Muller Dynamo

[Magluvin]

Hey Loner

Well, I did have "ifs" and "maybes"   ;]

Can resonance be of a higher freq than the rise time of the coil? Lower? 
Could it be that the coil is singing near resonance in Chals setup?

I think he is getting a very quick charge to the 47,000uf cap with the flick of the rotor..

Would it be easier or better to do this out of range of resonance?  Any advantages?

I dont think it would be easy to get these kind of outputs on the gen coils being that far away from the driver coil unless they were in tune of some sorts with each other.

The gen coils may not be tuned yet like the drive due to magnet position when the drive coil sings. If the drive coil is in resonance when it sings, then the posibility of it being able to react with the gen coils from a far is a much better chance than not in resonance.  A scope shot can show good reason as to why.  ;]

There is no real reason why more cant be had by trying things.

Good to see your still around Lone.  Any more work on those cap discharge experiments?

Mags

[mariuscivic]

Well, i got my driving coil singing again and it gets realy hot.Not becouse it's singing, but becouse it's sucking a lot of current. In my case, the hall sits far way from the driving coil and the rotor must spin realy slow (15-20rpm).If i stop it completly the coil sings continuisly when the magnet faces the hall sensor.
I had 3 coils in my setup: one drivind and two pickup coils with no core.
I removed the two pickup coils and replace them with one coil with ferite core. In this case i couldn't make the driving coil sing again. I'll dig deeper

[DeepCut]

If i turn on my bench PSU the coil sings straight away and starts sucking 15 Watts or more, i'm not sure if this behaviour means anything useful.

After spending £30 trying different coils to get acceleration-under-load, i can now get the effect with any old coil ! I think it's important that the core is longer than the coil-former, with the extra length being rotor-side.

I'm also thinking that, although my diametric setup is good for high frequencies, it's bad when it comes to cogging, because there is always a core being attracted to the magnet.

We live and learn, don't we !

http://www.youtube.com/watch?v=iSSOI6Yep_U&feature=channel_video_title

[plengo]

Great work Chal,

I would think that the rotor magnets are forming a "blanket magentic skin" that propagates the magnetic wave to the other gen coils. The flux change per time is huge which would explain the high voltage generated.

I dont think you even need a spining rotor.

Can you test with the rotor positioned to a fix place without spining and still have that effect with the load connected?

It would be very important now to measure better the input energy.

Fausto.

[DeepCut]

Watched the video Chal, very impressive for such a low-speed !

Can anyone explain how OverUnityGuide managed to wind a coil that is :

L : 8.2 Henries
R : 383 Ohms

in this video :

http://www.youtube.com/user/overunityguide#p/a/u/1/IbmharDOA3Y

?

I can't imagine which gauge wire would enable such a ratio, especially on a coil former that size.