Ac Motor Capacitor Explained:
A capacitor is a device that stores electricity. It can be large or small depending on the application. In the case of a motor, a capacitor is used to start or power up an AC induction motor.
What Types Need Capacitors?
There are two main types of capacitors for AC single-phase motors: a start capacitor and a run capacitor. A start capacitor is responsible for increasing the starting torque of an AC motor, which in turn cycles the motor on and off rapidly. It stays in the circuit long enough for the motor to reach a determined speed (typically 75% of full power), and then it's taken out of the circuit by a centrifugal switch.
Typically, start capacitors have voltage ratings of 125 V, 165 V, 250 V and 330 V and can have a resistor across the terminals to bleed off any stored charge. Replace them with new capacitors that have the same or higher voltage rating as the original capacitor.
Why Are Motor Capacitors Important?
Capacitors help to regulate the flow of electricity and smooth out peaks in the voltage, current and frequency. In addition, they are energy-saving devices. As a result, they reduce power consumption and improve the overall efficiency of an AC single-phase motor.