Capacitor-start, capacitor-run motors provide

Capacitor-start, capacitor-run motors provide

• A. Low running torque and no starting torque
• B. Medium (or high) running and high starting torque
• C. No starting torque
• D. Low running torque and high starting torque

Answer: (C)

Capacitor-start, capacitor-run motors use two capacitors to shape the currents in the windings, giving the motor both a strong start and solid running performance. The start capacitor provides a large phase shift and high current in the start winding during startup, delivering a high starting torque so the motor can begin turning under load. Once speed is up, a switch removes the start capacitor, and the run capacitor stays in the circuit with the run winding to maintain a favorable phase angle. This keeps the motor running efficiently and with good running torque. So these motors do have significant starting torque and good running torque, not no starting torque.

Capacitor-start, capacitor-run motors use two capacitors to shape the currents in the windings, giving the motor both a strong start and solid running performance. The start capacitor provides a large phase shift and high current in the start winding during startup, delivering a high starting torque so the motor can begin turning under load. Once speed is up, a switch removes the start capacitor, and the run capacitor stays in the circuit with the run winding to maintain a favorable phase angle. This keeps the motor running efficiently and with good running torque. So these motors do have significant starting torque and good running torque, not no starting torque.