The electric fan does not turn at low speed.

Low-speed starting electric fan is equivalent to low-voltage starting electric fan. If the power supply voltage is low when starting, it is more difficult to start. When the low-grade switch is pressed, the power supply is turned on but the fan does not turn, the power supply should be turned off immediately or the high-grade switch should be pressed first, and then the low-grade switch should be pressed after the fan starts, so as not to burn out the fan motor. When the fan does not turn because the low speed switch is pressed, the fan is actually locked. Although the low-speed voltage is not high, the current in the stator winding is quite large, the blades do not turn, and the motor is poorly cooled, which may burn the motor for a long time. Therefore, in the national standard of electric fans, low-voltage and low-speed start-up in the state of shaking the head is regarded as the safety performance index of electric fans. There are many factors that can't start the electric fan at low voltage. In addition to the low power supply voltage, the damaged or insufficient capacitance is also one of the reasons why the electric fan can't be started at low voltage. From the manufacturing point of view, the poor manufacturing accuracy of parts, different stator and rotor, and bearing clamping belt increase the rental force when the electric fan is started; From the electrical point of view, the starting force is not enough due to the short circuit between the main combustion button and the ignition button or the broken rotor cast aluminum. , you can choose the low speed of the electric fan and can't start it. Second, in view of the above problems, different methods are applied to repair for different reasons. Such as changing the container, adjusting the air gap between stator and rotor, adjusting the concentricity of bearing, replacing stator or new rotor, etc. Low-speed starting electric fan is equivalent to low-voltage starting electric fan. If the power supply voltage is low at startup, ......