The working principle of electric fan motor：
The main components of the electric fan are: AC motor.
The working principle is: the current coil is rotated by force in a magnetic field.
The form of energy conversion is: the electrical energy is mainly converted into mechanical energy, and due to the resistance of the coil, a part of the electrical energy is inevitably converted into internal energy.
Will the electric fan cool down the room when it works? No, the temperature in the room isn't going down, it's going up.
The reason for the temperature rise is that when the electric fan is working, because there is current through the coil of the electric fan, the wire is resistant, so it will inevitably generate heat and release heat to the outside, so the temperature will rise.
But why do people feel so cool? Because there is a lot of sweat on the body surface of the human body, when the electric fan works, the indoor air will flow, so it can promote the rapid evaporation of sweat, combined with "evaporation needs to absorb a lot of heat", so people will feel cool.
2. How to detect the quality of the electric fan motor?
① Check whether the power cable is energized first. If not, replace the power cable. (2) Twist the motor rotor shaft by hand whether it is active, if it cannot be active, it needs to add some lubricating oil; 3. Use a multimeter to measure whether the timer and the gear switch are energized. Some are equipped with a fuse. ④ Use a multimeter to measure whether the introduction of the motor main line and the gear line is connected, if not, need to rewinding or replace the motor; ⑤ Check whether the coil is discolored and burned out. If not, it is necessary to rewind or replace the motor.
Want to know whether capacitance is broken, you can under the condition of the electric fan power, changing the blades (should pay attention to safety, safe to use chopsticks), if we can turn up, capacitance must be broken, you can go to home appliance maintenance department with a same line, if not step by step according to the steps below to check repair it: If the fan does not turn, or the fan turns slowly, change the capacitor to 2.5-3.5uF first. You must be able to read the circuit first. Common is the lack of oil in the shaft sleeve, the rotating shaft is stuck, the starting capacitor is open, the control switch, the outside skin is open, these are the reasons for the fan not to turn.
