Capacitor Start Motors are single-phase Induction Motors that employ a capacitor in the auxiliary winding circuit to produce a greater phase difference between the current in the main and the auxiliary windings. The name capacitor starts itself shows that the motor uses a capacitor for the purpose of starting.
How does a capacitor start motor?
With a capacitor connected in series to the secondary winding, the magnetic field it produces lags behind the magnetic field generated by the primary winding. This difference in phases creates a starting torque and the motor starts to rotate. Capacitors that allow a motor to start rotating are called start capacitors.
Can a motor run without a capacitor?
Answer: There are three common types of single-phase motors named capacitor motor, shaded pole motor and split phase motors. Shaded pole and split phase single-phase motors do not require a capacitor to run.
What’s the difference between a run capacitor and a start capacitor?
Run capacitors are designed for continuous duty, and are energized the entire time the motor is running. Single phase electric motors need a capacitor to energize a second phase winding. … Start capacitors increase motor starting torque and allow a motor to be cycled on and off rapidly.
Can I use a run capacitor in place of a start capacitor?
The capacitance and voltage ratings would have to match the original start capacitor specification. A start capacitor can never be used as a run capacitor, because it cannot not handle current continuously.
How do you wire a start and run capacitor on an AC motor?
How to Wire Up a Start Capacitor
- Turn off the electricity to the unit the motor operates. …
- Inspect the start capacitor’s wiring diagram. …
- Push the wire terminal on the start capacitor relay’s “Common” wire, usually the black wire, to the common terminal on the load side of the unit’s contactor.
Do you need a start capacitor?
Without a start capacitor, your AC will not start up at all, as it is the start capacitor that provides the initial energy needed for start-up. A lot of torque is necessary to start up an AC system, so a start capacitor will have greater capacitance than a run capacitor.