Let me tell you, new chargers are always silent when you buy them. The longer they are used, the louder the sounds will be! Why?
The principle of the charger is this: there is a small motor inside with a fan blade. When it rotates, the wind blows to the heat sink to cool the heat sink, which is equivalent to blowing air from the outside in.
, over time, it is easy to bring dirt from the outside to the fan blades, all of which accumulates on the fan blades and the rotating shaft. Too much accumulation will cause the fan blades to collide with the shell or parts, and the blades may become loose. In addition, the rotating shaft is dry and not lubricated, resulting in Brought noise. The solution is to disassemble the charger, clean the dirt on the fan blades, inject lubricating oil into the rotating shaft and it will become silent again. If this does not work and there is still noise, then the fan blades are loose. Simply go to the electronics market to get one. All you need is a motor. These motors with fan blades are sold in computer markets and electronics markets for 10 to 15 yuan each.
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.