Question
Download Solution PDFIn a capacitor start induction run motor, when motor reaches to ________ of full speed, the centrifugal switch S opens and cuts out capacitor from supply.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFCapacitor 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.
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