Motor starting

There are three types

1-Capacitor Run Motors:

The capacitor run motor design is very similar to the capacitor start motor. A capacitor run motor has the staring winding and the capacitor in series at all times. Because the capacitor remains in the cricut at all times, a lower value of capacitor is used. The capacitor run motor has a higher runing torque than a capacitor start motor. In a capacitor run motor the capacitor remains in the cicuit while the motor is running.

2-Capacitor-start Motors:

The capacitor start motor is essentially the same as a split phase motor where the two windings are out of phase with each other, providing the necessary torque for starting the motor to rotate. The addition of the capacitor in series with the start winding adds to the initial torque and cause the current in that winding to lead the running winding phase voltage, obtaining a greater angle of displacement between the starting and running windings. In a capacitor start motor, the starting winding and the capacitor are disconnected by the centrifugal switch.

3-Capacitor Start and run motors

Capacitor start and run motors combine the advantage of the capacitor start motor which has high starting torque with that of the capacitor run motor which has high running torque. The capacitor start and run motor starts with a high value and a low value capacitor connected in parallel with each other but in series with the starting winding. This provides a very high starting torque. The centrifugal switch disconnects the high value capacitor at 80 percent speed but the lower value capacitor remains in the circuit. In a capacitor start and run motor the starting capacitor is disconnected when the motor reaches speed but the running capacitor remains in the circuit.