| email@example.com wrote:
|> On Tue, 19 Aug 2008 14:51:46 -0700 Salmon Egg
|>> Use a pulley system or gear box to match your alternator. It is a
|>> of mechanical impedance matching.
|> An alternative to that would be a 240 pole alternator (or some big
|> number in that range). That would be quite an incredible alternator
|> design, but it might work. But the gearbox would certainly be the
|> practical and obvious approach to a simple setup.
|> Imagine a large rotor with 240 magnet poles of alternate polarities,
|> and around that rotor 240 windings, also in alternate polarities.
|> Every 1/120 turn would complete a full wave cycle. At 30 RPM, you'd
|> get 60 Hz. That mover will need a lot of force behind it. A
|> variation of that would make
|> for 3-phase power, if needed.
| On a practical point, in order to get that many coils in a circle, you would
| need a pretty large diameter stator. Something like the large hydro
| generators used at Niagara are still much fewer poles than that and those
| are something like 12 - 14 feet in diameter.
| Or use really, really teeny, tiny wires ;-)
At 12 feet diameter that's less than 1.89 inches per pole around. Given that
12 feet is really impractical for a home projects, this is going to be a much
But I'm thinking it would not need very many turns on each pole since all 240
poles would be in series. So at 1/2 inch each, this would need a stator at
least 3.2 feet diameter. It could be done. Whether it is worthwhile, only
the OP can say. I have no mover of such a speed. Maybe a waterwheel?
Note to the OP: If you choose to build such a beast, be sure to NOT wire the
poles in series _sequentially_
but instead, wire half of them in one direction
around the stator, then half back the other way around. That way you don't
end up with a big giant inductor.
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