Muller Dynamo

[mondrasek]

The big question is how to get that voltage out of 2 tiny coils?
Even with coils 3 times bigger than Romero's i can't reach such voltage.
So there is a process going on that significantly boosts the voltage.
If it's not resonance, then it has to be something else.

Did someone actually try Tesla-style series bifilar generator coils with this?
This might increase the voltage in such a fashion.
(Thread gets too long, not sure if someone did)

I was able to get greater than 16 V out of my coil pairs when they were adjusted as close to the rotor as possible, but only after adding the backing magnets (not touching the ferrite cores!).  Please keep in mind that my rotor is 1/2 inch thick and the magnets are in pockets ~3/8 deep.  The rotor magnets are only 1/4 inch thick and they are a bit below center (I shouldn't have trusted my drill press depth guide).  So I can only bring coils close to the rotor until the top ones begin to hit the rotor.  The bottom ones will still have 1/16 or so inch clearance if properly balanced output wise to the tops.

I have run Tesla bi-fi and single-fi for comparison.  I found no difference when used as output coils.  But I may have seen that bi-fi coils use the backing magnet induced voltage increase to a better effect.  But that is subjective now.  The tests were never apples to apples.

On a side note, now that I am testing with a much lower power o/p (coils much further away from the rotor), I have not yet experienced a voltage increase when adjusting the backing magnets.  So they are not even in place.  Maybe they are only important once the rotor/coil/ferrite cores are in closer proximity?

M.

[xenomorphlabs]

@mondrasek: Do you have a picture of your set-up somewhere in this thread?
You still using "~200 wraps of 24 AWG" as in Reply #4102 ?
Good news that you get 16 V DC out of them ! You measured right across the DC side of the rectifier?
Just looked at an image of Romero's Rotor and his pickup-coil to magnet air gap seems to be 5mm.

[chalamadad]

I was able to get greater than 16 V out of my coil pairs

What was your input power and rotor speed?

[powercat]

New video from Lidmotor
Muller Dynamo running on homemade battery.ASF
http://www.youtube.com/watch?v=1C60jdl_NVU

[mondrasek]

has anyone got a big advantage from the magents behind genrator coils yet???
I got it to work with motor coils in it has 1/2 draw but nothign with the gernator coils yet.

Yes, I saw a huge voltage increase earlier.  I also noticed a small rotor RPM decrease while doing so.

When I saw the voltage increase the coil core ferrites were about as close to the rotor as I could move them without crashing.  At that time I saw an increase of approximately .9V by adding the backing magnets to one coil only.  An identical increase occurred when I placed a backing magnet on the opposite side coil of the pair.

My experience with the backing magnets is that they had to be placed with precision at a specific height above the ferrite (mine sticks out about 1x the thickness of my coils).  When moving the backing magnets into place by hand I could initially feel repulsion from the rotor magnets.  When the backing magnet was moved too close to the ferrite it would then begin to be attracted to the ferrite more than being repulsed by the rotor magnets.  But it was apparently exactly at the balance between the rotor magnet repulsion and attraction to the ferrite that I found the greatest voltage increase.

Again, the backing magnet voltage increase phenom also resulted in a slight drop in RPM.

In my recent testing I have moved the coils much further away from the rotor.  In the earlier tests I could achieve nearly 17V on the DC side with the backing magnets.  But now I am only at ~6 to 7V.  At this separation distance I have seen NO increase in V from backing magnets.

Also, placing backing magnets directly against the ferrite caused a huge loss in voltage.

M.