Muller Dynamo

[hartiberlin]

Okay,
I had another look.
In this video:

http://www.youtube.com/watch?v=o3YqCp84IOE

RomeroUK has set at last the voltage slider of his DC2DC converter
back to 12 Volts and show this on his Digital meter
and then switches off the Capcharging at 18:47 minutes into the
video.
Then the LED of the DC2DC converter stays on up until about 19:30 .

So this is about 43 seconds.

As the cap charge only has about 5.3 Watts-Seconds,
the question is, what will the DC2DC converter do,
when the 47.000 uF cap voltage goes below about 13 volts ?

Will the DC2DC converter then switch off automatically the output
and the rotor will freewheel down its RPM and only
the LED is still on for 43 seconds due to an internal cap
of the Dc2DC converter or has it anything
to do maybe with an another diode maybe
powering some feedback as has been posted on RomeroUK´s
private forum, what user baroutologos said here:

http://www.overunity.com/index.php?topic=3842.msg286721#msg286721

?

[lasersaber]

I just finished the two driver boards.  I powered the unit up to do a quick test. I have only tested voltage on one set of coils.  I get just over 16 volts.

[woopy]

Hi Stephan

i made a quick test with a 10 ohm resistor

see the pix for the result.

If we crudely accept a RMS voltage (through the 10 ohms resistor) of 3 volt for one coil the wattage could be about 0.9 watt = for a set of 2 coil in serie =1.8 watt and as there is 7 sets =12.6 watt, is it correct ? Das ist knapp !!! but perhaps with some more speed at 1400 RPM ??

And this coil is not with litze perhaps it is better with litze  of course we have to use high quality FWBR ( i will use ultrafast shotky diode ).

Will try to wound another coil to check. wow still a lot to experiment. Where are the others ?? Any results ?

@Bruce   yes the stator magnet is in repulsion with the passing rotor magnet. For the second point i make a generative coil and not a motor coil here.

for interested, i have a spacing of 6 mm between the core anf the rotor magnet , i have noticed it is a good efficient position , look at the Romero's spacing it is also about 5 to 6 mm

good luck at all

Laurent

[hartiberlin]

Hello all, I don't know if the real stranded wire diameter 'issue' has been cleared up yet. But I happen to still have a spool of the same wire Romero used. Same wire from the same shop. So I measured it:

In reality this "7x 0.125 stranded wire" has a diameter of 0.45mm.

Regards,
Steven

Hi Steven,
nice find.

Could you please post a clear shot of the wire, so get the spool open and show the wires from
a few sides ?

Many thanks.

Regards, Stefan.

[hartiberlin]

I just finished the two driver boards.  I powered the unit up to do a quick test. I have only tested voltage on one set of coils.  I get just over 16 volts.

Well done Lasersaber.
Looking forward to a few more tests of you.

Many thanks.

Regards, Stefan.