Muller Dynamo

[konehead]

Hi Chalmalad

Are you shorting the coil too, when it oscillates? Is it being pulsed at a specific frequency too if being shorted?
i dont know if it is ferroresonance, since the input amps seems to go way up - I would think the input would go down if core is in some resonant state like if coil is in resonance but maybe there is a clash between the coil and core causing the increase but dont know just a guess.

[chalamadad]

Hi Chalmalad

Are you shorting the coil too, when it oscillates? Is it being pulsed at a specific frequency too if being shorted?
i dont know if it is ferroresonance, since the input amps seems to go way up - I would think the input would go down if core is in some resonant state like if coil is in resonance but maybe there is a clash between the coil and core causing the increase but dont know just a guess.

Hey kone,

The effect stops after shorting. What I can do is hook up a diode the way you would catch the BEMF and put that into DC cap and then back to the positive coil. That almost killed the diode.

Once excited I can stop the rotor and it would continue oscillating. The oscillation is very rapid, very uniform and the frequency can be changed by regulating the input voltage to a certain degree.

Interestingly a frequency change is also audible if you move a magnet closer to the coil while it is ringing. So you can hear a change in the coil by introducing magnets.

[chalamadad]

Someone asked me where I bought the iron powder cores so I am sharing the link with ya'll.

http://www.spulen.com/shop/product_info.php?products_id=747 (it's a German shop though)

I understand now that heat is a big problem. In this resonant state (whatever it's cause) you can easily melt your coil. That's probably why Romero chose the soft ferrite (like he says, heat is a problem). So I am not sure if these iron powder cores are the final way to go, but for testing and gaining experience it might be helpful.

[firlight]

Hi Luc
               With regards to the increase of core inductance,This is quit normal.as these
  cores are "Square Loop" .Bringing the core close to a bias magnet will push it into
a high permeability zone of the core.For your interest this effect will also occur  in other non tape wound cores ,but are Square Loop..i know this having worked with square loop cores in the construction computer memory stores in the 1950`s.
You will find the toroid's make really good pulse motor drivers.
also check this out.

http://www.metglas.com/downloads/finemet_magamp.pdf

Best Regards Dave

[plengo]

This video from you mariuscivic http://www.youtube.com/watch?v=naXG9M_qld4 is screaming to us the path we should go.

You demonstrated on this one video the acceleration (delayed Lenz) under load using a transformer as a "decoupling" mechanism, the biasing magnet effective use and the necessary speed to "break through the Lenz barrier".

That explains why so many can not achieve anything so far, including me. In my case I have way too little rpm.

Also it corroborates once again with Romero assertions. More we progress more I see ourselves getting closer to OU.

Thank you and great work.

Fausto.