Muller Dynamo

[Magluvin]

uggg   one more thing fora sense of direction..

lets say the litz 7 strand is 2ohm at 300 turns.

I dont have this wire.  But if you had all the strands in series, you should have 14ohm.  18v/14ohm=1.28amps

1.28amps x 18volts = 23watts   

Those numbers sound great to me.  Is this good watts err wut?  ;]   And thats if 18v is minimum with this config.

Night, sleep tight, dont let the bifi bite.  ;]


Mags

[nul-points]

Hey Poynt,

I have it on good authority that the scope shot that everyone is attempting to replicate is
the trace from a SINGLE COIL from a pair. The advice was, not to dwell greatly on this trace.

Penno

the main reasons 'not to dwell greatly' on the rUK trace, are because none of the usually helpful supporting information was provided with it, ie.:

- volts/grad?
- timebase?

and the conditions under which the trace was obtained: eg,

- single coil or combined coil-pair? 
- was the load just the buffer cap (no looping) or was the buffer cap looped back to the drive circuits via the DC convertor?
- taken from a complete running system or was it from one of rUK's earlier test runs with less coils?

all in all, a mine of non-information 

[penno64]

Hi NP

I know you are pretty knowledgeable.

Can you best guess or help us understand why Slider's coil lights the neon before being pulsed.

Has he accidententally positioned his coil/mags right on the blochwall ?


Regards, Penno

[konehead]

Heres a quote from romero way back around page 8 or so:

"The gap from the rotor to the coil I had it increased and decreased hundreds of times to get it right."

I alwasy thought this was strange quote from Romero, since its not that hard to just set airgap at 1.5mm or so and call it good and it shouldnt take hundres of attempts really - its as "simple" as putting brass feeler gauge or something between magnet and rotor magnet and then bolting it all tight....

So this leads me to believe that the big time-consuming trick and what is hard to get right in these romero-rigs is that airgap....I bet the tolerance is probably 1/4mm or something like that and when you finally get the right air-gap(s) it will/should accelerate under load at certain rpms in this particular design of romeros.......

I still cling to hopeful theory it is actually the DIFFERENCE /RATIO of the gap between the upper coil and rotor magnet, and the lower coil and the rotor magnet,  that will cause current to be at max and voltage zero sort of staggered resonate effect, (which also can be done with caps) and helper magnets help alot but first you have to have that perfect airgap-ratio between upper and lower...

seems like for instance 3mm airgap on lower coil and 1 mm on top coil will mean current in lower coil will be staggered, delayed a bit in time as seen on a scope, and so it will also stagger the current in top coil too since they are connected, and voltage doesnt care about the airgap in where its peak is in TIME on a scope, (you will have more or less voltage with different airgpaps , but it never changes the "where" in TIME that voltage peaks with the airgap  -  except for maybe extreme airgap where flux field of magnet starts to bend dramatically...
and seems to me that with different airgaps, current will be greater, or less, in amperage shown on scope, with different arigaps too, jsut like voltage does, but ALSO the where-in-TIME that the current peaks, or is at zero, can be adjsuted with the airgap and this time-relationship to the votlage will cause a resonant condition and caps fill like crazy at that point....

every motor will have different airgaps that make them resonate, and so it is really not that easy as just making exact copy as we all hope but have to tune and tune and adjust and adjust and adjust and you will always find something in the very last place you looked for it too

am I wrong about the airgap between magnet and coils will be an adjustment method for the "time-events" of current, just like series AC cap does? 

[nul-points]

 

Hi NP

I know you are pretty knowledgeable.

Can you best guess or help us understand why Slider's coil lights the neon before being pulsed.

Has he accidententally positioned his coil/mags right on the blochwall ?

Regards, Penno

LOL @NP being 'pretty knowledgeable' ...

i just come in to the thread from time to time to sweep the floor and make sure lights are off, after everyone's finally gone home each night 


good old Slider - just the sort of YouTube upload i like - 'hey guys, look at this weird $HiT!!! ....btw, sorry about the cat'

sometimes i think that the long-term future well-being of the planet depends on the backroom efforts of folks like Slider

but before that happens, one of us needs to take him down to Maplins and buy him two jumper leads with croc clips at either end


so, by now you can see that i haven't a clue what was going on in Sliders 'labspace'


it did occur to me that he's using a Wall Wart as a PSU and these babies often have significant ripple if they're unregulated

if that applies here, it's just possible that a slight amount of mains hum could be tipping his drive circuit into oscillation** - this could light his neon without any rotor movement
(** IF it needs any tipping!)

if his drive circuit IS near oscillation then maybe that explains the rest of the gig...

eg., adding the CFL across the coil dampens the resonance of the self-induced oscillation and the motor/hall sensor sequence starts operating correctly (ie. giving high speed)


i'd really hate for this to be close to the answer because i much prefer the scenario where Slider connects something completely random across the coil and suddenly the universe opens its legs and says "take me, i'm yours!" 

is everyone done here? - can i sweep the floors now?
np


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