Very neat!
It would be interesting to see what power you get out of that little alt, and more interestingly how fast you need to make it spin (I'm guesstimating upwards of 400 rpm just to get enough volts to see DC after the rectifier)
A few of my observations, and questions.
Does it have a ferrous plate behind the magnets to maximixe the magnetic flux density? Are there two magnet rotors to concentrate the flux through the coil legs?
8 coils and 6 magnets is an unorthodox layout, how does the phasing work out? Usual configurations are 10 or 5 coils with 12 or 6 magnets for 5 phase, 9 coils with 12 magnets for 3 phase, 12 or 6 magnets 6 or 3 coils for single phase.
If you need any help planning the layout for your alternators, feel free to ask... small size alternators happen to be something I'm very keen on, as you can see from my
LEGO weight driven generator
@Dizingof... reverse engineering a 'Shaker Light' would help you out - but there's not much power to be had.
p.s. have a search for MOSFET rectifier for the least voltage drop in converting to DC. Geranium diodes also have a very low voltage drop, but they do not have very good reverse voltage tolerance.