Dingfeng Capacitor - - Connection method and starting method of single-phase motor starting capacitor

Mar 9,2020

The starting of the motor requires a certain accessory, which is the capacitor. Without the starting capacitor, the motor cannot start normally.


The so-called single-phase motor generally refers to a low-power single-phase asynchronous motor powered by a single-phase AC power supply.

There are two types of capacitor connection. The first is that the starting capacitor of a single-phase motor is not connected to a centrifugal switch in the starting circuit. The starting winding and the capacitor not only function at startup, but also function during operation. This can improve the power factor and efficiency of the motor. Therefore, the running performance of this motor is better than that of a capacitor starter motor.

The other is to connect a centrifugal switch in the starting circuit. This connection method is generally used in places with large and unstable loads such as air compressors, cutting machines, and woodworking machines.

There are two ways to start capacitors for single-phase motors. First of all, the first type is a split-phase starting type, which is started by an auxiliary starting winding, and its starting torque is not large. The running rate remains approximately constant. Mainly used in electric fans, washing machines and other motors. The second type is that the centrifugal switch is turned on when the motor is stationary. The starting capacitor participates in starting work after power is supplied. When the rotor speed reaches 70% to 80% of the rated value, the centrifugal switch will automatically open and the starting capacitor completes the task. And was disconnected. The starting winding does not participate in the operation, and the motor continues to operate with the operating winding coil.


After understanding these, presumably everyone also knows how to connect and start. I want to remind everyone here, especially in connection with the law, that it cannot be ignored. This is a vital link and must be paid more attention.



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