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What is the role of a capacitor connected in series with the auxiliary winding in Permanent Split Capacitor (PSC)┬а 1-╬ж Induction Motor?
Produce Starting torque & Improve running power factor
Increase motor capacity
Reduce fluctuations in torque
Decrease voltage fluctuation
Produce Starting torque & Improve running power factor
Quick Trick: Remember PSC motor features: Permanent capacitor in series with auxiliary winding provides phase split for continuous starting torque AND stays connected during running to improve power factor.
Remember PSC motor features: Permanent capacitor in series with auxiliary winding provides phase split for continuous starting torque AND stays connected during running to improve power factor.
Analyze the Phase-Split Role at Starting
A single-phase induction motor produces no revolving magnetic field on its own. Connecting a capacitor in series with the auxiliary winding splits the single-phase supply into a two-phase system by creating a 90-degree phase difference, generating the required starting torque.
Analyze the Continuous Running Role
In a Permanent Split Capacitor (PSC) motor, the capacitor is permanently connected in the circuit (no centrifugal switch). Because it stays active during normal operation, it counteracts inductive reactance, significantly improving the running power factor.
B: Option B is wrong because a capacitor alters phase and power factor, not the inherent mechanical capacity rating of the motor. C: Option C is wrong because torque ripple reduction is a byproduct of a smoother rotating field, not the primary designed role. D: Option D is wrong because capacitors in motor windings do not regulate supply voltage fluctuations.
A is correct because the series capacitor produces a two-phase rotating magnetic field for starting torque and remains in the circuit during operation to maintain a high power factor.
Watch for the motor type: Capacitor Start motors disconnect the capacitor after starting (starting torque only), whereas Permanent Split Capacitor (PSC) motors keep it connected continuously (starting torque + improved power factor).