An AC motor is a type of electrical motor, which is driven by alternating current (AC). A stator or set of stationary electric coils makes it. The stator is stationary and surrounds the rotor or the rotating part of the motor. The rotor is attached to the shaft of the motor, which is what turns. The rotation of the motor is initiated when the coils are supplied with an alternating current, which then generates a magnetic field, which rotates around the stator. The rotor has fixed magnets to produce an additional magnetic field, which interact with the generated magnetic field created by the coils on the stator. Once this interaction of magnetic fields is established a force is exerted, and rotational torque is generated and the motor turns or rotates as desired. 

 

The two rotating magnetic field pull and push each other along and create the rotational motion desired in a motor. It is important that the magnetic fields are synchronous; otherwise any asynchronicity would result in a non-uniform torque, and cause the motor’s rotation to and rotational force to be unbalanced and introduce slip.

 

An induction or asynchronous motor differs from that of a synchronous motor, in that the induction motor takes advantage of the concept of slip or differences in the speed of the rotor and the stator’s magnetic field to induce current in the rotor’s windings. There is always a lag in the rate of the rotating magnetic field, whereas the synchronous motor is exactly synchronous with the rotating magnetic field, as it does not use the principle of slip or induction, because of its fixed magnets in the rotor.