Muller Dynamo

[Mem]

Here is interesting replication
http://www.youtube.com/watch?v=KdxMbCU7O8c

This is a good replication, once he installs more power pick up coils, I believe he will be able to close the loop. 

[baroutologos]

I have been going over the wire figure's  We are all wondering about the Dia of the wire and keep coming up with the wrong answer.
the other point is we also cannot figure out the voltage is low if we go by his coil specifications.
I have been going over the figures time and time again.  What if its the turns that are wrong.
the coil dimension and the voltage out and the wire used would imply the turns are wrong.  I calculate the tunes to be around the 700 mark to fill the coils how they look in the photo's if he used 7 X .125.

How u managed to calculate voltage? Romero's device has some considerable RPM,...  Anyway, regarding wire, i have already ordered the sewing bobbins (have i told you that Romero used sewing bobbins?) and i will fill one with various AWG wires and see myself what to put so as to match the illustration. (litz will be put finally ofc)

[xenomorphlabs]

I have been going over the wire figure's  We are all wondering about the Dia of the wire and keep coming up with the wrong answer.
the other point is we also cannot figure out the voltage is low if we go by his coil specifications.
I have been going over the figures time and time again.  What if its the turns that are wrong.
the coil dimension and the voltage out and the wire used would imply the turns are wrong.  I calculate the tunes to be around the 700 mark to fill the coils how they look in the photo's if he used 7 X .125.

Basically pretty much all values stated by Romero seem to be unfortunately
off from what they really are in his device. Maybe he wasn't going over groundloop's and Stefan`s diagrams with the necessary attention to be able to correct the values or he just built away and later on couldn't remember what
sizes of components he did indeed use for the device.
From my analysis of the coil close-ups, i am pretty convinced that he used
sewing bobbins. I base that conclusion on measurements i have taken on the image assuming that he did at least make not a mistake by stating that his core diameter is 6mm. If that is so then the length of the bobbin amounts to 11.5 mm
I have personally not been able to fit more than around 250 turns of 0.375mm wire on such a sewing bobbin without the wire falling off.
EDIT: i tried different Litzes to somehow reach a similar diameter, just realized that i did use a bit bigger diameter than that at first for the 250 turns, so 300 might indeed be possible. Needs to be confirmed though.
It seems even likely that like all other values for the device the 300 turns are a guess rather than a verified value.

[Dave45]

Thanks for all the help, and great vids Mags

[Pirate88179]

I agree about the VCR head bearings as I have used those on my Bedini replications and can hit over 10,000 rpm easily with no problems.

The other option I believe Romero mentioned was used hard drive bearings and they are pretty good also.  I have used those in several projects as well.

Just a note, true ceramic bearings require no lubrication.  We used to make those for prototypes 20 years ago.  As long as it is ceramic on ceramic no lube needed.  That was one of the main advantages as well as a very low coefficient of friction. We used partially stabilized, transformation toughened zirconium oxide but you can also use silicon nitride as well.

Bill