Muller Dynamo

[gyulasun]

Hi Joe,

I think you have done an excellent test and although you have not reached extra output over the input the results are good for a single drive coil. NOTICE: I did not consider the mechanical energy of the rotor, only the recovered electrical energy and the bulb does not fully discharge the capacitor.
You let the 330uF cap charge up under about 125ms to 43.6V and the 24V bulb discharges it in about 75ms to 28.4V if I can see it correctly.  So if I am not mistaken,  you charge and discharge the cap 5 times per second (125+75=200ms,  1/200ms=5Hz) so the bulb takes out about  0.18*5=0.9W power in any second.  I hope I am correct with the calcs, see Doug's example on such calcs here: http://www.overunity.com/3842/muller-dynamo/msg306002/#msg306002 

Keep up the good work.

Gyula

Hi all


Here is my new video after long time where I am testing the No Hall Pulse Motor Mosfet driver and BEMF CAP Charge and Discharge to load ( light bulb ) circuit Arduino controlled.
I am using the principle which Kone is saying is good to capture and use BEMF from drive coils:
Charge CAP from BEMF -> Disconnect CAP from drive coil -> Dump stored energy from CAP to load -> Disconnect CAP from load and repeat the cycle.
In my test the motor RPM drops a little but I have to find a sweet spot and the right CAP size to speed up the rotor while using the BEMF.


OK here is the video:
http://www.youtube.com/watch?v=a75Gf7yrCCA


JoeFR

[joefr]

Hi Gyula Thanks for calculation


I get the same results so you made correct calculation. I will try different CAP size and different voltages tomorrow to see if I can get better output.


JoeFR

[crazycut06]

Hi Gyula,


If you mean you would build one from components then the first thing to define is the input voltage range and output current needs.  Then comes the component costs and you may end up with similar prices like ebay offers... lol  though postage cost may make the ebay choice more expensive than building from components.  So I suggest to define your specs and we may find a schematic and the needed components. Gyula


Yes that's what i mean, anyway my rig is dismantled right now, im still working on my rotor, lot's of wobbling, and also i'm going to wind some new coils, after that i'll see what my generator output is, will be posting soon....


@ Deepcut


Thank's for the suggestion, I live in a poor man's land so i can't afford and don't have the capability to buy online...
im just trying to use what is available here.




Thank's Guys!   regards Cc

[mariuscivic]

Hi guys
Earlier i said that i looped bemf back into the battery.Obviosly i didn't connected right couse now when i try  to loop again it gives me lots of sparks on the both wires( just like shorting). The negative wire from DC/DC conv. i managed to connect it to the battery negative by puting one diode. But it doesn't work with the positive one.
Anyway, i built 5 romero driving circuits (need to do 3 more) and i colect the bemf from all 5. The 22000uF/35V cap is filling up in 5-6 seconds and all this with less curent consumed  and a gain in rpm

[gyulasun]

Hi guys
Earlier i said that i looped bemf back into the battery.Obviosly i didn't connected right couse now when i try  to loop again it gives me lots of sparks on the both wires( just like shorting). The negative wire from DC/DC conv. i managed to connect it to the battery negative by puting one diode. But it doesn't work with the positive one.
Anyway, i built 5 romero driving circuits (need to do 3 more) and i colect the bemf from all 5. The 22000uF/35V cap is filling up in 5-6 seconds and all this with less curent consumed  and a gain in rpm

Hi Marius,

I would suggest to wind a 1:1 transformer onto ferrite pot core, hopefully you can obtain pot cores with a diameter of at least 23-25mm in your country, see here what I mean:
http://www.surplussales.com/inductors/FerPotC/FerPotC-1.html 
The higher the so-called AL value for the pot core, the better for you because the less number of turns is needed:  L=N^2*AL  so if you have AL=4700  (this is in nH/N^2), then for say N=50 turns, L=50^2*4700=2500*4700nH=11.75mH 
If you could make 5 such 1:1 pot cored transformers then relatively cheaply you could solve the correct 'chain-connection' of the 5 stages, I edited your earlier schematic to show for two such stages how I mean.  Principle: By connecting one of the coils of the 1:1 transformer in parallel with the driving coil, the back emf spike would be transformed to the the other, galvanically isolated coil of the transformer.   To make such transformer, you could wind two wires guided close to each other as if you were making a bifilar coil onto the bobbin.  It is important that the transformer coil which is connected in parallel with the driving coil, should have 8 to 10 times as high L inductance than the driving coil has.  So if your driving coil has 1-2mH inductance, your transformer coil should have 15-20mH, this is why high AL value pot cores are needed. 
(Notice: perhaps the use of diode bridges instead of the single diode rectifiers at the output of the 1:1 transformers could be better?)

What do you think of this pot core suggestion?

Gyula