There are many reasons why electric fans are slow and weakThe most typical reason is that after a long time, the capacity of the starting capacitor becomes smaller, resulting in a smaller starting torque, resulting in the slow speed of the electric fan and weak starting. The solution is to replace the capacitors.
However, it must be noted that the starting capacitor has a nominal value (generally the capacitance of the electric fan is 5uf, and the larger one is 10uf), and the nominal value of the replacement capacitor must be the same, otherwise the motor will be damaged.
In addition, there are some reasons that can cause the fan to rotate slowly, such as too low voltage: when the supply voltage is lower than the normal voltage, the current will become smaller, resulting in insufficient magnetic force, which makes the fan unable to rotate. In this case, check the line to adjust the voltage to the normal voltage.
It is also possible that the motor shaft is slightly jammed or defective: the motor shaft is rusty and causes a slight jam that causes the fan to rotate smoothly, which makes the fan slow and weak. In this case, lubricate the motor with oil, which can generally be solved, if it cannot be solved, then the only way is to replace the motor directly. (If it is forcibly repaired, the cost can buy a new one).
Another example is that the fan overheats and exceeds the high load: when the fan overheats and exceeds the high load, it will lead to poor conductivity, which will make the fan slow and weak. In this case, stop the machine, dissipate heat, and check whether the working environment of the electric fan is normal.
For example, if the protective device is overheated or there is a short circuit, or the line is in poor contact, if you don't know much, you must find a professional to overhaul it.