Common applications of single phase induction motor

A single-phase motor has no revolving field at standstill and therefore develops no locked-rotor torque.

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In general, three-phase electric motors have higher efficiency and power factors and are more reliable since they do not have starting switches or capacitors.

In those instances in which three-phase electric motors are not available or cannot be used because of the power supply, the following types of single-phase motors are recommended for industrial and commercial applications: (1) capacitor-start motor, (2) two-value capacitor motor, and (3) permanent split capacitor motor.

When there will be phase difference, the rotor will generate a starting torque and it will start to rotate.

Practically we can see that the fan does not rotate when the capacitor is disconnected from the motor but if we rotate with hand it will start to rotate.

For example we see that when we put on the switch the fan starts to rotate automatically, so it is self starting. So the rotating magnetic field is having the same phase difference which will make the rotor to move.

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