In capacitor start induction motor, if the capacitor is replaced with a shorted link, then:

Capacitor start induction run motor

• The capacitor-start induction motor consists of a main or running winding (H) and an auxiliary winding (A). Both the windings have the same number of turns.
• A starting capacitor (Cs) is connected in series with the starting winding as shown in the circuit diagram above.
• The value of the starting capacitor is so chosen that the starting current IA leads the main winding current IH by an angle of 90°.
• As soon as the speed of the motor reaches about 75% of the synchronous speed, then the centrifugal switch isolates the auxiliary winding from the motor circuit. Now, the motor operates as a 1-phase induction motor and continues to accelerate till it reaches the normal speed. 

• In a capacitor start induction motor, the capacitor is essential for creating the necessary phase shift between the start winding and the main winding. This phase shift is crucial to generate a rotating magnetic field and initiate the motor’s rotation.
• Without the capacitor, the phase shift between the windings is lost. The starting winding and the main winding will be in phase, resulting in no starting torque. Since the motor relies on the rotating magnetic field to start, it will fail to start.