Eliminating induced emf in motor and transformer.

[broli]

I made a post about this on EF but can also be useful here. Plus I made some proper renditions this time.

We all know that induced voltage due to some changing field is V= N dɸ/dt or rewriten to V = N A dB/dt.

So I was thinking, what if we had two coils, that experienced approximately the same dB/dt and had equal N*A. When both such coils are hooked in series, the induced emf due that field change should cancel in the total circuit. So electrically we are fine. What about mechanically.

I ran some simulations and discovered that when this two coil circuit was powered with any current the coil with the smaller area and larger turns has a dominating field strength. In other words when powered this can attract or repel a magnet for instance.

So now we combine the two, on one hand we have a setup that it's completely oblivious to changing fields, and on the other this setup can perform mechanical work.

So for instance. If the small coil has an area of 1cm² and the bigger one 4cm², then the small coil must have 4 times the amount of windings of the large coil.

small coil: 1cm² 100 turns 1A
large coil: 4cm²   25 turns 1A

It's actually not that hard to see why the small coil is dominating field wise. Field density is only turn dependent.

The tricky part is keep the flux density as uniform as possible through both coils. By using a large enough magnet for example.

[broli]

Wait a second, if all we need is an uniformly changing field density through both. What would happen if these two were put in the middle of a longer coil. According to the sim the average field density through the whole setup (thus flux) is again hugely in favor of the smaller coil. If these two were set to oscillate inside a bigger coil, this bigger coil would see a constant flux change. And thus induce its own emf which results in flux. But since the two oscillating coils are oblivious to outside uniformly changing flux they won't be affected at all. Thus the primaries so to speak remain completely inductive, while "unlimited" power can be tapped from the secondary.

I have no doubt that when tweaked both coils cancel a uniformly changing field, especially if the source is another coil which they are placed at the center of. What should be tested if indeed the simulation result is correct, and that they have a non zero net average flux when powered. But this is the natural next experiment after the green coil has been tweaked properly.

[penno64]

Hi Broli,

Is this not along the lines of what Thane was showing with a HV coil and a LV coil in close
proximity.  I think in his video, he said that he used MOT coils.

Regards, Penno

[broli]

A so called HV coil or a coil with many turns should geometrically have a smaller area compared to the LV coil or a coil with not so many turns. Thane never has put any emphasis on this as far as I know.

Any known technology aside, the last setup is a relatively cheap experiment to form a conclusion about the theory.

[penno64]

Hi Broli,

Sorry, I should have typed, HC (high current) and HV (high voltage) coils.

I have been searching his videos to find the pertinent one.

Soon as I find it, I will post a link.

Regards, Penno

Start at this one - http://www.youtube.com/user/ThaneCHeins#p/u/22/V_UXcNMBGTA