The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is among the most popular motors found in consumer and industrial applications. Induction machines are by considerably the largest group of all commercial electrical machines, converting around 70-80% of all electrical energy into mechanical form. The have a very robust rotor construction, making them suitable for high-speed applications. With correct design, they have good overloading and field weakening features.
The ACIM is comprised 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 
doesn’t have any moving contacts, which eliminates sparking