Why the single phase induction motor continue to run even the capacitor switch is turned off?

Once motor starts rotating, it will continue to rotate under influence of main field, even if starting winding is cut off. There will be a net torque in the same direction of initial rotation. As a result the loop will keep on rotating in the same direction. This is the way a single phase induction motor works.

What is the principle of the rotation of single phase induction motor?

Starting Principle A single phase induction motor consists of a single phase winding on the stator and a cage winding on the rotor. When a 1 phase supply is connected to the stator winding, a pulsating magnetic field is produced. In the pulsating field, the rotor does not rotate due to inertia.

How is starting winding disconnected when single phase induction motor runs up to speed?

Perhaps the most common use of centrifugal switches is within single-phase, split-phase induction motors. Here, the switch is used to disconnect the starting winding of the motor once the motor approaches its normal operating speed. These motors are called two-value or capacitor start capacitor run motors.

How could the capacitor affect the rotation of a single phase motor?

In order to create a rotating magnetic field, the capacitor is there to create a phase shift for one of the two motor windings. Certain AC Induction motors cannot start without a cap (start Cap switched) and a RUN Cap. These are necessary to shift the current phase 90 deg and start turning in the correct direction.

How does an induction motor run?

Working Principle of Induction Motor The motor which works on the principle of electromagnetic induction is known as the induction motor. The electromagnetic induction is the phenomenon in which the electromotive force induces across the electrical conductor when it is placed in a rotating magnetic field.

What is the special feature of single phase induction motor?

What is the special feature of single phase induction motor? Explanation: The single phase induction motor has no inherent starting torque. Thus special means should be used to make it self starting.

How do you change the direction of a single-phase induction motor?

Detailed Solution. The direction of rotation of a single-phase capacitor run induction motor is reversed by changing the direction of the rotating magnetic field produced by the main and starter winding or auxiliary winding. This can be accomplished by reversing the polarity of the starter or auxiliary winding.