The design of the blades is based on the speed of the motor.
First determine the speed and power of the generator, and then the size of the blades will be determined.
There is a formula for wind power generation: P=?ρ*π*R?*V?*Cp
ρ——air density;
V—— Wind speed;
Cp - wind energy utilization coefficient;
If it is the same generator and you make blades of different sizes, of course, theoretically, the generator with a larger blade area can run at the same wind speed Turn faster, because the output power P is larger at this time, as you can see from the above formula.
π*R? Here R is the radius of the blade sweep area.
The premise is that you are using the same motor.
Of course, bigger blades are not always better, as overspeeding the motor will cause heat and damage.
The rated wind speed is related to the sweep area of the impeller and the torque of the generator. It is generally determined based on algorithms and simulation software, and then a prototype is made based on the theoretical value. Generally speaking, the rated power of the generator As long as the impeller diameter remains unchanged, the larger the impeller diameter, the lower the rated wind speed, which means that the sweep area is larger, and the smaller wind speed can allow the generator to reach full power