Muller Dynamo

[hartiberlin]

The following is a list of input voltage and current readings at the closing stages (12:19) of the first video: -

12.25V, 0.92A - Bulb on.
12.45V, 0.94A - Bulb off.
12.47V, 0.94A - Bulb off.
5.86V, zero A  - Bulb off.

Question: Why do we see the voltage rise from 12.45V to 12.47V, then fall to 5.86V a split second after. It looks to me as if something is switched off at the instant of time between 12.47V and 5.86V.

Hoppy

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....

[woopy]

Hi all

always no litze so going on the testing on the 2 coils.  very very interesting.

so i can say that the stator magnet seems to have better efficiency in a ATTRACTING  position to the rotor magnet and not in repelling as i stated earlier.

In fact in repelling position you get more volts but in sharper wave, so the RMS voltage is not so impressive , but the cost for this sharp voltage is much input power.

So my best result today is always with attracting stator magnet. Will go on the test, but i really need litze to compare those result. (i made dozens tests today with different config and each time is different and a  true  lecture  )

Last for today i tested the Proposal of Dole some post above with the double-inverted FWBR and see the result in comparison wth a single FWBR in same config.

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

good luck at all

Laurent

[toranarod]

In the photo below you can see his rotor and my rotor and a cotton bobbin and the bobbins I had made in relation to the rotor.

if the wire is correct the turns are not going on a sewing machine bobbin
If the output of his coils are 12 volts this has created some concerns.

[hartiberlin]

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 ?

[Hoppy]

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....

I agree Stefan. So I wonder what could produce all that extra energy for self running. Any suggestions anyone?

Hoppy