Muller Dynamo

[plengo]

Yikes!  The digicam is off with the Mrs. on her trip out West.  Won't be back until Sunday.  But you still wouldn't be able to see much:  My rotor is 1/2 in. thick plywood and the magnets are only 1/4 in. thick.  They sit in equally deep pockets drilled with a Forstner bit.  But they are not centered in the rotor.  They are actually a bit lower than center.

I'm not near the contraption now, but if I had to guess, I would say my ferrite is around 4mm distance to the rotor mags.  The ferrite protrudes ~2mm out of the rotor facing side of the coils (Singer type 15 bobbins).  The ferrite is 1 inch long and sticks out the back side of the coils about 13mm.

The backing mags are separated from the ferrites with pieces of 1/2 in. plywood again.

M.

4 mm does make sense to me in your numbers. I am getting better and better with closer to the rotor magnets. Once I mentioned that closer was not better and I am surprised that NOW I am getting better numbers with smaller gaps to the rotor magnets. I think the biasing magnets and the speed (RPM) of the rotor makes a huge difference.

I see a sine wave pattern in your measured RPM and out power and it is starting to make me think of something none ever thought about really. Magnetic waves. There is a good research about it with T.T. Brown.

Fausto.

[mondrasek]

Fuasto, if you don't mind me asking, in what part of the world do you live?  I just realized that your postings do not appear to follow my own normal awake hours.

Australia?

[mondrasek]

FYI, I just checked the gap between my coil ferrite cores and the rotor mags (remember that the mags are embedded in the rotor, so just an approximation).  I would have to say that they are definitely in the 4mm gap range, if not a bit smaller.

I cannot measure this accurately, but several decades of experience has seemed to prove my ability to approximate distances to a fairly high accuracy using only my eyes.

M.

[Cap-Z-ro]

Quote from X:

" Remember Romero suddenly abandoned his coil-shorting set-up with a single generator coil and concentrated on building the bigger Muller.
He found something already in the smaller set-up.
I am not so sure that we have totally understood yet, what that really was.
Just my 2 cents."


Could it be that he has that single coil tapped at specific intervals, and is shorting various sections, at a tuned rate of time ?

Regards...

[itsu]

Hi Mo,

its hard to keep track on your postings about the severall items :-)

As i understand you, you have 2 pickup coil pairs, both in serial bucking config, right?
Without (bias magnet) tuning, you have NO (or very little) voltage/current (and drag), right?
Then you tune each coil pair for max. voltage you say, by putting up the bias magnets, right?

As i understand this, what you are doing with the bias magnets is to de-tune the bucking config, so
that it supplies voltage/current again (and drag), which is the same as trying to go back to serial adding config.

Correct me if i am wrong, but i don't think this will be leading you to anything other then learning stuff which is good.

Concerning the RF (1300Khz), it could be that one or more of your coils is oscillating.
Try to measure the inductance of your coils, and use one of the online RLC calculators to calculate the
(self)resonance frequency of your coils.

Further, follow common sense to determine where this RF is coming from.

Almost any scope is capable to measure (see) 1300Khz.
Start by looking at your local environment, are there any RF noise sources around (accesspoints, Mobile phones, laptops with wifi)
Shut down anything not directly needed for your rotor.
If possible, use a battery to run it instead of a (defective?) PS.
Remove or permanently short your pickup coils, does it still shows the RF?
If so, it can come from your drive motor / circuit, use your scope to see where it comes from.
Use decoupling capacitors (ceramic 100pF) to "ground" any voltage lines.
If it comes from your pickup coils, you should be able to see it with your scope.

This way you should be able to pinpoint your RF source.   
   
Good luck,  regards Itsu