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