The AC Induction Electric motor (ACIM), Ac Induction Motora china sometimes called a squirrel cage motor, is one of the most popular motors found in consumer and commercial applications. Induction devices are by significantly the largest group of all commercial electrical machines, converting approximately 70-80% of all electrical energy into mechanical type. The employ a robust rotor construction, which makes them ideal for high-speed applications. With correct design, they have good overloading and field weakening 
characteristics.
The ACIM is made up of a straightforward 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 does not have any moving contacts, which eliminates sparking