A little update on my motor so far.  I have the dual pulse setup made and running now.  I've been banging my head against the wall tuning it, but I've finally got it running really well.  Only problem is that it's not as efficient as when I run it on one pulse per magnet pass.  Using 4 reeds is not easy to tune at all, and is next to impossible to pulse it correctly without causing a short circuit.  In other words, when the magnet is at TDC of the coil, it is trying to engage one reed from the first set, and one reed from the second set causing a direct short.  When the reeds are moved far enough apart to make sure there is no short circuit, then the pulse is not timed proper anymore.  Long story short, I'm working on biasing the reeds with a small permanent magnet to tune the pulses better.  Also I am working on different layouts for the reeds, to help avoid this tuning problem.  Including some idea's that were shared here earlier.

Overall, so far the double pulse setup does run much faster rpm, but it also loses more energy faster due to the slightly off time pulsing I have to be using to avoid a short circuit situation.  Good and bad results.  I'll share more when I get it running better.  Interesting enough, if I disconnect the bridge, the battery begins to charge up, without any recovery circuit connected.  Still weird, but of course murder on the reeds.

Okay, a little quick fun with photoshop and I think this is what is going on with that trace for sure.  It is generating a higher AC voltage than the DC pulse, but just barely.  It is the BEMF of the drive pulse itself that forces the voltage lower so we do not see the "bump" we would expect.  You can also see the small spike on switch opening.  That little spike seems to be close to the same voltage as the regular induced voltage if there was no BEMF at that moment of switch open.

A second thought from a bit deeper study.  When looking at how the coils were wound for this trace, leads me to believe the peak of the wave is more narrow than what JLNaudin and Ossie show because the inside core is wider, and the outside diameter of the coil turns is smaller than what Ossie and JLNaudin used.  Not that either is better or worse, just sharing what I am seeing by picking this trace apart.  In order to hide the pulse completely inside this AC wave it would require a fairly small pulse width.  This of course decreases RPM possibly to much.  Coil diameter may be factor to pay more close attention to, and not just inductance or number of turns.  A wider AC wave peak may be more beneficial for efficiency and higher rpms... At least that's what I see.

@ Futuristic and Cp and Gyula

thanks for replying my boring question


1- the scope trace (see pix) is perfectly centered and    if it would be no pulse     the AC trace would be + 5.2 volt and - 5.2 volts . as Cp showed in is post 

so  if i understand well, the red impulse rectangle " eat " the positive  green generation curve and supress the small blue bump which desappears this is  due to a CEMF ?


2- now what shows the negative purple curve which is not affected by the red pulse.

for info i have inserted my shottky bridge across the coil and i get the inversion of the negative AC trace, which become positive. But if i try to charge my supercap directly from the bridge the Rpm first fall down and than as the cap charges they go up again.  Same thing with the current which first goes up and than down.
 
Now the super cap charges quite fast at the beginning and than slower and slower  Now after 3 hours the super cap is at    4.37 volts    still climbing and the battery is down at 4.25 volts (it was 4.29 at the beginning).
The Rpm was at 175 at the beginning, went down to 162 when i connected the supercap and are now back to 172 seems at max with thge battery at 4.25 volt  .

Now the question     is my motor using the juice of the battery and go down and down      and in counterpart the supercap pumps the energy of this negative Ac curve wich stay undisturbed by the pulse as is positive sister ? And as this negative curve is slightly higher in negative volts (5.2 volts at the beginning and now on my scope is  at 4.96 volts) Does it show trhat the supercap will charge up to probably more than 4.5volts (depending of diodes and circuit resistance) while the battery will go down more ?   How can we put the supercap backstored energy in the battery   ?  Any idea ?



3- As the motor is an attraction motor, we aggree that the impulse current  is independant of the magnet strength .correct?

If yes the bigger the magnet , the stronger the torque for the same impulse current? correct ?

So would it be a good idea to place a second magnet on the other side of the coil   so double torque for the same current ? correct?



4- where and what is the best position of the magnet to the coil.  Must the magnet be round to fit the round aire core ?  Can it be a rectangular magnet with the aircore width but longer, covering the whole height of the coil ?

any idea ?


And it is all for this post

thanks to all

Laurent

4- where and what is the best position of the magnet to the coil.  Must the magnet be round to fit the round aire core ?  Can it be a rectangular magnet with the aircore width but longer, covering the whole height of the coil ?

any idea ?

This could be tested in Femm (magnetic field simulation software), but I haven't been using it for quite some years so I am probably not the right person to do it.
But my opinion is the bigger and the stronger magnets will show the best results.

Frenky

Great thinking.
This would for really improve performance.

Because of how magnetic fields work, the bottom design will work better - magnetic fields want to 'line up' and in the top design, they are lined up the entire time, whereas in the bottom design, they are not in-line until you hit the center. I've tried both styles in other testing and noticed a significant difference.  It's also easier to secure them against getting too close and touching, resulting in additional resistance.

...
2- now what shows the negative purple curve which is not affected by the red pulse. 

The neg. purple curve is the negative half wave part of the induced voltage during one full turn of the rotor.  Here is a good Java animation for seeing a conventional generator principle, the same happens in your present setup too:
http://www.walter-fendt.de/ph14e/generator_e.htm
Note the voltage waveform has a zero crossing just like you have, this happens any time when your rotor magnets are just between two adjacent coils. 
And if you choose the 'With commutator' position in the Java applet, then you just connected your full wave diode bridge to the coil outputs, and you get the negative half waves already turned upside and embedded between the positive ones. This is what full wave rectification like.

But if i try to charge my supercap directly from the bridge the Rpm first fall down and than as the cap charges they go up again.  Same thing with the current which first goes up and than down.

This is natural and shows Lenz law: the capacitor draws current while charging up, and current is taken from the induced voltage and this process exponentially goes on as the cap charges up: first the capacitor is empty, hence the charging current (which is the load current for the coils' induced voltage) is at its maximum, then current reduces as the stored voltage across the capacitor increases. Had you had a resistor load say a 10 Ohm) across the bridge output, your rpm would have reduced to a steady lower value and would have remained there.
 

Now the question     is my motor using the juice of the battery and go down and down 

I am afraid yes but I have not built such setup and cannot confirm this, please read and study Ossie's letter, it says the voltage in the battery can be kept at the same level IF you make the switches ON and OFF times correctly,  the letter is quoted on Naudin site,

http://jnaudin.free.fr/ossiemotor/indexen.htm#comments

    and in counterpart the supercap pumps the energy of this negative Ac curve wich stay undisturbed by the pulse as is positive sister ?

No I do not think the voltage in the cap has "pumping connection" to the negative AC curve you refer to in your scope shot as you meant. In fact, that negative waveform is also used for charging the cap just like the positive waveform, the diode bridge changes the negative half to be also a positive one-- the bridge does its job, a full wave rectifier.

  How can we put the supercap backstored energy in the battery   ?  Any idea ?   

Normally by using a dedicated DC/DC converter but it can only be 95-96% efficient in selected cases so you would have to have at least a COP of 1.04 - 1.05 coming from your motor setup to compensate for the converter 'underuntity' , to get a real selfrunner.  Others opinion are welcome here!
(On a real selfrunner I mean a device that has a COP>1 and part of its output energy can be used for solving its own energy supply.)

3- As the motor is an attraction motor, we agree that the impulse current  is independant of the magnet strength .correct?

If yes the bigger the magnet , the stronger the torque for the same impulse current? correct ? 

 

Yes for both, though it could be a repel motor too. 
I would vote for making such a motor with as many small coils in series and very strong magnets as possible to place on a rotor of a chosen size. Many magnets mean much more flux interacting, giving more torque.

So would it be a good idea to place a second magnet on the other side of the coil   so double torque for the same current ? correct? 

Frenky answered this and I agree with him, though I have not tried this on an air core coil. It surely works on an ferromagnetic cored coil. If it cannot be made to work, then the lack of a ferromagnetic core is the answer.

4- where and what is the best position of the magnet to the coil.  Must the magnet be round to fit the round aire core ?  Can it be a rectangular magnet with the aircore width but longer, covering the whole height of the coil ?   any idea ?   

Ossie explained where it is the best, read his letter referred to above
 and see this scope shot

http://jnaudin.free.fr/ossiemotor/images/ossie2.jpg 

This means that it is better to use two switches, not only one. With the first switch you can choose the precise ON and with the second one the OFF time, Ossie says he positions the first reed horizontally and the second one vertically, you may wish to copy this with your second Hall sensor and circuit?  Or your using only one switch, positioning it also radially (not only sideways) from the rotor magnets, this may not give an optimum switch on-off timing, it sounds better using two independent things for fulfilling two independent tasks.

rgds, Gyula