Tesla's "notes" on unipolar dynamo's.

[scotty1]

Hi all.
Tesla likes to write in a progressive way...lots of ideas in between, but surpassed at the end.
The early discs were no good because the disc was mostly a short circuit for current.
Tesla showed how you could put coils around the disc edge to improve it.
Then he showed that there was 2 current paths...
One would demagnetize the magnet.
One could keep the magnet magnetized....if you keep the disc spinning.
Then he showed how to sub-divide the disc to collect the correct current path.
Then he showed that if you did that you would need to join the divisions with a ring ect.
Then....after some more chatting...Tesla showed that the best way was to have a disc with some windings around the edge, and then a closed ring over that to collect the current.
"The action of the eddy currents may be utilized to excite a machine of any construction" N.T
THEN.....he said that you could use 2 discs with wide flanges, and a conducting belt to join them.
DYNAMO ELECTRIC MACHINE http://www.rastko.org.yu/cms/files/books/46c5b771b7e2f.pdf

cheers
Scotty.
BTW...i'd like to make that device, but to do a good job is alot of work. I did make a model about 2 years ago but went no further.
I can get metals cast for mates rates  now, so maybe next year I could make a decent replication.

[Koen1]

@CrazyEwok: the "spiral subdivided disc" is interesting...
I thought he meant to basically cut the metal disc into a
flat "pancake coil"-like spiral, in other words use a 'ribbon'
wire instead of a normal round one and wind a flat pancake coil,
starting from the center and winding each turn around the next turn,
while keeping the 'ribbon' flat on the table surface...
With a normal "pankace" coil we'd get a magnetic field geometry
where the field "lines" are stronger and more coherent in a
horizontal plane parallel to the coil surface, basically on each
side of the pancake the field lines run between center and rim.
With a more widely wound and thus more spirally shaped coil,
there would be less of this typical field geometry and more of
a "normal" coil field geometry, which would align a little better
with the homogenic field of the permanent magnet.
Also, but I am not certain of this, it would seem that such a spiral
arrangement might (partially) combine the direction of rotation
with the direction of output current. This is a fairly heavily Hall-effect
inclined interpretation: circular electron currents have a similar
(if not identical) effect as a rotating conductor when used in a homogenic
magnetic field in that they both generate a current that is perpendicular
to both the magnetic field and the direction of movement/current.
One could speculate that using the output current as "feed" current,
in combination with the magnetic field, one might be able to amplify
the effect. However, it seems to me that a "simple" spiral coil,
with or without the 'ribbon' wire, would not automatically generate
currents in such an arrangement as to produce such an amplifying effect.
It seems to me that such an arrangement would need two intersecting
spirals so that the output current of one spiral may act as the input current
for the other and vice versa.
And if I am not mistaken Tesla did carve overlapping "spirals" into the surface
of some of his experimental homopolar discs. Carving a spiral in a metal disc
would increase the conductive surface locally, allowing for a little more freedom
of movement for electrons, so currents would concentrate along those carved lines.
Or at least, I seem to recall Tesla speculating about that. (Perhaps more observation
than speculation, after all, it is Tesla.)

[Shanti]

LOL. Again a story about Tesla, of someone, who didn't really read his texts or didn't really understand them. Sorry if this was rude. But this happens so often, that I really get sick of it...

To make it short:

Tesla mentioned, that if one makes the conducting plate part of the homopolar generator not as one piece, but as a spiral, then, the generated current will flow through this "spiral". But as a spiral in which current is flowing is always generating a magnetic field, you can turn the spiral in the right direction and the generated field will help the otherwise needed externally magnetic field. You can even go so far, as to not use any external magnet, and just spin the spiral. The slight magnetic field of the earth will start a small current, and the spiral will then start to generate an magnetic field, which will then induce a stronger current in the homopolar generator, which will again generate an even stronger magnetic field, ...
This Tesla called a self exciting generator. With this he just meant, that the generator is producing his own magnetic field, and not, that the generator is producing more energy or any overunity!!!
You could just as good just take a very strong external magnet, to have the same results. But with this self exciting method you don't need it. This makes such a generator much easier and cheaper to build. As usually the magnet part is the hard part to get/construct.
But be sure, as the current gets stronger, and so also the magnetic field, the power needed to turn the generator also increases!
If you don't believe it, try it!

[CrazyEwok]

Lol... unfortunately i do not believe that overunity on a small scale will happen in my life time. Massive generators used to power cities... maybe but unlikely i am more looking at highly efficient ways of producing electricity... The one thing that always confused me about Tesla is that while he had "limitless" power at his disposal he was always making things more efficient... if he had an invention there would be multiple revisions... not just to fine tune it but there are countless revions in his patents that simply refer to efficientcy?!? I already believe that there is more than enough electricity being generated for everyone to use it is just cheaper to buy things that are inefficient due to materials costs and R&D. So we use aincent technology because it is tried and tested to work... whereas i think we should be looking at getting things that do the same job but are more efficient... I am hoping that my final idea ( coils into a coil) then having two that switch sides halfway in the disk will produce promising results in efficientcy...

Just a question though wouldn't the magnetic field that you create on the disk help with rotation of the disk itself? not saying that it would produce overunity because of force required to rotate would not be equal to that of magnetic force utilized in propulsion... hmmm might need to get myself a tacho for my experiment...

[Shanti]

The one thing that always confused me about Tesla is that while he had "limitless" power at his disposal he was always making things more efficient.

As far as I understood Tesla, he didn't develop with every invention he made a FE-Device, like many many people here think...
His best idea was his "Magnifying Transmitter", as he himself said, and also this doesn't just "produce Energy". The main goal of the Magnifying Transmitter was to transmit power over the whole earth, so that the cabling wasn't needed anymore, and mainly, that the power plants which generate the power could be built anyhwere on earth, where there are natural ressources (waterfalls, geothermic energy, ...). This could also be in the middle of nowhere...

Just a question though wouldn't the magnetic field that you create on the disk help with rotation of the disk itself?

Why should it???
It would be the same, as if you would add an additional permanent magnet on a conventional homopolar generator. This also does not help  with the rotation...