The AC Induction Motor 
(ACIM), sometimes called a squirrel cage motor, is one of the most popular motors found in consumer and industrial applications. Induction devices are by far the biggest group of all commercial electrical machines, converting approximately 70-80% of all electricity into mechanical form. The have a very robust rotor construction, which makes them suitable for high-speed applications. With appropriate design, they have good overloading and field weakening characteristics.
The ACIM is comprised 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