Why does the Xiaomi Smart Standing Air Circulation Fan make an electric current sound when it is running?

The motor will make a slight electric current sound when working, which can only be heard when close to the motor. This is a normal phenomenon. If the sound is obvious, please check whether there is any foreign matter inside the fan, remove the Fan Blade, and check whether the abnormal sound comes from the motor or the fan body. If the abnormal sound still occurs after removing the blade, the motor needs to be replaced.
Note:
1. Check whether the socket and power cord are properly connected and ensure that the voltage is stable. If there is a problem with the power supply, try changing a socket or using a voltage stabilizer;
2. Check whether the motor is overheated due to long-term operation, causing frequent internal current adjustments. Shut down the device and cool for a while, and then restart it;
3. If the problem still exists, please apply for after-sales inspection.