1. Go to the electronics market and buy a small motor for model aircraft. It is a DC motor with a built-in permanent magnet and powered by a rechargeable battery or storage battery. The motor shaft should be slightly longer.
2. Make your own windmill. The windmill shaft should be made of plastic or wood and bonded with the motor shaft to ensure that there will be no slippage between the motor shaft and the windmill shaft when the windmill rotates.
3. The two terminals of the motor wiring are connected to the small lamp beads. You can see that when the fan rotates, the lamp beads will glow slightly.
If you want a larger one, one needs a larger motor, preferably with a brush and commutator, and the other needs a windmill strong enough to withstand greater wind force and drive the motor shaft. Making a wind turbine using a doubly-fed motor requires two power supply systems for the rotor and stator, which is quite complicated and is not recommended.
The operating principle is that the operation of the generator and motor of the DC motor is reversible. Especially after the permanent magnet is built into the stator, no special excitation winding is required, which can greatly simplify the design.
How to make a home-made wind turbine, and how much does it cost?
Long strip power generator. The shape of the wind leaf power generator is a long strip, which is very easy to carry and install on an electric bicycle. The wind leaf power generator does not require sunlight. When the blades are unfolded in a windy place, it can generate electricity and store the electricity on its own. It has a lithium battery that can be connected to charge electrical equipment after folding the blades.
A DC generator, a rotating impeller, a pole to stand the fan on, a length of wire, an inverter to convert the DC power into AC, a battery, and excess power. The cost of storing it will not be very low, and there is no guarantee of reliability if you make it yourself. This is related to your craftsmanship. If it is for fun, you can try it. If it is for use, then buy it ready-made