Muller Dynamo

[neptune]

Probably the biggest problem in this build is the rotor ,shaft and bearings . If you are going to spin 4 Kg at 5000 Rpm , you need good mechanicals .I hope to get mine custom made . One "bodge" idea is to use a washing machine motor with the pulley and brushes removed , and then get your local model engineer or latheman to make a mounting flange for the rotor .Visit your local scrapyard/recycling centre . Large ceramic magnets are obtainable from the magnetron in a microwave oven , but discharge the high voltage cap first .These caps can hold a charge for weeks . Also inside the magnetron are 2 ferrite core , similar to the ones recommended . Wire . I shall probably use magnet wire initially as I have large stocks . Copper wire sizes refer to the bare wire before it is varnished .A rough way to measure wire without a micrometer  is to close wind 10 turns on a nail , measure with a ruler and divide by ten . All replicators beware . Do not move machine when running at high revs . The gyroscopic forces could remove your head .

[gauschor]

Hi Groundloop, I am not clear in the following things:

1) How are the 4 driving coils (2 pairs) connected to each other, because the hall circuit shows only one (+) and one (-), but in fact we have 4x2 = 8 wires to connect?

2) The remaining 7 coil pairs: where exactly is the rectifier placed? And which parts are connected in series?
Is it that way: each coilpair (upper+lower) leads into a shared rectifier and from this rectifier the wires are connected in series to the other rectifiers? Or is it different like: each single coil has its own full bridge rectifier which then is connected in...*guessing*

[Groundloop]

Hi Groundloop, I am not clear in the following things:

1) How are the 4 driving coils (2 pairs) connected to each other, because the hall circuit shows only one (+) and one (-), but in fact we have 4x2 = 8 wires to connect?

2) The remaining 7 coil pairs: where exactly is the rectifier placed? And which parts are connected in series?
Is it that way: each coilpair (upper+lower) leads into a shared rectifier and from this rectifier the wires are connected in series to the other rectifiers? Or is it different like: each single coil has its own full bridge rectifier which then is connected in...*guessing*

@gauschor,

There are 9 coils on each side of the rotor. You connect two coils (directly opposite to each other top and bottom) in series.
Now you have 9 pairs of wires. You select two pairs of wires to be motor coils. Those wires connects to two
switch electronic that uses Hall sensors to detect a magnet passing. You connect the input of those two
switches together (plus to plus and minus to minus). You now have two wires input for motor control.

Each of the remaining generator coils is connected to a diode bridge. The plus out put of each diode bridge
connects to the plus of a 47000uF 25 Volt electrolytic capacitor. The minus of each diode bridge connects to
the minus of the 47000uF capacitor. You now have one pair of generator wires going out from the setup.

GL.

[gauschor]

Thanks for the schematic this really helps

edit: Uh wait, u have 2 caps with different capacity? Is this the big monster cap from the video? but why 2 of them

[Groundloop]

Thanks for the schematic this really helps

edit: Uh wait, u have 2 caps with different capacity? Is this the big monster cap from the video? but why 2 of them

@gauschor,

I think @romerouk did say in one of his posts that he did use the small capacitor
on the output from the diode bridges. I may be wrong, but it can't do any harm in any case.
Also not shown in the above drawing is the four 1N4007 diodes soldered in parallel on each diode bridge.

GL.