Electromagnetism : The working principle of Single phase AC Induction motor.

In previous post, we learn the parts of AC motor and AC generator. I hope you know about the parts, If you don't know the parts go to the post (Electromagnetism : parts of AC motors and AC generators.) Now we going to look about how single phase motor works. So dummies let learn some motor stuff.

To understand the working principle of  Single phase AC induction, you need to know function of two main parts of this motor. The stator winding which create revolving magnetic field and the rotor will rotate with the revolving magnetic field. In this single phase  AC induction motor, there's two winding in stator. One is Main winding another is staring winding.

The function of Staring winding is provide a self starting to the motor and the main winding is to provide revolving magnetic field to the rotor. Now the motor works by these two winding. When the main winding is energize, it produce revolving magnetic field. This RMF will induce the rotor which made of rotor bar create it's own magnetic field. When this happen, both magnetic field will align to the opposite magnetic pole. 

Now here's the tricky part. The main winding will create pulsating magnetic field which divide into two field will rotate in opposite direction. This will cause the rotor to not self start and the rotor will vibrate.

In order to solve this problem, a starting winding and a capacitor is placed in the motor. When the staring winding is energize,It will create rotating magnetic field that cancel out one of  the pulsating magnetic field and the motor self start. When the motor reach a certain speed the centrifugal switch will disconnect the starting winding and the rotor will rotate respected to the rotating magnetic field. 

The reason capacitor is place to the starting winding is for power factor correction and to give good self starting to the motor.  

HOPE YOU UNDERSTAND HOW SINGLE PHASE AC INDUCTION MOTOR WORKS. KEEP READING THIS BLOG. THERE'S MORE UPCOMING POST TO HELP YOU UNDERSTAND ELECTRICITY MORE. SO STAY ELECTRIFY!!!!