I took an ECM - put a large squirl cage blower wheel on it - put a belly band mounting on the motor - placed it 3 ft away from an old belt driven blower and produced 60Vac 3ph (with the end bell off the motor)
It may have been more efficient with a BLADED fan, but I am interested in VAWT tecnology so I don't have to commutate with the wind dirrection.
I have been told those ECMs are 3/4 HP so you do the math.
Check into VAWT (Vertical Axis Wind Turbine) on Youtube.
Or check this site out
http://www.helixwind.com/en/index.php
http://www.everwindpower.com/
Those who dance, appear insane to those who do not hear the music.
Those who believe, appear ignorant to those who do not know God.