The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors used in consumer and industrial applications. Induction machines are by far the largest group of all commercial electrical machines, converting approximately 70-80% of all electrical energy 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 features.
The ACIM is made up of a simple cage-like rotor and a stator Ac Induction Motora china containing three windings
The changing field produced 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