Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated

[listener192]

Thanks
Here is another video demo focused on the coil return (collapsing field & collecting diodes) which many have been wondering how much power is actually returned from the coils discharges.
I can confirm at the low frequency Pierre was working at, it looks to be less then 10%. So if the diodes return is a big part of the effect we are not getting much from our low inductance 35 turns coils at low frequencies. However, the higher the frequency the more efficient and around 400Hz the scopes (in vs out) current probes measure the coil return to be about 80% of the input power but the output is much less.

Link to video: https://youtu.be/IaWbGIsAT14

Hi Gotoluc,

My setup  is almost identical to yours except for more rotor coil turns. No cap on output.
The cap bank is being charged from the power supply and the half bridges are supplied by and recover to the cap bank. 

I show virtually no recovery current at any frequency and nor would I expect to, as no coil never really turns off.

At higher frequency, DC input current decreases and output voltage/current also decreases.
This is when running continuous overlap with no off period.   

L192

[d3x0r]

while we're asking about wires; whats THIS wire?
Video 1

[listener192]

Hi Gotoluc,
See attached test running at 20Hz.

With no coils off, there is no actual recovery current i.e. the waveform stays above the yellow side marker (zero amps).
With all coils off at end of sequence note the current recovery as the spike goes below the zero amps marker.
Unless all the coils turn off in sequence there is not much overall recovery.
I am not sure how you got your result?
Regards
L192

[listener192]

while we're asking about wires; whats THIS wire?
Video 1

A good question however, the one I pointed out appears to be connected to the AC input to the FWBR, whereas the other mystery wire  is not clear at all.

L192

[jerdee]

En:
Pierre,

You have mentioned current variation and intensity is needed across the coils.  Now that I am  beginning to understand coil groupings, the groupings allow more effeciency and less crossing of the fields.  They also allow OFF's to have coil return.  Again, this is ONLY a rotating magnetic field, nothing more.

I'm now thinking harder about "current variation".    I'm left thinking about combining multiple groupings of poles at specific times during rotation to increase inductance?  I'm still learning, but combining multiple groups of same poles together in a very specific way while in rotation allow for a variation in inductance.  It has to be at the right time to work, time it.  But this variation during rotation creates a pumping of inductance as the field rotates. 
Hope I am making sense and you are doing well.
Jerdee

Fr.
Pierre,


Vous avez mentionné la variation de courant et l'intensité est nécessaire à travers les bobines. Maintenant que je commence à comprendre les regroupements de bobines, les regroupements permettent plus d'efficacité et moins de franchissement des champs. Ils permettent également à OFF d'avoir le retour de la bobine. Encore une fois, ce n'est qu'un champ magnétique tournant, rien de plus.

Je pense maintenant plus à propos de la "variation actuelle". Je pense à combiner plusieurs groupes de pôles à des moments précis pendant la rotation pour augmenter l'inductance? Je suis encore en train d'apprendre, mais combiner plusieurs groupes de mêmes pôles de manière très spécifique en rotation permet une variation d'inductance. Il doit être au bon moment pour travailler, le temps. Mais cette variation pendant la rotation crée un pompage de l'inductance lorsque le champ tourne.

J'espère que j'ai du sens et que vous allez bien.
Jerdee