Hi Willib.
Well no rotors in there yet. Thats one of the parts thats not done. No magnet rotor, no coils.
I'm thinking 4" diameter also. Thats realy awsome. A dual rotor at 4" with the 12 magnet 9 coil arangement.
I have some 1"X1/2"X1/8" NEOs. I havn't even layed them out to see how many will fit.
It may only have room for 8. If so I'll do the 8 X 6 arangement (Hugh P).
If I can only get 6 in there I"ll make 6 pole single phase. I think 8 will go though?
Yes I would love to see the preformance #s on the littel genny. That would be great.
I thought I was building the smallest dual rotor but you got there first.
The rotors are made from speaker magnet back plates. There easy to tap for shaft set screws and there made of very good flux material and there free.
This one uses a 1/2" shaft. Then I machined it down the match the small cheap box fan blade.
I'm eagerly awaiting your data.
JK TAS Jerry