I bought a small generator on Taobao to make a wind generator, but the magnetic resistance is a bit

I am engaged in wind power. The main reason is not that you have a large magnetic resistance, but that you have chosen a larger motor. According to the wind energy formula

Theoretically the generator power = 0.593*0.5pAv^3* c

Wind energy conversion limit efficiency: 0.593

p: air density

A: swept area

v: wind speed

The ultimate efficiency of our large-scale wind turbines is only about 0.43.

But if you make this blade, it looks lower in the picture. Now even if your conversion efficiency is the highest, then calculate back that you are at 6 meters The wind power is 28 watts, that is, it is only 174 watts in the wind of 11 meters. You can find the wind of 11 meters on the ground, so in the wind of 6 or 7 meters, you can't even blow the windmill, you can only increase the blades. Only the area can be solved