Running Capacitor

The capacitor start motor is the most widely used among various types of single phase motors. Connecting a capacitor in series with the starting winding achieves the starting torque with a lower starting current leading to a torque that is higher than other types of single phase motors like the shaded pole type. Thus, for machines which have a heavy starting duty, these capacitors are ideal. A capacitor – start motor comes with a centrifugal switch which automatically disconnects the auxiliary winding when motor attains a pre – determined speed. Hence, it works only with the help of the main winding. A capacitor connected to a motor develops a higher voltage across it than that applied to the motor. Hence, designing the Motor start capacitor is more important.