How does start capacitor help start motor permanent split capacitor motors or psc motors use run capacitors to help the motor be more efficient while running the start capacitor gives the motor a boost on startup the run capacitor helps the motor run more efficiently. The function of the motor start capacitor remains the same as in the previous case it gets disconnected from the circuit after the rotor reaches a predetermined speed by means of a centrifugal switch after that point the auxiliary winding remains powered through a motor run capacitor the figure below describes this type of design. Click here to view a capacitor start motor circuit diagram for starting a single phase motor also read about the speed torque characteristics of these motors along with its different types learn how a capacitor start induction run motor is capable of producing twice as much torque of a split phase motor. Whats the difference between a start capacitor and a run capacitor can you use them interchangeably see why these two types of capacitors cannot always be substituted for one another
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