In the CSR motor example, which capacitor has the higher capacitance?

In the CSR motor example, which capacitor has the higher capacitance?

• A. Run capacitor (10 µF)
• B. Start capacitor (110 µF)
• C. Both equal
• D. No capacitor

Answer: (B)

In a Capacitor Start-Run (CSR) motor, two capacitors serve different jobs: a large capacitor helps get the motor started, and a smaller one helps it run smoothly. The start capacitor provides a big phase shift to create high starting torque, so it has a much larger capacitance (for example, around 110 µF). Once the motor has started, a switch disconnects this large capacitor, leaving the smaller run capacitor in the circuit to improve running efficiency and power factor. Because of this setup, the capacitor with the higher capacitance is the start capacitor.

In a Capacitor Start-Run (CSR) motor, two capacitors serve different jobs: a large capacitor helps get the motor started, and a smaller one helps it run smoothly. The start capacitor provides a big phase shift to create high starting torque, so it has a much larger capacitance (for example, around 110 µF). Once the motor has started, a switch disconnects this large capacitor, leaving the smaller run capacitor in the circuit to improve running efficiency and power factor. Because of this setup, the capacitor with the higher capacitance is the start capacitor.