I just made a pm generator, it has 9 coils 80 windings of #15 spaced in a circle inside a 12" diameter.
I have a board with 12 rows of magnets. this is turned by a Savonius.
With all of the coils hooked in series I'm getting about 2v at around 200rpm.
I got it up to aout 1500 rpm and I still...