The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is among the most popular motors used in consumer and commercial applications. Induction machines are by considerably the biggest group of all commercial electrical machines, converting around 70-80% of all electrical energy into mechanical form. The employ a robust rotor construction, making them ideal for high-speed applications. With Ac Induction Motora china proper design, they have good overloading and field weakening features.
The ACIM is made up of a simple cage-like rotor and a stator containing three windings
The changing field made by the AC line current in the stator induces a current in the rotor which interacts with the 
field and causes the rotor to rotate
The rotor doesn’t have any moving contacts, which eliminates sparking
