OU Possibilities for Transmitted Power using Resonance

[ewizard]

Fascinating info here jibbguy. Thanks for starting this thread. Having bought Don Smith's book many years ago I think one of the basic concepts I recalled from his info was along this line. That is you could get OU when using multiple resonant coils running from one transmitting coil as long as all were resonant they didn't draw any more power than one would.

[jibbguy]

Your welcome

Here is the Wiki usual ds-info, this time about WiTricity (what these MIT guys have called it and apparently the name is sticking)...

They don't mention Tesla's name (who clearly discovered it), and they OF COURSE, do not mention it's "special features"

Their "reasoning" for why has not been pursued before is also "interesting".

WiTricity - Wikipedia, the free encyclopedia

Here's Geller's company site with lots of interesting data on it (but NEVER mentioning multiple receivers lol)

WiTricity Corp. — Basics of WiTricity Technology

One thing that is interesting, is that the above claims efficiencies of over "90%" are possible (for single-paired transmitter/receiver sets, not multiple receivers, as the thread-starter link shows that cross-coupling between the receivers could lower that efficiency).

[boguslaw]

IMHO it's another attempt to lead us into misconception that OU is not possible now also for wireless power transmission.The same game as for electric current generation , based on fossil fuels.

[jibbguy]

Well, we knew that Wikipedia is disinfo when it comes to anything related to F- E . And that site is about making money... No one who wants to court mainstream electronics manufacturers is gonna mention "F-E"

The PhysOrg article, and the paper linked there (regarding the multiple receiver coils), looks "legit"...They are just stating findings. It is me, and others, who have said it was OU based on the implications, not them... I am quite sure they never could have Published, and would have had their funding pulled , if they had set out to claim OU.... openly that is

Maybe we were MEANT to do something with this that these scientists CANNOT, since they work within a very controlled system and we do not. Not all of them are money grubbing sociopaths lol.

What we could do to capitalize on this little gift we were given (an opportunity really), is to show a working multiple receiver setup producing energy at OU levels (even COP>1.5 or COP>2 would do the trick), and get that out there loudly shouting:

"M.I.T. replication here !!"

...THAT would put some suppressing jerks into a real quandary, hehehe.

Someone want to twist some tails? Break some round thingies? Get something positive moving towards Disclosure?

This would be a good way to do it, i think.

[baroutologos]

In continuation of my experimentation with resonance concepts, i utilized my Solid State Tesla coil (Kacher) and assembled 2 similar in all aspects receivers.

All have 75mm PVC core, 0.5mm enameled wire, same technic tightly wound, 580mm height, inductunce 10.94 mH with same LC meter and same topload.

Minor deviations in resonance exist (as proven later) due to infitesimal differences between the coils.

...
I used my Kacher to pulse the transmiter resonator at 100watt power and 30watt.
both receivers having same low turns coil for applying the load (45watt, 12v bulb) were possitioned in various radii from transmiter and played with un-evened loads at each receiver.
Bottom of receivers for manifesting resonance were both grounded.

...
Findings:

After experimenting several hours (my head almost fried) and in various possitions and loads i can clearly see how the main resonator's energy is distributed between them.
If one gets loaded upon a certain degree the other gets weaker. There is a "sweet spot" in applying a combination of distancing and load, but in all cases the overall effect is 60% of power used max.
With one receiver the efficiency is lesser.

I cannot perceive any reason why with 10 receivers (assuming had enough space) anyone should expect OU. But the more, the higher the efficiency transfered.
In all cases, the transmitter (unless receiver is brought quite close) remains unaffected in consumption terms.

When goin down in transmitter power (30watts) receiver power diminished linearly as expected.
I managed to attain a wireless power transfer of 30-40% efficiency at 1,5-2m. Better Q resonators would have better results of course.

conclusion
...
Mine conclusion is this is a fun yet lossy procedure.

[baroutologos]

Regarding resonance setups, an oddity in my oppinion is the following.

If i apply to a resonating LC system a secondary of few turns that has a load fixed, the the whole system "slows down" naturally.
IF the same secondary is shorted (no load applied) then little if any resonance diminishing is observed.

...
In my case with the Kacher transmitter and the two receivers, if one is loaded then max lamp brightness is attained. If both are loaded, brightness is diminished and by making correct adjustments (impedance matching) you have a more or less split of power.
BUT, if one receiver has his secondary SHORTed, then other outputs full power as if no other load is applied.

The same thing with my Kacher running the magnifier coil. If in few turns coil (that is wound near to secondary) a bulb is applied, resonance diminishes. if it is shorted, resonance is mainly unaffected.

...
A remote resemblence i have experience in the past with mechanical setups as Thane Heins perepiteia. Ashorted coil under some circumstances poses no load, whereas if loaded then posses.
...

This simple phenomenon puzzles me considerably. By considering standard transformer theory that should not happen. A shorted secondary that allows max current development on it should pose max load. Obviously not the case.

two things come to my mind. A dead load (resistance) interferes with current phasing or just the traditional concept of mutual inductunce that leads to diminishing inductunce etc holds no true.

Your views?

ps: unshorted Kacher consumption 4A @26v, under load 2,8A @26v, shorted about 4A@26v

[Zooty]

Hmmm multiple receivers all at the same resonant frequency would require the exact same load on each? So maybe the first step is to connect all the receivers to the same CONSTANT load. The load theoretically should be equally shared between the receivers doing away with a lot of the tuning. This would be a good experiment with a SEC exciter and multiple identical receivers. Just my thoughts on it.

[Harvey]

Perhaps if we look at the process of a shorted output from a different perspective:

If the shorting wire is of sufficient cross section that it has little resistance then we can expect the voltage differential across the short to be very small even though a considerable current may be flowing. However, apart from the winding resistance and shorting wire resistance, the current is unable to express as real power and is represented as a magnetic field by self inductance. This energy stored in that field is returned to the primary and the event is viewed as apparent power. The only part used as real power is that part where current flows through the resistance of the wire which is very little.

So a shorted secondary in which the winding wire has a good cross section will not appear as a big load to the primary even though current is flowing in that winding, the energy is given then taken back.

In a resonant primary, the energy is moved from one side of the primary back to the other side of the primary and this is how it resonates. But, if we take some of that energy out and give it to the secondary to be dissipated, as in a load, then the resonance suffers because it is losing energy. For example, a child on a swing will keep going high both ways with little pushes - resonant - but if they give away energy by kicking some dirt, then the frequency changes and demands more energy put in to bring it back.

[boguslaw]

just connect receivers in series while outputs of receivers in parallel then connect ONE common load to the ONE common output