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Forum Index : Windmills : F&P smart drive expectations
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| chriso38 Newbie  Joined: 16/05/2011 Location: AustraliaPosts: 2 |
Hi from central queensland, im a newbe here, and im going to have a go at wireing a smart drive i have ( 0.8mm wire size, 42 pole) in 7X2C charging 12v batteries. My wind speed can be anywhere between 12KPH to 30KPH, can anyone tell me what this smart drive would produce in these wind speeds in amps? Im aware that blade diamention and blade config come into play, i plan to mount it on a mini southern cross wind mill type fan, i think its a 6FT fan. just thought id post this to see what others are getting out of their 7x2c wired smart drives. cheers....... |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
Hi Chris, welcome to the site. A 7X2C isn't going to work at all well on a fan type turbine, like the farm windmill turbine your talking about. The fan type are designed for torque, and run at a very low RPM, maybe 150 RPM max in a gale. They do appear to be spinning faster, but its an illusion caused by the number of blades. The 7X2C suits a 3 blade high speed turbine, like those you see on wind farm wind turbines. For a 6 foot 3 blade, it would run at 300 plus RPM in a good wind, perfect for the 7X2C. If you do use the farm windmill turbine directly to the F&P, it will only put out 6 or so volts, too low to charge a battery. So, what are your options. You could gear up the RPM, using a gearbox or chain or belt? The fan turbine has a lot of torque, and would drive the F&P through a 1:3 or 1:4 ratio, spinning it up to 200 to 300 rpm. Or, if you havn't rewired the stator yet, leave it as it is from factory. In a 1:1 ratio with the turbine, it would reach charging voltage easily, but current is limited to a few amps, 3 to 4 at most, about 50 watts max. Even if you go for the geared up RPM, dont expect much over 50 watts. The fan turbine is designed for torque, to lift a heavy column of water, and not for speed, which is what a electricity producing turbine needs. But still, 50 watts is better than no watts, so if you still want to use the fan turbine, go ahead, it will be a fun project. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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imsmooth Senior Member  Joined: 07/02/2008 Location: United StatesPosts: 214 |
This is what you can expect with neo magnets for a F&P neo power curve There is a whole tutorial at wind turbine tutorial I hope this helps |
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