Finding the right generator

[TinselKoala]

Never mind.

Getting back to the science fair, I hope you and your kid have a great time.

[khabe]

Yeah, but when you need bit bigger generator than spoken above and  buying 6 small diodes does not kill you as well as assembling - then I can recommend well built brushless servo motor from ebay:
http://cgi.ebay.com/BLDC-servo-motor-robot-lathe-mill-cnc-encoder_W0QQitemZ260303719487QQcmdZViewItemQQptZLH_DefaultDomain_0?_trksid=p3286.m20.l1116
$5 + shipping  Encoder from back side you just take apart and throw away. It has hollow shaft OD 1/2" and id 1/4", well made motor, four poles rotor, 24 slot stator - scewed rotor segment magnets - special shape + vintage overlapped winding cheme gives brilliant coggingless run. Rotor OD ca  43.5mm, Total OD ca 102mm x ca 60mm, bearings are rubber sealed 9R8 made in Japan.
Good and cheap found for several projects.
regards,
khabe

[pese]

see the last of 3 bridge rectifiers.
the 2.AC  is not connected.
so that cant work
Pese

P.S.
------------  Additional "Post Script"
I controlled again.
It is roght so - as designed.
(sorry, I was to fast .. and not seen my error)
Pese

[Yucca]

For a small wind genny you could use a brushless outrunner motor similar to what Khabe is recommending.



They are small motors for model cars and planes that have moving neo mags and stationary coils. They are VERY efficient motors and make quite efficient gennys. (Might have to gear your turbine output up a little though?)

They come in all sorts of sizes from tiny to large so you should find one to match your turbine. They are also quite cheap on ebay:

http://shop.ebay.com/?&_nkw=brushless+outrunner

They will generate 3 phase AC when cranked. With bridge rectifiers feeding a cap you get rough DC, can then use efficient regulator for proper DC.

[Yucca]

Yeah, but when you need bit bigger generator than spoken above and  buying 6 small diodes does not kill you as well as assembling - then I can recommend well built brushless servo motor from ebay:
http://cgi.ebay.com/BLDC-servo-motor-robot-lathe-mill-cnc-encoder_W0QQitemZ260303719487QQcmdZViewItemQQptZLH_DefaultDomain_0?_trksid=p3286.m20.l1116
$5 + shipping  Encoder from back side you just take apart and throw away. It has hollow shaft OD 1/2" and id 1/4", well made motor, four poles rotor, 24 slot stator - scewed rotor segment magnets - special shape + vintage overlapped winding cheme gives brilliant coggingless run. Rotor OD ca  43.5mm, Total OD ca 102mm x ca 60mm, bearings are rubber sealed 9R8 made in Japan.
Good and cheap found for several projects.
regards,
khabe

Now that´s a good bang for the buck! Shame the international shipping is too high for me or I would go for a couple of those!