> http://drsstc.com/~sisg/files/SISG-coil/SISG-TPtest-FollowUp.pdf
>
> On a conventional lossy spark gap coil, even a very close MOT in a 
> bad position would not be noticed.  We often see coils with 
> transformers and such under the primary.  It might be the case that 
> their added losses are not too great.  But the open core MOT will 
> reject eddy and sorted turn currents.  That is not the case for say 
> a NST cover.
>
> Cheers,
>
>         Terry
>
> At 05:09 AM 7/6/2006, you wrote:
> > Still wonder how much voltage/inductance etc. is being absorbed by 
> > the core/windings of the transformer..... and if the windings are 
> > being effected by the primary ( increased/decreased voltage)  and 
> > by how much...
> >
> > Scot D
> >
> >
> >
> > Tesla list wrote:
> >
> > > Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
> > >
> > > Hi,
> > >
> > > For my new little coil, I have to position the big iron MOT 
> > > "somewhere".  So I did some testing that I wrote up here real fast:
> > >
> > > http://drsstc.com/~sisg/files/SISG-coil/SISG-TPtest.pdf
> > >
> > > Looks like "directly under the primary" is the sweet spot!!
> > >
> > > Cheers,
> > >
> > >     Terry