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Author Topic: Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated  (Read 43448 times)

Offline seaad

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Hi Luc, in my understanding of this device, you need first magnetize the core and after them sustain this with much little requeriments of energy, for that reason the field can't be detroyed, because if you destroy the field destroy the core magnetization, in Pierre video when he connect power supply to the arduino, begin first one initial sequence (i suppose that is for the core magnetization) and after that the working sequence well knowed.
GM

" in Pierre video when he connect power supply to the arduino, begin first one initial sequence (i suppose that is for the core magnetization) and after that the working sequence well knowed.
"
I can confirm that. It's easy to see in slow mo.
Has that something to do with all Pierres diodes going to plus?

It is strange that Pierres digital voltmeter COMES ON and lits  BEFORE the main 5 Hz Arduino sequence starts ???
3:rd film 10.0 min.

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Offline stargate22

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" in Pierre video when he connect power supply to the arduino, begin first one initial sequence (i suppose that is for the core magnetization) and after that the working sequence well knowed.
"
I can confirm that. It's easy to see in slow mo.
Has that something to do with all Pierres diodes going to plus?

It is strange that Pierres digital voltmeter COMES ON and lits  BEFORE the main 5 Hz Arduino sequence starts ???
3:rd film 10.0 min.

I believe he is talking about this....I thought the same ?

Online r2fpl

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72 diodes connected Only to + and somewhere ?   (72 relays, 36 coils)

And middle connections without labels  35 empty 36 = one single point between two coils and two relays with TWO diodes in parallel ??
How are the diodes connected on the Arduino compared with Pierres connections?

35                    36
coil       relay    2xdiodes
orange|blue|black,green

Offline Andy71

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Hello
Try it.
Which type of diode does Pierre use?
Are sb 580 schottky diode sufficient?
80V, 5A

Offline forest

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Andy71


Thanks.Very valuable circuit.I wonder if we can make smaller scale model this way. How to eliminate trigger coil and turn both MPS transistors from Arduino at the same moment  ? Can you post such modified version too ?

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Offline jerdee

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The easiest way to vary the current through all of the coils is with PWM.

We are generating a travelling wave via the rotating poles lets say at 10Hz, then via PWM we superimpose 60Hz on top of the 10Hz wave?



L192


  I believe you are on the right track! Look at Peirre's scope shot, you clearly see the variations of pulse width.  Pierre has 24 lines of code, while PMGR(LUC's code) has 20 lines of code.  BTW, the bug discussed earlier in the code, does not make a huge enough difference in the current variation.   You have three ways to approach variation.  1.  Time, 2. Amplitude, 3. Frequency.  Just like sound has three principle elements.


If we divide the code into 4 quarters, you can think of each quarter as a typical quarter wave!  Set each quarter of the code with alternating delay values.  The total freq can remain the same, in Luc's code, 20 total lines = 1 cycle or one FULL WAVE.  We already know that varying the freq. of the loop with delays varies the current draw.    Why not purposely set alternating groups of delays to simulate variation of current!!  Does this make sense?


Other thoughts,
1. Do the variation of delay values on the half wave.  Not sure this will work, but worth a try. 
2. Vary the offsets (instead of 5,5,5,5  make it 1,5,5,5,4)
3. Alternating on the the full-wave!

I don't believe variations of delay between the HIGH's and LOW's will make a difference! You don't establish WAVE, you just establish overlap control of the windings.  So you can't think of delay variation based on the switch, you have to think of it as a variation on the wave, in quarters, half, fullwave. 

Cheers,

JerDee

Offline seaad

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We already know that varying the freq. of the loop with delays varies the current draw.    Why not purposely set alternating groups of delays to simulate variation of current!!  Does this make sense?
JerDee

 A simple test: Set the Arduino to 50Hz and via a cap modulate the pot-input from a  signal-generator (sinus, square? etc.) with a lower freq.
/ Arne

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Offline jerdee

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A simple test: Set the Arduino to 50Hz and via a cap modulate the pot-input from a  signal-generator (sinus, square? etc.) with a lower freq.
/ Arne


Yes, I believe this has to be synced to a harmonic of the FULLWAVE of the code.  I may be wrong on this. 


Also, along your thoughts, the original code had a ADC value mapped to the delay value.  So yes, a sine, square..etc.. to the ADC is a possibility.   If you look at this approach,  Pierre could have used a SQUARE wave to alternate the delay values.  I see alternation of two sets on his scope shot!


JerDee

Offline gotoluc

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Offline Slider2732

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A very interesting video Luc.
Am glad the Propeller has sorted things, perhaps also because your friend nearby can actually look at any problems to fix them and likely could do so far quicker than shooting videos etc for help here.
If it works it works :)

So...you pull coil 30 and things improve. Do you think that there is a secondly function of the microcontroller code ?
To create an imbalance and, for want of better words, the natural entropy is what manifests as an OU situation for those split microseconds of every time it changes ? That section would tie into the PWM thoughts and apologies to all if i'm slow on that one !
Or, perhaps, remove 30, 24, 18, 12, 6 and see what happens.

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Offline listener192

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For comparison

Actually your waveform is not too bad Gotoluc!

Added the adjacent poles.

L192

Offline gotoluc

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New results using a Variation program written by jerdee: https://youtu.be/bLJsMcGm6AQ


The below pictures are Pierre's Stator windings then My Stator windings (related to video)
« Last Edit: April 17, 2018, 12:51:44 AM by gotoluc »

Offline gotoluc

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Scope shot of current with H30 Connected and then without H30 connected using the Variation program by jerdee demonstrated in above video.

Offline listener192

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New results using a Variation program written by jerdee: https://youtu.be/bLJsMcGm6AQ


The below pictures are Pierre's Stator windings then My Stator windings (related to video)


I think it is still a 6 slot pitch.

L192


Offline listener192

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New results using a Variation program written by jerdee: https://youtu.be/bLJsMcGm6AQ


The below pictures are Pierre's Stator windings then My Stator windings (related to video)


Take a look at my stator from another angle. See how the top winding twists.

If these were wound tighter they would look very much like Pierre's.

L192
« Last Edit: April 17, 2018, 09:55:34 AM by listener192 »

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