Muller Dynamo

[e2matrix]

First run of my replica 

http://youtu.be/rKayqJDs4b8

scratchrobot

Looking good there other than the slight wobble in the rotor.  Couple questions - Is that some type of Acrylic or plastic you are using?  You don't have magnets yet on the other side of the coils?  Are your driver circuits basically same as Romero's?   Wish I was that far along - best of luck with it!

[scratchrobot]

Looking good there other than the slight wobble in the rotor.  Couple questions - Is that some type of Acrylic or plastic you are using?  You don't have magnets yet on the other side of the coils?  Are your driver circuits basically same as Romero's?   Wish I was that far along - best of luck with it!

Thank you, yes having a hard time with the rotor 
No magnets yet, also missing ferrite in generator coils. I used mdf board to build and painted it.
I think it's better to build it with acrylic or plastic, this was not a good choice.
For driver i used mjl21194 and bd140 transistor from other project so it is not the same.

[toranarod]

for those of you who are looking for easy electronics
get more dedicated hall sensors
see photo

[gyulasun]

Hi Laurent,

1)  I guess you use the DC motor as a load to see and hear output power change...   still I would use a 15-22 Ohm  1-2 Watt normal resistor and a LED with a series 2-5KOhm resistor to see its brightness indicating change in output power. (the LED with its series resistor is connected across the load resistor,  i.e. in parallel with the puffer cap)
2) What is your puffer capacitor value now? 4700 or 47000uF?  From your third scope shot  (7 coil unloaded after FWBR.jpg) when you mean no load at the DC output i.e. no load across the output capacitor, you should have a clean DC voltage (flat line in the trace) but you have a 'mixed' waveform of even 7V peaks riding on the DC level,  why is this?  Try to disconnect all the gen coils except any one of them and check for the output while you add one by one the gen coils.
3) your diodes sound good by their type, earlier you wrote they are Schottky but they are NOT Schottky and I believe they should be good for this job...  though Romero listed also a fast recovery type he found not good.
4) on your scope shot  in i-coil-after-bridge-1.jpg again suggest you do not use output puffer capacitor? IF you see such waveform acros a diode bridge DC output, you do not have puffer cap or if have then something is wrong with say the diodes bridge connections or the capacitor...

Must finish, just take it easy and double check everything.

Gyula

[toranarod]

Thank you for that link wings. seems to fit neatly with rotor speed being critical as well as coil specs.

good link

this is a photo of my motor drive coil from the scope you can see the time constant

http://www.tpub.com/neets/book2/2d.htm

http://www.youtube.com/watch?v=UpO6t00bPb8

this is why we need to look at the coil energy to go beyond the 63% is a wast of energy I switch of my coils just after the 70% drive and re switch.
the load is return back to the source and in turn provides magnetic force to increase the drive.