Muller Dynamo

[mondrasek]

Thanks M.
That gives me an insight.
I am in my tests not yet satisfied with the voltage and current i get out of several individual test coils.
However i assume that the add-up of the differently phased signals
closer to the P2P values and hopefully the non-linear acceleration effect
of the biasing magnets on a full rig will contribute to higher extracted energy.
Therefore, even though i always avoid mechanical builds due to lack of tools and two left hands concerning this, i think i will put together a (probably crappy) bigger system with more o/p coils.

I tested first with a single coil pair too.  I rushed into my tri-coil pair setup much too fast, but there were so many more tests to do.  Unfortunately changing the tri-coil setup does take much more time once you figure out what kind of test you want.  But having multiple coil pairs available at least answered some of my questions and turned some variables to constants in some ways.

Please note that the data I just posted measures the Vin and Iin to my 2-phase BLDC drive motor REGULATOR CIRCUIT.  I can turn down the output V of that circuit that supplies the final BLDC driver circuit with a potentiometer.  But doing so means I am just wasting the unused input V to the regulator circuit as heat (the voltage regulator heat sink gets to 50C+ if Vout is low).

My antenna testing measurement setup has been switched to measure the output of this energy wasting regulator which is also the input to the BLDC motor drive circuit.  I think that the result should be a better Pin to Pout comparison.  I'll post those results as soon as real life let's me complete the testing.

M.

[Rawbush]

Thanks M.
That gives me an insight.
I am in my tests not yet satisfied with the voltage and current i get out of several individual test coils.
However i assume that the add-up of the differently phased signals
closer to the P2P values and hopefully the non-linear acceleration effect
of the biasing magnets on a full rig will contribute to higher extracted energy.
Therefore, even though i always avoid mechanical builds due to lack of tools and two left hands concerning this, i think i will put together a (probably crappy) bigger system with more o/p coils.

Does anyone still have the rotor & stator dimensions of Romero's Build at hand? There was a couple of docs out there, that actually had wrong
dimensions. I think his Rotor was 25cm instead of 20cm.
I think someone even made a nice laser-cutting bmp earlier in this thread.
Guess i'll have to re-read it )

Do the shaft and the threaded rods have to be non-magnetic material?
Maybe it doesn't influence the magnets.

If you use a magnetic material it will become magnetized, also the bearings will too. You can find cheap skate bearings that are ceramic balls in steel case, or full ceramic. The only down side to this is the shaft needs to be 8mm for bearing I.D.
Peace
rawbush

edit: It is better yet to have no shaft as there is no need for shaft power, If you take the shaft away you also take away some friction.

[xenomorphlabs]

If you use a magnetic material it will become magnetized, also the bearings will too. You can find cheap skate bearings that are ceramic balls in steel case, or full ceramic. The only down side to this is the shaft needs to be 8mm for bearing I.D.
Peace
rawbush

edit: It is better yet to have no shaft as there is no need for shaft power, If you take the shaft away you also take away some friction.

Thanks for your answer.
Maybe i used the wrong terms, as i have no mechanic background.
With shaft i was referring to the bar through the center of the rotor/stator connected to the bearing as in

http://cgi.ebay.co.uk/ROUND-BRIGHT-MILD-STEEL-BAR-30mm-DIA-x-500mm-LONG-EN1A-/160559436733?_trksid=p5197.m263&_trkparms=algo%3DSIC%26itu%3DUCI%252BIA%252BUA%252BFICS%252BUFI%252BDDSIC%26otn%3D10%26pmod
%3D200483819019%252B270303908644%252B280671794575%26po
%3DLVI%26ps%3D63%26clkid%3D9015277603306153476

Romero seems to be using steel, not sure if it is non-magnetic or magnetic steel.

[Rawbush]

Yes mild steel is very magnetic. I think any interference would come from the rotor not being large enough diameter for the magnets used in it.  But I have taken apart a few rotors and I can stick needles to the bearings and steel shaft. I don't know how much this effects the bearings?
rawbush

[futuristic]

Your "Romero's picture" IS NOT Romero's picture.

Well I was trying to show the waveform type. I just horizontally flipped the bottom hill of the regular magnet motor waveform.

I am confused about your statement. That picture you showed is nothing to do with Romero's.

Ok.... if that is your opinion.
But please try to be objective as possible while looking at this image below, and tell me which waveform has more similarities with Romero's...