The AC Induction Engine (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors found in consumer and commercial applications. Induction machines are by considerably the biggest group of all industrial electrical machines, converting around 70-80% of all electricity into mechanical type. The employ a robust rotor Ac Induction Motora china construction, which makes them suitable for high-speed applications. With appropriate design, they have good overloading and field weakening characteristics.
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 does not have any moving contacts, which eliminates sparking