Why a VAWT?
Is it because of your location, in an urban area? Is it because of the size alternator you plan? I'm no expert but from what I've done with VAWT's I think 200 RPM's in a 12 mph wind would be what you could expect unloaded, or at least in the ballpark. Add that huge alt you plan and I wonder if you'll ever see cut-in especially at 24 volts.
Just how much power do you expect to get to make your work worthwhile?
Although your wind is not great, 8 to 12 mph winds with a HAWT can still go a long way to keeping some batteries topped of for emergency or occasional use. Maybe more depending on your skill, your site and the efficiency of the alt.
Just my opinion,Andy
I can't be more specific yet. [ Parent ]
Increasing linear velocity gains you nothing. The angular velocity is not changed and the volts remain the same. All the larger diameter does is let you use more magnets. It is the increase in number of magnets that gains you something.
Surely the best way to move magnets past coils faster is to increase the rotational speed ( angular velocity). With increased speed the torque falls for a given power and everything points to a HAWT .
I see no real difficulties with a larger stator but I also see no need for it to be big unless you want lots of power. If you want lots of power in low wind then you need a large swept area and the alternator problem will be insignificant compared with the blades.
Flux[ Parent ]
