VAWT cutin+coils

[fungus]

I started this here (http://www.fieldlines.com/story/2008/2/5/21752/02729),

Got all the wire stripped out now and the connections noted.

The wire I measured at 0.57mm dia - or 23 guage I think , the original ametek motor cuts in at 330rpm with 40 turns of wire.

I'm planning to put this on a Lenz2 rotor, probably 2*3 or 3*4, will have to see, just wondering what would be a good cutin speed to plan for?

Also, I'm a bit worried that the wire needed would be a bit too small, would probably have to be near 0.2mm dia ...

Any ideas?

[windstuffnow]

  The cut in speed will be determined by the diameter of the machine.  You can find the rpm's that it will run using the following formula...

Windspeed x 88 / ( diameter x 3.14 ) x TSR = rpm

Windspeed in mph

diameter in feet

Tsr unloaded would be 1.6

Tsr loaded for peak performance would be 0.8

The "88" simply converts mph to feet per min.

On a 3ft diameter machine your looking at a cut in speed of 56 rpm in a 6 mph wind.

.