This is about changes I have made on my 22 foot duel rotor, which is three phase and is wired for 48 volt.
In building this one, I wanted to end up with a turbine that hopefully would last a long time, and would almost continuely keep my battery bank full at a very low RPM & would stall at about 20 to 30 amps. I think I have accomplished this, due to testing in winds from almost zero to 50 mile gusts, and many changes by raising the tower up and down. The pictures below will show some of the changes,
In one of my previous posts, I noted that I had a very loud harmonic viberation that did get better with some changes, but was still too loud to stand. I no longer have any noise other that the normal hummm. I dont really know what change stoped the noise, but the changes are listed below.
#1 built new stator using 85 turns two in hand #15 mag wire. (other stator was 75 turns two in hand). both were 5/8 inch thick.
#2 installed 1/8 inch thick rubber between the back of the prop plate, and the front on the outside rotor.
#3 built new tail using 1/2 inch plywood.( The Resin tank would not turn turbine into the wind.)
With the old stator, the turbine output was often over 60 amps at 58 to 62 volts, which would put my tristar controler into fault. The new stator, now holds the turbine under 60 RPM, and puts out from 5 to 20 amps which is fine with me. I never have to worry about the turbine overspeeding.
I think one reason it works so well, is due to the weight of the blades, which weigh 40 lbs a peice. IT does not take much wind to keep them going.
I also opened the air gap to 1-1/8 inch so I should never have to worry about the mags comming in contact with the stator.first picture is of the low rpm high torqe motor that did not work, the weight of the turbine trying to turn, sheared the gears on the motor.
above is what I did to take the place of the motor. It works great, the bolt flange is off a drive axle on a ASB skid steer. The pin that slips into the flange holes is controled by 1/8 Inch cable from the bottom of the tower. the pin is also spring loaded. It will hold the turbine in any position, so I dont have to deal with the turbulance swinging the tower around. You can mabey see the plastic funnel I used to keep the rain off the flange and pin.
above is battery shed. I only have 8 6volt golf cart batterys @ 75 amp hours each.above is a 30 gallon water tank that I have added extra couplings in to install seven 2000 watt elements. This also works very good for my dump load, even if it is wasted.
above is the turbine with all changes made, and I hope will stay that way for years to come. So far, it puts out from 2 to 8 KW hours a day, which Im very happy with!
