1. Generally, three blades are used, and the angle of 15 degrees is most suitable. 2. The bottom can be fixed with screws by drilling holes. 3. To make a generator, you first need silicon steel sheets, copper wire, and magnets. You can use a discarded small motor casing as a casing. Embed the steel wire in the silicon steel sheet and wrap it (generally 25-30 turns per sheet is enough) and put it on the rotor. Fan blades are added to the rotor head. Driven by the fan blades, the rotor and stator of the generator cut the magnetic field lines, thus generating electrical energy. thereby driving the LED.
Wind turbines are actually composed of two parts, one is the wind turbine (blade), and the other is the generator. The generator is no different from an ordinary generator. A generator is mainly composed of a rotor and a stator. Generally, the rotor of a generator is mainly the main shaft and the wire windings on the shaft, which are rotating parts; the stator is mainly composed of magnets and casing, which are stationary parts. The so-called external rotor motor is just the opposite. The magnet and casing rotate, but the main shaft does not rotate. From the principle of power generation, as long as there is relative movement between the wire and the magnet, the wire will cut the magnetic lines of force and generate current. Therefore, whether the main shaft drives the wire to rotate or the shell drives the magnet to rotate, it can generate electricity. However, due to the large rotation radius of the casing, large generators generally do not use external rotors.
The principle of the wind turbine is: the wind blows the blades, and the blades rotate. The wind turbine shaft and the generator main shaft are connected together to drive the generator main shaft to rotate, and the outer casing is fixed. This is the commonly used inner rotor wind power. Generator; if the wind turbine shaft is connected to the generator casing, it will drive the generator casing to rotate. At this time, the main shaft of the generator must be fixed and not rotate. This is an external rotor wind turbine. The ceiling fan mentioned upstairs is indeed a good example. The motor of the ceiling fan is an external rotor motor, and the structure of the motor and the generator are very similar, but the working principles are exactly opposite. The working principles of the blades of the ceiling fan and the blades of the wind turbine are also exactly opposite. , so the ceiling fan can also be regarded as an external rotor wind turbine with the opposite working principle.