The Ossie motor

[Jimboot]

I'm also thinking about getting a coil around the rotor itsel, just clear of the mags. The mags I've found in rechargable torches (flashlights) are very weak ceramic ones. The neos should way outperform them. I have some prewound coils out of the torches but I think I need to wind perpendicularly around the rotor somehow for max effect.

[Jimboot]

Ok I have wound a pickup coil but getting nothing from it. What have I done wrong here?

[Jimboot]

I thought lighter gauge wire was what was required for pick up. Obviously not in this config. I'll try a heavier gauge

[gyulasun]

Ok I have wound a pickup coil but getting nothing from it. What have I done wrong here?

Hi Jimboot,

I think the pickup coil is too big, compared to its active part that just faces any two magnets. I mean the active part where induction can happen is too short with respect to the total coil's circumference.
A possible solution could be to use one single air cored coil for one single magnet, the diameter of the coils would be about the same as the magnets and the coil diameter coil thickness ratio could be around 3 or 4 (I mean not long coils).
I know this is much mechanical work to fix 8 but much smaller coils (compared to your present big 4 ones) but I think it could induce quasi optimally. (With precise positioning so that all the magnets and all these coils could face each other in the same moment, the coils could be connected in parallel to enhance current loading capability, this reduces generator inner impedance; but this is not a requirement of course.)

Maybe there are smaller audio cross over coils ready made in the shop where you got your present 4 big coils from?

rgds, Gyula

[Jimboot]

@gyulasun Thanks. I thought that may have been the case. I'll go to Jaycar today to see if I can find anything.