The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors used in consumer and commercial applications. Induction devices are 
by far the largest group of all commercial electrical machines, converting approximately 70-80% of all electrical energy into mechanical type. The employ a robust rotor construction, making them suitable for high-speed applications. With proper design, they have good overloading and field weakening features.
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 Ac Induction Motora china causes the rotor to rotate
The rotor does not have any moving contacts, which eliminates sparking