AC motors is an electric motor drive by an alternating current (AC). They commonly consists of two basic parts. Outside stator having coils supply with alternating current to generate a rotating magnetic field. And an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, or DC or AC electrical winding.
The two main types of AC motors are induction motors and synchronous motors. Moreover, The asynchronous motor always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding.
As a result, the induction motor cannot produce torque near synchronous speed where induction (or slip) is irrelevant or ceases to exist. Thus, The synchronous motor produces its rated torque at exactly synchronous speed.
In 1832, French Hippolyte Pixii generated a crude form of alternating current when he designed and built the first alternator. It consisted of a revolving horseshoe magnet passing over two wound-wire coils.
Because of AC’s advantages in long-distance high voltage transmission, there were many inventors in the United States and Europe during the late 19th century trying to develop workable AC motors.