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 considerably the biggest group of all industrial electrical machines, Ac Induction Motor converting approximately 70-80% of all electricity into mechanical type. The have a very robust rotor construction, making them suitable for high-speed applications. With correct design, they have great overloading and field weakening characteristics.
The ACIM is made up of a straightforward 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 doesn’t have any moving contacts, which eliminates sparking