Originally posted by toranarod
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I am as sure that this will increase the results just as sure as I was when I suggested that you try a MuMetal core. It may need some tweaking, but I bet it will work.
IF SOMETHING DOESN'T MAKE SENSE PLEASE ASK

The idea is that as current starts to flow in the pickup coil, it creates a magnetic field that interacts with the rotor magnets in a positive way. Going along with Elias' theory of the need to minimize resistance and maximize inductance this is one idea I have come up with.
Basically you use large copper pickup wire along the length of the coil. This is hooked in series to a pancake coil or two that is made out of Litz wire. The Litz wire will help increase induction while minimizing resistance. It all can be Litz wire I suppose. Anyways, the pancake coils are in series with the pickup wire, and are connected in series (parallel to each other though) AFTER the pickup wire.
An even better idea than the pancake coils would be to build this particular version of the Rodin Starship coil. Check this out. (This would really maximize induction while minimizing resistance.)
Anyways, the design should work if coil inductance is participating the way I think it is. Like I said we may have to dial in the exact layout, but you should get the idea.
Oh, one other thing to note. IMHO the direction you should wind your coil is directly related to the pole you have facing the coil from the rotor magnet. The direction of winding will determine which coil induced pole faces the rotor magnet at certain times. If your coil isn't working like you want, try flipping the rotor magnets over. (Elias, that one was for you). Notice that in a Muller design, you will need to wind the coils on one side of the rotor opposite from coils on the other side. If I have it right, clockwise wound coils should face south poles and counterclockwise would coils face north poles.
This is already a lot to put in one post so I will cut it off there. Please ask any questions you may have.
ron




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