how would you modify the stator design to allow faster speeds?

[xymox]

I'm just curious, If one wanted to buld a low prm alternator so that it could comfortably put out 3KW under load. say from a 6hp engine. What specific changes would need to be made to the dual rotor design. I assume most changes would need to be made to the stator.

Thanks for your imput.

[scoraigwind]

There are three ways to increase the speed.  Increase the battery voltage.  Decrease the turns per coil  Put the coils more in parallel and less in series.

Al of these will increase both speed and output.  

You could also increase the space between the magnet rotors or use a big resistor in series with the output, but these are not so good for the efficiency.

[Ungrounded Lightning Rod]

In addition to Hugh's suggestions I'd be sure the rotors were balanced.

[tecker]

Big time Copper 3 or4 strands of 14 with large mags .Your going to be see good efficiency

at 1200 rpm .That's if  your wanting Dc  load. You can take your pick 12, 24 ,36 ,or 48 . That's the higher amperage coil design. You didn't say what voltage you need. If you want higher Rpm or line voltage I think you should plan out a motor conversion. All that plastic is hard to keep balanced at 1.5 k or higher I've run a couple to 2k and some special balancing technique has to be employed.