Muller Dynamo

[scratchrobot]

Glad to see you got her rebuilt.  Looks smoother now.  I didn't see any magnets on top of the coils yet?  I think that makes a big difference.  Also have you tried what woopy has mentioned regarding paralleling the gen and drive coils?  Also I'm sure the AC cap idea is going to make a considerable difference. 

  Did you go with plastic this time for the rotor?

Thanks, yes got her back to life ,I made rotor again from MDF but runs much smoother now and almost no wobble anymore, I also had to make some new coils. I tried the magnets on top of the coils and can get a little more out with them without rpm drop but nothing, I also tried Woopy's idea and it helps but still a very inefficient dynamo. I will try the AC cap idea and some other things.

regards,
scratchrobot

[scratchrobot]

https://rapidshare.com/files/4084301451/Forum_page_8.zip

PLYZ .... PAGE 9 , 10     THANKS...
Would you have the other pages available? Would you share them if you have?

Many thanks,

Thanks for that page! Does someone has the other pages please?

Regards scratchrobot

[hartiberlin]

I managed to restore my dynamo but no magic yet 
Also no luck with extra magnets on coil, I gain a little with them but my generator is not very efficient.

http://www.youtube.com/watch?v=JTlq-vaerG8

scratchrobot

Hmm,
seems to be very load dependend.

Romero´s unit was not so load dependend.

So under load about 12 Watt in and 4 Watts out ?
Did you also measure the current through the bulb ?
How much was it at about 10 Volts ?

Maybe Romero had really mixed up his driver coils polarisation
and had one coilpar in attraction and one in repelling ?
Could this have then more output power and be less load dependend ?
Did you also use Litz wire or normal wire for the coils ?
Where exactly are your hall sensor and please can you speak next time to
your video and explain it in more detail how you build it up ?

Many thanks.

Regards, Stefan.
Many thanks.
Regards, Stefan.

[hartiberlin]

Lidmotor now has a setup, which is not load dependend.
See his video and his answers in the description there:

http://www.youtube.com/watch?v=FLRqM0nDT_M

[capthook]

Many fantastic builds shown.
ClaNzer - best stuff ever.
And many others of astonishing quality.

A recent mention of the Muller 'cone' shaped coils.
The theory is a larger percentage of he power is produced in the windings further away from the rotor
reducing Lenz cogging, yet power produced is still ample via the cores.
Also, ferritte is a rather poor replacement to the original Muller cores imo.

The magnet/coil geometry is so that when 1 magnet is over the coils producing, you have two other magnets elsewhere being attracted to their approaching coils cores, again reducing cogging.

The NNNN rotor magnet arrangment also seems a poor tradeoff as power produced is in relation to a *changing* field - which you of course get a much greater change with NSNS.
Litz wire also seems to not be a 'key' either as I see no added benifits.

The biasing magnets on the gen. coils shouldn't offer any benefit
as +1 here = -1 there resulting in 0 as a brief response.
On a pulse coil however, it *can* offer a benifit by increasing the effectiveness of a low input.

Lastly, why so convinced it's a self-runner?
The battery hasn't been *completely* removed, 
the dc/dc is still connected to the negative terminal.

The capacitor could be of question?

And the fact that there is *no* change to the operation of the motor when a load is applied is suspect as well.
There should be at least *some* change, if even brief.

Again, awesome builds/work to many!