The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is among the most popular motors found in consumer and commercial applications. Induction machines are by considerably the largest group of all commercial electrical machines, converting around 70-80% of all electrical energy into mechanical type. The employ a robust rotor construction, making them suitable for high-speed applications. With correct design, they have great overloading and field weakening features.
The ACIM is comprised of a straightforward cage-like rotor and a stator containing three windings
The changing field produced by the AC line Ac Induction Motora china 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