The Ossie motor

[captainpecan]

I think I've got this figured out pretty well.  At least it is starting to make sense.  What we appear to be seeing is the bemf caused from the pulse and the inductive wave butting against each other is trimming the peak off of the trace.  That trimming of the peak we see in the trace, appears to be showing up in the other trace shot.  It's disappearing from one, and reappearing in the other.  This could be a little nugget of info we need to determine if we are capturing any extra energy from the BEMF.  I see the same thing in woopy's new traces he just posted.  The peak that disappears from one, shows up in the middle of the other.  This at least indicates that the peak of the pulse that disappears, does not leave the circuit, it just get's redirected.  Now, this also could be showing up this way because of how the probes are hooked to the circuit.  I'm thinking Ossie and JLNaudin had the probes hooked to a slightly different place in the circuit.  This trace could possibly look identical to theirs if probes were hooked different.
Woopy, could you please double check where your probes are hooked up, and let us know exactly where in the circuit they are for sure.  Then we can try and compare with what we are seeing in JLNaudins and Ossies to see if we are indeed seeing something different, or just seeing the same thing in a different way.

Take a look, and let me know what you think.

[woopy]

Hi Captain

I hooked the probes as Futuristic proposed some post ago,

1-  Canal 1  with  main probe between battery plus and 1 ohm resistor secondary probe (clip) right after the resistor . So to measure the current image.

2-  Canal 2  with main probe  on the ground  (minus ) of the coil and secondary probe (clip) on the coil plus (positive)  . Which give an inverted picture of the voltage. This  is due to the fact that my scope as the same ground on both canal so i can not plug two minus probe together because shortcuting (thanks Frenky ).



But now something very interesting for the nihgt


I tried to slide out one coil . I mean the coil was always connected to the circuit in serie  but simply no more activ (no more between the magnet sandwitch).

And i espected thad the motor would slow down  1/4 because a lack of this power coil .

Nope     the motor speed up , the torque seems to go up an the current goes up to.

Than i slided away a second  and opposite coil  and again the current goes up as the Rpm and torque

Than i slided away the third coil and the current goes up and the rpm up slightly.

Than i disconnected 2 coil from the circuit and i got a very good torque for a good current   

will try to document this better this weekend


Ossies motor surprise

Good night at all

Laurent

[captainpecan]

@ woopy,
Thinking about your results, and looking over your circuit again, makes me wonder a couple things.  There does not appear to be any recovery going on here.  The coils are only hooked up to the circuit when the mosfet is turned on.  Then when it is turned off, the field is pretty much forced to collapse into the surrounding air instead of redirecting to the battery or anything.  Is there some reasoning behind wanting to do it this way?  As far as I can tell from your circuit, I see no generative effect at all there.  The coils are not even hooked to the circuit because of the open mosfet the entire time, except for the brief time you are pulsing it.  It's kind of like you are running a pulse motor with the same theories of a conventional motor.  I am not sure what you are looking to do here, are you simply after the most possible torque?  If so there are some things that could be tried to do that, including adding a small cap across the coils and try to tune it to resonate.  If that is not what you are wanting to do, then maybe it's time to start adding some kind of recovery circuit and pull that lagging magnetic field out of those coils when you don't need it hanging around and poke into some batteries or something. It really does help a motor run much smoother when you recover it.  I'm not trying to be negative, just calling it as I see it.  Maybe it's just a test circuit, and you plan on adding the recovery anyway, and you just haven't got that fare.  I just wanted to throw my thoughts out there, maybe something will help.

As far as it speeding up when you remove coils, it makes sense with your setup.  As I see it, your BEMF that is limiting your current flow is cutting down more and more with each coil removed.  Simply cutting down the BEMF by 25% by removing one coil, will allow more current to flow.  More current flowing will drive the motor harder and show more torque.  You must remember, you are now sending more current into that motor.  You SHOULD be getting higher rpms and more torque.  What your looking for is efficiency I believe.  Having the extra coils gets you slightly more torque and speed for LESS current draw.  It just depends on what you want your motor doing.  Be more efficient, or run at break neck speeds and high torque!  A good combination of both would be ideal.  At least that is my theory right now.

Also, from looking so closely at your scope shots.  It almost looks like your actually feeding energy backwards through that mosfet, and INTO your trigger circuit.  That's just wierd... 

[woopy]

Hi Captain

Of course i am trying to get something back from the coils. But not so easy. And of course if i can maitain the torque high it is better.  So many things is new for me in this concept, that i try every thing. Some time confusing sorry.

The last one is the bridge rectifier between the coils, and i added a diode between the minus of the coil and the bridge. See shematic

And the result is very interesting as i can get very strong and large positive flyback spikes. see pix. This way i could charge my big cap at the plus and minus of the bridge much better than without the extra diode.

Will test more tomorrow.

Please your comments

regards

laurent

[futuristic]

I've been working hard though the day and results are here.

Video will come tomorrow because it's currently uploading to YT and I'm going to bed (almost 1AM here).
I will also do scope shots tomorrow...

So here is gallery