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The hard part is how much current do you get for what voltage at what RPM? When I asked this question of several people, I was given a choice:
1) Guess. Test. Repeat.
2) Buy a product that is rated for your requirements.
I think it would be best to start with a motorcycle stator that put out the right current and was the right size to fit over the crank and inside a modified crankshaft pulley. From that point, you would build a prototype PM rotor (crankshaft pulley) and simply play with the air gap to get the right output voltage. You don't have to change the gap much to get a big difference in voltage. You might have to swap the magnets for more or less powerful ones if the output voltage is WAY off.
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