What is the reason why the cooling fan in the air purifier doesn't work?

The cooling fan installed in the air purifier does not turn when it is rotating. What's the matter? There are only two cases, namely, the quality of the fan itself, or the anti-impact ability is not enough
For example, the power design is too large, and the temperature keeps rising for a long time. Finally, the machine burns out. For example, the voltage of the purifier is a little higher than the rated voltage of the cooling fan, which causes the cooling fan chip to burn out. Normally, the range of the working voltage of the cooling fan should ensure that there is no problem in floating up and down+/- 10% of the rated voltage
The second is the interference of static voltage on the cooling fan. It is also very common for the static voltage in the air purifier to reach tens of thousands of volts. Just watch the fan turn and stop turning. When it is powered on again, it will not turn. This is basically because the chip of the cooling fan is damaged.