running capacitor,No matter what kind of capacitor, it has a starting effect at the beginning of the motor. When the motor reaches about 75% of the rated speed, the starting capacitor is automatically disconnected by the centrifugal switch, and the running capacitors continues to work with the motor.
The process of starting the motor is actually the process of “phase out”. Because single-phase motors are different from three-phase motors, there is no phase difference and no rotating magnetic field can be generated. The function of the capacitor is to make the starting winding current of the motor lead the running winding 90 electrical angles in time and space, forming a phase difference. Among them, the run capacitors also plays a role in balancing the current between the primary and secondary windings.
Since the starting capacitor works for an instant and short time, the withstand voltage must be above 250V, while the running capacitors must work for a long time, and the withstand voltage must be above 400V.
The starting capacitor is to make the starting coil of a single motor energized when starting, and cut off after starting.
The run capacitors allows the motor to perform capacitance compensation during operation, so the starting capacitor cannot be less, and the run capacitors can be omitted.