Muller Dynamo

[nul-points]

What still puzzles me is,
that in the first video:
http://www.youtube.com/watch?v=8KVU3ZM14rw

the RPM is almost the same as the in the second video

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

but in the first video the output voltage is only 12 Volts under load,
but on the second video it is 15 Volts under load.
(before the DC2DC converter)

Also in the first video, as he switches on the Bulb load the motor does not decrease the slightest bit in RPM. ( at least you can not hear anything..)
but the battery voltage decrease a lot...
So is the bulb in the first video just powered by the battery ?
Is there a hidden cable from the plus pole of the battery to the rectifiers ?

This could only be explained otherwise,
that if there is really somewhere an additional recovery diode going to the plus pole of the battery, that when the bulb load is switched on,
this recovery voltage goes down also and the battery will not get any recovery voltage...
But one should at least hear any RPM change, don´t we ?

What is your opion on this ?

Stefan

i believe that Romero did not connect his 47000uF buffer capacitor until the 2nd video (just a small one perhaps in the 1st)

i think he may have mentioned that the output improved

but in any case, the battery would have been a better clamp of the motor drive, able to sustain higher current (for reasonable time) compared to the DC converter (which can only work up to 36W before it's o/p will be affected)

also, in the first video, he had looped the o/p back to the battery via diode, which would have clamped the 'o/p' at battery voltage + say 0.7V

he did say that the o/p voltage fell back to 12.3V in the 1st video because the lamp reduced the available feedback, & so the diode wasn't able to hold the voltage up to say 12.6V

i don't think we need to start looking for hidden wires again yet! 

cheers
np


http://docsfreelunch.blogspot.com

[nul-points]

ZeroFossilFuel is joining the replication race
[...]

as with the 'human race', i would have have thought that the achievement is to complete the course...

...NOT to be the 1st person to arrive at the finish ! 

[nul-points]

:)ole

in the schematic shown in this referenced  post earlier, some of the diodes are connected 'anti-parallel'

is this intentional? 

woopy, did you copy the schematic - or did you make each external diode have the same polarity as each internal diode inside te FWBR?

thanks
np

[EDIT: *** OK, i believe the FWBR has been drawn rotated by 90 degrees by mistake  - hope no-one's copied this in their cct!    *** ]


http://docsfreelunch.blogspot.com

[hartiberlin]

It seems that a complete wave simply desappears !! where does it go ??

good luck at all

Laurent

Hi Laurent,
well done tests.

I guess you have at least one diode wrong.
Put them only so that you have 2 bridge rectifiers in parallel.

Hope this helps.

Regards, Stefan.

[plengo]

Hi Hoppy,
you are right.

I just watched it carefully again.

Here:
http://www.youtube.com/watch?v=8KVU3ZM14rw
at minute 10:05
he pulls off the battery powering the motor coils.

Then you see the voltmeter directly go to about 5.88 Volts.

As he has connected still the driver coils to the voltmeter via the freewheel
diodes 1N4007 now we can see, what at nearly full speed the driver coils
BackEMF puts out.

At about minute 10:34 you can see the voltmeter again having only about 2.20 Volts and then going down
the next seconds to 1.72 and 1.45 until the RPM stops.

So we know now, that the recovery diode is(are) not the 2 freewheel diodes 1N4007
as they are producing to low voltage....

In the end of this video one can for sure see how the manets are arranged. You can see that the rotor will stop with one magnet locked right under a coil WITHOUT a biasing manet while all coils with biasing magnets are forcing the rotor magnets to stay in between two other coils clearly showing that the biasing magnets are repelling the rotor magnets.

I would go further to say that the coil where it has a rotor magnet locked under it  is a trigger coil.

Fausto.