The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors found in consumer and industrial applications. Induction devices are by much the biggest group of all commercial electrical machines, converting approximately 70-80% of all electricity into mechanical form. The employ a robust rotor construction, making them suitable for high-speed 
applications. With appropriate design, they have great 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