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

The Computer fan installed in the air purifier will not rotate when it rotates. What is the matter? There are only two cases, namely, the quality of the fan itself, or the anti strike ability is insufficient
For example, the power design is too large, the temperature keeps rising for a long time, and finally the machine burns. For example, the voltage of the purifier is a little higher than the rated voltage of the Computer fan, which causes the Computer fan chip to burn. Normally, the operating voltage range of the Computer fan should be guaranteed to fluctuate at+/-10% of the rated voltage
The second is the most easily ignored one. The interference of static voltage on Computer fan is also common. It is also common for the static voltage in the air purifier to reach tens of thousands of volts. Just watch the fan turn and it will not turn. Power on again and move it, but it will not turn up. Basically, the chip of the Computer fan is damaged.