Electrician Red Seal · Question
What is the primary function of the starting capacitor in a single-phase capacitor-start induction motor?
The starting capacitor is connected in series with the start winding to create a phase difference (approximately 90 degrees) between the current in the start wi
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Question: What is the primary function of the starting capacitor in a single-phase capacitor-start induction motor?
Answer options: ✅ To create a phase shift in the current for the start winding, providing starting torque.
- To improve the power factor of the motor during operation.
- To reduce the inrush current during motor startup.
- To provide a continuous boost to the motor's running torque.
Correct answer: To create a phase shift in the current for the start winding, providing starting torque.
Explanation: The starting capacitor is connected in series with the start winding to create a phase difference (approximately 90 degrees) between the current in the start winding and the current in the main (run) winding. This phase shift creates a rotating magnetic field necessary to produce the initial torque to start the motor. Power factor correction is typically done by running capacitors or external capacitors, not start capacitors. Inrush current reduction is a function of soft starters or variable frequency drives. Continuous torque boost is not its primary function.
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