The Variable Pitch axle is by far the most advanced system used for wind turbines. The blades are shaped at such an angle that as the wind blows harder, the blades actually turn slower! Ideal for gusty and coastal areas.
The Variable Pitch Principle. Under the wind speed of 0m/s ~ 3m/s, the turbine blade remain static, and the angle X1 formed between the blade and turbine plane is B° (X1= B°); under this angle, the blade is most easily started up. As long as the wind speed reached 3m/s, the blades will begin to rotate. During the rotation, the outermost edge of the blade will be driven by the centrifugal force generated by the rotation of the blade to tilt toward the turbine plane, the aforementioned angle X1 will decrease until 0° when the blade is in parallel with the turbine plane; and at this angle, the turbine has nearly reached it’s rated output power. When the wind speed is between 11m/s ~25m/s, the blade will keep adjusting it’s position forth and backward slightly to let the angle X1 fluctuate a little bit but maintain at around 0°roughly, so as to stabilize it’s rated power. Within the wind speed of 25m/s ~ 50m/s, when the wind has exceeded it’s rated speed, the wind will keep drawing the blade by the centrifugal force, so the angle X1 will continue to decrease and turn into a negative angle X1= - B° (PS: B°and - B°is not the same). Under this negative angle, the rotation of blade will produce a resistance on the rotation of the turbine blade to slow down the rotation and protect the wind turbine from over speed operation, and the maximum RPM of the turbine will be no more than 277 RPM. See above picture (A, B, C:3 Pcs Blades and a,b,c:3 PCS centrifugal hammers)
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