Original poster: Vardan <vardan01@xxxxxxxxxxxxxxxxxxxxxxx>
Hi Bart.
At 06:55 PM 7/6/2006, you wrote:
Cool Terry!
Referencing the white "reference", the loss when the MOT is center
to the flat coil is negligible. Interesting how the loss was 5 to
10% when the MOT was 2" below and near the outer section of the
coil. It would be sweet to see a magnetic field map of a flat
primary. It would certainly help us visualize the situation.
This is what Ansoft's Maxwell 2D thing does:
http://drsstc.com/~sisg/files/SISG-coil/FieldPlot.jpg
It is not my coil but just a test I did to see how the program
works. It is one of those "odd" mid 80's engineering programs that
has been updated over the years. Seems to work fine but has long
awkward data inputs and a lot of "personality". But it is powerful
and is "free" :-)))) One could probably study it for years trying
to figure out all its little tricks...
http://www.ansoft.com/maxwellsv/
Here is a basic manual someone wrote that one can read through fast
to get an idea of how to make it "go".
http://coolmagnetman.com/basic_user_manual.pdf
Funny that it was probably made to really rip on a 486-33DX
:o))) It has no problem on a 3GHz with a gig of RAM :D
Did you also perform the test with a secondary in place? I wouldn't
expect a change in MOT placement affect, but thought I'd ask anyway.
No but I did try a copper plate about 1.125 inches above the primary:
http://drsstc.com/~sisg/files/SISG-coil/CopperTest.JPG
http://drsstc.com/~sisg/files/SISG-coil/CopperTest1.gif
It actually has less loss than the transformer in a bad place
(white)! The copper has "high Q" so it's eddy currents tend not to
loose a bunch of power. Cool isn't it ;-)) Steve and Dan mentioned
this and they are right!!
In the first Ansoft plot above you can see how close the energy
stays to the primary coils. This free version is just 2D but it
tells us pretty much what we want to know. I'll have to fiddle with
it more to do something more real.
Cheers,
Terry
Take care,
Bart
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