How to repair the broken electric fan?

Common faults of electric fans and their solutions. The main reasons why the motor does not turn are: open winding, lack of oil, shaft locking, abnormal capacitance and so on. From the maintenance practice of electric fans, the latter two kinds of faults are mostly. For non-rotating electric fans, my maintenance steps are: plug measurement, rotating motor, capacitance measurement and reprocessing. The first step is to measure the operation and speed regulating winding of the electric fan. Start the timer of the electric fan first. The timer is normal when you hear the click. If there is no tick, the timer is broken. If there is no resistance value, the motor winding may be burnt out. For the motor with thermal fuse in series, it may be that the thermal fuse is open. Take the motor apart and have a look. If it is only an open circuit, the short circuit of the thermal fuse can return to normal. All gear switches are damaged, but it is unlikely. Step 2: Check whether the shaft is locked, remove the cover of the electric fan and turn the motor shaft by hand. If it can't turn, it means that the motor is seriously locked. When disassembling the motor, first remove the oil stain and rust on the front and rear shaft sleeves and the motor shaft, and then fill the linoleum of the front and rear shaft sleeves with sewing machine oil. Most electric fans can troubleshoot. Step 3: Measure the starting capacitance. If the motor shaft rotates flexibly, it is necessary to measure the starting capacitance of the electric fan motor. Firstly, use multimeter R×100Ω to measure the resistance values at both ends of the starting capacitor of the motor and the resistance values of the running, starting and speed regulating windings of the whole electric fan motor, that is, the resistance values of the black and yellow leads. Maintenance of the active electric fan As for the electric fan driven by the motor, I have put it in place in one step according to the actual situation. Rather than performing maintenance step by step as described above. If the user says, the electric fan turns slowly first, and then gradually becomes faster. According to experience, the motor will generally hold the shaft slightly. The reason is that the electric fan is inherently short of lubricating oil. Disassemble the electric fan motor directly and add enough sewing machine oil to the linoleum of the front and rear shaft sleeves, which can generally be repaired.