Muller Dynamo

[excessAlex]

Hello everyone, I'm one another (yet another) new user in this thread

many thanks to RomeroUK for his work and for sharing valuable information, thank you all for your cooperation, I follow in silence from now on.

this can be useful in order to build suitable cores?

http://www.youtube.com/watch?v=vZE-pIXipm4

There are many sites where you can buy powder for each type of requirement ( I do not mean drugs! ) .. just look around with google

Alex

[LtBolo]

@all. I previously asked Romero if he had tried stationary magnets on the coils down below [lower deck] He is likely under too much pressure to answer me . HE MUST HAVE TRIED THIS , AS OTHERWISE , THE LOWER COILS COULD BE DOING LITTLE EXCEPT WASTE ENERGY . Has he discussed this with anyone else please ?

Even if he did not have the lower magnet(s), the lower coils would still not be wasting energy, they would simply not be as efficient. The stator magnets are simply establishing a magnetic bias, so when the rotor magnet comes through, you get the best possible rotation of the magnetic field in the coil.

I don't think Muller's original implementation used those magnets; he reversed every other rotor magnet to produce the same result. It is well possible to make it work that way I'm sure, it may simply be easier to get it right doing it the way RomeroUK did it. The challenge to Muller's approach would likely be to get the rotor magnet's field to push all the way up the stator coil, rather than wrapping back to the next rotor magnet. Not hard, but you have to plan for it. Failure to do so would result in a serious reduction in output performance and project failure.

Looking forward to the first wave of replicators! We'd love to jump in with our own, after you guys have paved the way.

[LtBolo]

Was thinking a little about the drive circuit. Don't know for sure, but this design may give a maximum theoretical output of 200%. I saw some suggestion to that effect in some of Muller's stuff, and that appears to be where RomeroUK is once losses are accounted for. In order to get the output power levels to meaningful levels then, the drive levels are going to have to be raised as the output load is increased. Probably only two good ways to do that: 1) increase drive voltage, and/or 2) increase drive pulse width.

This looks like a super candidate for a micro-controller, which might also simplify the drive pulse management. Rather than hall effect sensors and trigger magnets, it might make sense to move to an encoder and quadrature input. With sufficient encoder resolution, you could very accurately control drive pulses to increase power. Could also use the micro to control supply voltage, allowing the supply voltage to increase when you needed more output.

Yeah, that's raising the level of difficultly to a 9.9...but I am licking my chops to jump into that.

[gyulasun]

Well, maybe it is better to put all outputs coils then in series
for higher voltage outputs and only have a normal
silicon diode bridge rectifier then at the end.
Then you could also use a DC to DC converter with high efficiency to transform
the violtage down again.
This way you will only loose power in the ONE bridge rectifier and not
in all rectifiers... This could also save a lot of wasted power in the circuit
and it is cheaper as you don´t need so many rectifiers....
If you make the coils much bigger also a higher current should be possible at
the higher series voltage.

Regards, Stefan.

Stefan,

In case the output coils are connected in series, the output current flows through all the coils all the time and this could cause a much different situation with respect to the present case where each output coil is 'isolated' from each other by the FWBs so the load current cannot flow through all of them all the time: This can be an benefit inherently utilized in the present setup. 

Would be good to know Romero's understanding on this, especially if he already tested the output coils in series connection.  I guess he did  not choose the trouble of using as many diode bridges as the number of output coils without good reason.

IF your series coil suggestion does not cause any negative effect on the output power, then I do agree with it. Even the relatively cheap PC supply 'boxes' could be used for accepting the much higher AC output voltage for the series coils and would convert it down the DC 12V, 5V etc.

rgds, Gyula

[bourne]

I cannot find reference to the gap between the magnets and the coils?

I think 3mm-4mm has been mentioned. But this is the magnetic tuning gap along with the gap between core and fixed magnets.
all these gaps should be adjusted to allow magnetic interaction without being over-powering and locking the rotor down to 1 particular position.

Like Romerouk said, tune it then go back and tune it again, and keep tuning it until it is perfect.

Fine pitch threaded rods are a must for easy tuning IMO.

I hope this helps