Shorting coil gives back more power

[Feynman]

I agree that shorting might have a lower COP, but if you make the magnetic field you're shorting very strong with neos you'll get a hell of a bang I'd say.

Mario

Also coil shorting devices are much simpler to make and require much less specialized components.   Thus , more people , potentially , can replicate and experiment.

[Feynman]

what do think of this schematic ?

This helps too -- thanks .   My one question now (forgive my complete ignorance on these circuits) is where does the input AC come from in 'solid-state' coil shorting devices? 

[gyulasun]

@popolibero

Thank you , this is EXACTLY what I was looking for.   The one thing that is missing is schematics for 'solid state' coil shorting circuit   , but this is a start.   Thanks.

Hi Feynman,

The 'missing schematics' for solid state switching is not missing lol it is just there in the link popolibero linked to.

There are two schematics above the scope shot and the two left hand side arrows with the "To Coil" label goes exactly the the coil to be shorted.

And the two schematics under the scope shot includes an SW1 switch which symbolizes the solid state switch. 

So the solid state switch is the two MOSFETs as shown connected in the first two schematics above the scope shot, ok? 

To answer your last question just above: the input AC comes by induction into the coil(s).

Gyula

[popolibero]

Maybe there has been a misunderstanding. One thing is to short the coil in solid state, this is shown in the hall triggered two fet circuit (link).
The other thing is to induce AC into the coil to be shorted. This you can do with magnets on a rotor or solid state, which is what I explained in an earlier post. In order to get rid of the motor/moving magnets I replaced that with a coil that has a parallel cap tuned to be resonant at a certain frequency. This coil I drive with a 555 circuit + fet with very short pulses. At resonance the resulting wave in this power coil becomes a sine wave. This means the magnetic field does the same, it induces an alternating field into the generator coil (the same I used in the rotored version) sitting on top of the drive coil, so the result is the same as having a moving magnet.

What comes in handy in this setup is that since the DRIVE pulse happens at the peak of the resonant AC wave, I can use the same 555 signal to drive the shorting circuit of the generator coil.

Mario

[Feynman]

Haha okay , I thought this had moving parts since the magnet is shown in different positions in the lower set of diagrams  (thought it was a magnet on a rotor).  My mistake...

I'll pick up a hall effect and reed switch today... I'm surprised that a reed switch can be closed by the field from a small electromagnet but the bench does not lie...    this looks really really interesting, and much easier (and cheaper) than to play with than programming microcontroller interrupts for Boyce's stuff...

Thanks guys

@bolt ,all

That 160W overunity device you mentioned , the one created by magnacoaster, do you have any comments on details on how the schematic might be organized?  I am very interesting in trying to get coil shorting to work in closed-loop mode...