SOLUTION

A two-value capacitor-run motor starts with a High capacitor and runs with a Low capacitor.

Capacitor start capacitor run motors

• This type of motor is designed to operate with the start winding and it is a series capacitor permanently connected to the supply.
• lt has two capacitors connected in parallel in the start winding circuit for starting purposes.
• A start capacitor stays in the circuit long enough to rapidly bring the motor up to a predetermined speed, which is usually about 75% of the full speed, and is then taken out of the circuit, often by a centrifugal switch that releases at that speed.
• In a capacitor start and run the motor the function of the running capacitor in series with the auxiliary winding is to Improve power factor.
• Run capacitors are designed for continuous duty while the motor is powered, which is why electrolytic capacitors are avoided.
• As a result, this motor has a higher starting torque as well as a higher efficiency. These motors are employed in sizes ranging from 375 W to 7.5 kW.  The power factor of these motors is upto 80% to 100%.

Note:-

• Inductive Loads consume Reactive Power and Capacitive Loads deliver Reactive Power.
• The Power Factor Angle is inversely proportional to the Power Factor (reducing the angled gap between the Voltage vector and the Current Vector improved power factor).
• So in a single-phase Induction Motor, a Capacitor Bank is connected, then the Reactive power demand by the Inductive load (Induction Motor) is supplied by the Capacitor Bank, not from the Source.
• Therefore the system reactive power demand is reduced and the Power factor is improved.