Shorting coil gives back more power

[bolt]

The size of the series cap and its use is essential to ensure correct operation found by tuning. The cap acts as high pass filter where the condition of repetitive shorting MODULATES the carrier frequency and provides intense high frequency energy..  The LF carrier is the frequency of the generator pulses. Anything you do at this frequency will immediately  lug back to the generator. However the modulation layer can be syphoned off without disturbing the carrier. This is because the event which created the HF energy no longer exists within this dimension so there is no Lenze effect and thus no lugging after the high pass filter. However the energy recovered is real and often OU.

BTW you don't need a mechanical generator to do this. If you can do all this with a solid state magnet coil setup and a pulse driver then short the pulses. Shorting or quenching is not new Armstrong discovered it about 1922 as Super Regenerative as coil interrupts increase the Q to > million to extract weak RF signals.

[Arthurs]

@Arthurs
That is the core as it comes from the microwave fan.

Thank you very much romerouk replies:

    But microwave fan core is not easy to get, Able to use other materials instead? It is said that the core effect of using Fe3o4 make very good?

Also: Since the use of the core power generation coil, the magnetic rotor magnets should not be too strong? Such as the use of ceramic magnets may have better results?
.

[gyulasun]

Hi Laurent,

The IRF2708 has a bit low V_DS rating, only 75V, the two in series would give 150V maximum peak to peak AC wave shorting, now you have a 80-90V peak to peak generated voltage, if you manage to short it, the peak to peak voltage may exceeds this and burns both FETs.
Here is a selection of the V_DS=200V power MOSFETs from irf.com to some choices, try to pick the lower R_DS types:
https://ec.irf.com/v6/en/US/adirect/ir?cmd=eneNavigation&N=0+4294841672+4294873618

But it all depends where you can order, perhaps you may wish to select from a component seller list? If you show a link to a seller I can choose the best available from them.

The IRF540 has V_DS=100V, so a bit better than the IRF2708.

Gyula

Hi Gyula

I tried your correction on the circuit ( that i got from  the diagram of Doug Konzen) and it works , but i got this very pure sine wave without any spike but with peak to peak 80 and more voltage.

than i tried to modify the hall sensor position to get the spike and nothing happen. Than i simply disconnected the 2 Halls and the scope trace stayed the same.

Than i tried different AC caps and the result is each time very different.

So i have have to go sleeping and perhaps tomorrow will bring some better idea of this really complex thing.

By the way i use now the IRF 540 mosfet  and i intend to order some IRF 2807 with very low on resistance  any advice ?

good luck at all

laurent

[joefr]

Here is one more link for mosfets where you can compare different parameters:

150V
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=retrieveTfg&Ns=Maximum%20Drain%20Source%20Resistance&Ne=4294612182&Nr=AND(avl:uk,searchDiscon_uk:N)&N=4294916792+4294611819+4294607679&Nso=0

200V
http://uk.rs-online.com/web/search/searchBrowseAction.html?method=retrieveTfg&Ns=Maximum%20Drain%20Source%20Resistance&Ne=4294611950&Nr=AND(avl:uk,searchDiscon_uk:N)&N=4294916792+4294611819+4294610906&Nso=0

[e2matrix]

Had some interesting results using a Bedini SG motor type setup and the coil shorting.  Initially I was using the SG motor just because it has 4 magnets N-S as Romerouk said is needed around the rotor.  While it has only 4 I used 2 reed switches 180° apart and offset 90° from the coil (of MO fan).  I put a full wave bridge across the output of the fan coil (very heavy duty high volt high amp unit so probably a lot of loss) and fed that back to the run battery.  Had a scope on it and was seeing nice spikes.  Initially the battery was running down slowly losing a hundredth of a volt every few seconds while charging a small 9 volt nicad on the Bedini SG.  Run battery was a 12 volt Nicad drill motor battery pack.  Nothing spectacular there.

   Then I grabbed a 5ufd 400v cap (not electrolytic) and put it in series with the output from the FWBR.  I noticed the motor run battery stopped losing voltage.  But this did not happen until I disconnected the O-scope!  Fluke 87 used and was reading to .01 volts.  It just stayed at 12.32 volts and I charged two 9 volt Nicads and one 9 volt alkaline (yes they do take some charge) without losing any voltage (or at least less than 1/100 of a volt).  The charges were brief but enough to get the 9 volt batteries from abou 7 volts up to around 9.7 volts.  I then disconnected the 12 volt and ran the Bedini SG off the 9 volt batteries to make sure it was a real usable charge.  These worked for the first time in a while as those particular 9 volt nicads were weak and had not been able to run the motor for a long time.  So no real proof of OU or anything but the sudden jump from losing voltage to running the motor and charging batteries with no drop in voltage looks promising and since I was just grabbing parts I think with some fine tuning it can do a lot better. 
   Also the transistor on the Bedini SG was blown a couple days ago so I just scrounged one off a computer power supply to replace the blown one.  The one on there now is an E13007F2.  Probably far from ideal and I had to lower the base resistor to it down to almost nothing to get the motor to run. 
   I also tried feeding the Bedini output for charging a battery back to the run battery through a FWBR and cap but as soon as anything was hooked up that way the motor slowed and voltage started dropping.  I think there may be a way to do this but I haven't figured that out yet.  If there is a way to do that maybe the combination of the coil shorting and looping the charger back to the run battery might be enough to make a self runner...  I'll admit I mostly shooting in the dark here as I'm not nearly as sharp on this as many people here but this test was exciting to see.  I think the coll shorting holds a lot of promise.