Maintenance of fan motor with synchronous motor not rotating
The main reasons for the motor not rotating are: winding open circuit, lack of oil to hold the shaft, abnormal capacitor, etc. Judging from the maintenance practice of electric fans, the latter two faults are mostly. For non-rotating electric fans, my maintenance steps are to measure the plug, rotate the motor, measure the capacitance, and then deal with it. The first step is to measure the operation of the electric fan and the speed regulating winding. Rotate the electric fan timer first. When you hear a click, the timer is normal. If there is no click, the timer is damaged. If there is no resistance value, it may be that the motor windings have been burnt and broken. For a motor with a thermal fuse, the thermal fuse may be an open circuit. You should also disassemble the motor and take a look. If it is only an open circuit, short-circuit the thermal fuse to return to normal. The gear switches are all damaged, but the possibility is unlikely. The second step is to check whether it is holding the shaft, disassemble the electric fan guard, and rotate the motor shaft by hand. Disassemble the motor, first remove the oil and rust on the front and rear bushings and the motor shaft, and then add enough sewing machine oil to the linoleum of the front and rear bushings. Most electric fans can be trouble-free. The third step is to measure the starting capacitance. If the motor shaft rotates flexibly, it is necessary to measure the starting capacitance of the electric fan motor. First of all, use a multimeter to measure the R×100Ω range of the motor starting capacitor, the resistance value of the entire electric fan motor running, starting and speed regulation winding, that is, the resistance value of the black and ** leads. Maintenance of active electric fans For electric fans with active motors, I can do it in one step based on the actual situation. Rather than performing maintenance step by step as described above. If the user says, the electric fan rotates slowly first, and then gradually becomes faster. According to experience, the motor is generally holding the shaft slightly. The reason is that the electric fan lubricating oil is missing in the initial stage. Disassemble the electric fan motor directly, add enough sewing machine oil to the linoleum of the front and rear bushings, and it can usually be repaired. Remote control electric fan, turn on the troubleshooting when power is on. The current remote control electric fan control actuators are basically thyristors. It can be seen from the principle that the thyristor is essentially equivalent to the switch thyristor breakdown is equivalent to the switch being turned on. Of course the electric fan will turn when the power is turned on. For example, when a floor-standing remote control electric fan is in use, the remote control functions are basically normal, but the electric fan is not unplugged after the electric fan is turned off. The electric fan has a clear sense of vibration and the electric fan makes a buzzing sound, especially at night. Look at the electric fan blades. It is also turning slowly. Because the control functions are basically normal, the MCU is normal, and it can be seen from the above principles that the SCR is faulty.
Fan motor with synchronous motor
Fan motor with synchronous motor