You can test it with a multimeter. First, set it to the ohm gear, and then take out all five wires in the motor. Then connect any line to the red pen and connect the black pen to the gear marked 1. It's time to record its resistance. Then, detect the resistance values of the 2nd and 3rd gears and mark them uniformly. Finally, compare the recorded resistance values. If they are all big, or one of the gears is big, it means that the motor has burned out.
Of course, in addition to this method, we can also judge by observing the motor junction box. If you open it, you can smell the obvious burning smell, and you can also see some black carbon attached to the enameled wire in the box, then the motor must be burnt out.
Common faults of electric fans
1, the speed is slow, and the wind becomes smaller. This is because the internal shaft lacks lubricant and it is difficult to rotate. It is relatively simple to deal with such a fault, that is, directly turn off the power supply, then disassemble the electric fan net cover and drop some lubricating oil on the fan blade shaft. Try not to use lubricating oil. Lubricating oil will corrode the surface of the motor and rust easily after a long time.
2. The motor is overheated. The motor in the electric fan will overheat if it runs for a long time. Once it is overheated, it is easy to lose power and cannot turn. At this time, the electric fan can only be used after the motor temperature drops. It is best not to run for a long time. It is best to let the electric fan have a rest when using.
3, the capacitance becomes smaller, the electric fan will become smaller and smaller after long-term use, resulting in the motor can not be started. This situation is not suitable for continuous use, so as to avoid the danger of short circuit.