... to Variable Pitch in different wind speed by wind turbine1. Under the wind speed of 0m/s ~ 3m/s, the turbine blade remain static, and ... 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 ... blade to slow down the rotation and protect the wind turbine from over speed operation, the maximum RPM of the turbine will be no ...