Solutions to follow if the hood motor burns out: 1. First look at the appearance of the capacitor. If there are signs of burnt marks on the appearance, it means the capacitor is broken. Replace it. with a new capacitor of the same model and the fault can be eliminated, the small capacitance of the capacitor cannot be seen from the appearance. You can only directly replace a new capacitor of the same model to determine whether the capacitor capacity. it's too small.
2. If the hood motor rotor is greasy, this will also prevent the motor from running normally, causing the motor to overheat and possibly burn. You can gently turn the motor fan blades with your hands. If the fan blades rotate very slowly, it means that the lubrication is not good. You can open the motor, drop some lubricating oil on the rotating shaft, then doturn the engine on. motor fan blades a few more times until the motor bearings until it spins very fast.
18.5 fan blades are rotten
The possibility of the laptop fan generating electricity in reverse and burning the card mother is extremely weak.
Principle:
The operating principle of a generator is to use the relative movement between a magnetic field and a conductor to generate electric current . The blades of a laptop fan generate a magnetic field when they rotate, but because the blades are thin and rotate at low speeds, the magnetic field generated is very weak.
Reverse Power Generation:
When the fan rotates in the opposite direction, the direction of the magnetic field also reverses. If the fan speed is high enough, the magnetic field reversescan induce a low current in the fan coil. However, laptop fan speeds are typically much lower than the critical speed required to generate electricity.
Burning the motherboard:
Even if the fan generates current in reverse, the current intensity is very small and not enough to damage the motherboard. motherboard. The motherboard's capacitors and inductors have high voltage resistance and can withstand voltages much higher than those generated by the fan's reverse power generation.
Blow the fan with a hairdryer:
Use a hairdryer to blow the fan of a laptop that is not powered will not burn the motherboard. The pressure and wind speed generated by the hair dryer are much lower than the critical reverse power generation value of the fanof the laptop.
Conclusion:
In summary, the possibility of the laptop fan generating electricity in reverse and burning the motherboard is extremely weak. Even if the fan generates electricity in reverse and generates a small current, it will not damage the motherboard. Therefore, using a cooling base with strong air pressure will not damage the laptop.
The reasons for the rotten blades of the 18.5 fan are as follows:
1. The rotor is unbalanced, the rotor vibrates, etc. In severe cases, a wheel overspeed accident may even occur.
2. Engine failure. Overcurrent, etc., may burn out the motor in severe cases.
3. Blade wear. With years of fan use, blade wear will gradually increase. To ensure the safety of the fan during use, the blades must bere replaced on time.