SOLUTION

The capacitor-start capacitor-run motor is also called the two-value capacitor motor. In this motor, the high-starting torque of the capacitor-start motor is combined with the good running performance of the capacitor-run motor.

Motor Capacitors

Start and Run Capacitors:- The two capacitors encountered with single-phase AC induction motors, the start and run capacitors, are different from one another and are not interchangeable.

Start capacitors are usually large microfarad (100 µF to 1,000 µF) AC electrolytic and are designed to be in the energized circuit for only a short period of time.

Run Capacitors:–

• Motor run capacitors are non-polarized and are much larger physically for a much smaller µF capacitance.
• Run capacitors do not depend on a chemical reaction to achieve their capacitance, so they can be across the AC power supply line indefinitely.
• Run capacitors are usually small microfarad (5 µF to 50 µF) made up of expensive oil or pyranol-insulated foil paper capacitor and are designed to be in the energized circuit for extended periods of time.
• Run capacitors are designed for continuous duty while the motor is powered, which is why electrolytic capacitors are avoided.