Muller Dynamo

[hoptoad]

E2, this is not the coils used in the 'build' but a couple of test coils, the ferrite one from way back, the somaloy one fresh made.

Like everybody i thought the magnet on the end of the core was the be all to end all. But I suspect that the magnet is just compensating for the inefficiencies of ferrite.

The big ferrite coil is 28 X36 mm. It is using the "core should extend out the back" principle.

http://www.totallyamped.net/adams/index.html

Around page 4 or 5

I get 1 watt from this coil. With a stack equal to the rotor stack length the output goes up to 1.8 watts...nearly double, right?

But have a look at the new somaloy coil...it is machined from a piece of 1 1/2 PVC. The coil is only 12 mm wide, 240 turns, the part under the red tape. With the same gap, rotor, RPM, I get 4.68 watts. With one 1/8 thick magnet I get 5 watts.  The effect seems to go away with better cores.

Ron

Great observations and feedback Ron.

Out of curiosity, have you tried a heel end core using the somaloy as core material?
Just wondering if the same effect of increasing output applies, or whether the heel end only improves the output when the core material used is not as efficient as the somaloy.

Cheers, keep up the good work.

KneeDeep

[konehead]

HEY RON

did you get those somally cores from Phil Wood a few years ago?
He sent me a couple dozen and am thinking of trying them out later on -I have some neo magnets that slip right into the insides of them too...

Dont pass over what a "regauging" magnet will do to GENERATOR COILS (and drive coils too)
I really think this is the key to Romero's success  - he got those magnets to cancel out the evil lenz-lug pullback in all his generator coils by finding the right balance. People do it with motor/drive coils (like in Bedini patent he ahs slinding magnet in back of motor-coil core) but Romero is first person I have heard of to do the regauging-magnet trick to generator coils induced by neomagnets and look what happened.

[konehead]

Nvisser wrote;

"Is it not so that the sine wave peaks of a generator coil appears just before and after TDC and that the sine wave cross through the 0V line at TDC.  So the way I see it it must be shorted at that peaks and not at TDC"

Kone reply:
yes with AIRCORES, you will get sort of double-sinewave peaks, with leading edge of magnet then trailing edge of magnet making their repspecive peaks and the exact middle of the manget actually is like the eye of hurricane - hwoever with N-S magnets going past, you can experiment with coil size and widths and rpms and you can get the sinewave to be flat throughout peak (square wave) and then shorting during that entire period in clusters of pulses is something to do - similar to Ismael's trick of 5 times at peak coil shorting.
with ferrous-cores in coils however, then you will usually get a nice looking sinewave pretty easy with N-S magnets going past, just because the core is doing its thing to the coils via the magnets, while in aircores the magnets are "doing it" directly to the coils

[nul-points]

LOL, now you tell me... I was just going to ask you if you were doing anything later on?

Ron

dayyum - i logged off too soon... and i'd just had my weekly wash AND cleaned BOTH my teeth, too!


are you saying that you can get 5W from just one coil pair when using the somaloy core?

if so, that's a problem which i'd be happy to have! (using a 3W DC motor drive)

i'm not sure why in your post #2091 it reads that you're not seeing good results so far

i guess i missed something (..and not just a hot date!)

all the best
np


http://docsfreelunch.blogspot.com

[Tudi]

@konehead : I like the fact this thing is more complex to imagine how it works. The washer helps the magnet on top to stick without flying away, so it is shielding it. If it is shielded then it should not affect the rotor at all. Obviously it is affecting it. So maybe the whole in the washer is guiding the magnetic flux through the coil core. But then the cogging should increase (more flux = more generated electricity = more coging ). So why is it making the rotor speed up ? You might be right about a few things in your post. There might be some magnetic field kickback effect that due to some momentum has a good impact on the rotor speed. Bigger then the negative effect of it's presence. Like Ismael said that the key of shorting is right at the peak to get the maximum + something ( due to hazard ) without interfering to much
@i_ron : it might not be about just the amps, get a lenz-less motor with 1 amp that you run for hours is better then get 5 amps and you get huge coging