The AC Induction Electric 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 considerably the largest group of all industrial electrical machines, converting approximately 70-80% of all electrical energy into mechanical form. The have a very robust rotor construction, making them suitable for high-speed applications. With correct design, they have great overloading and field weakening features.
The ACIM is made up of a simple cage-like rotor and a stator containing three windings
The Ac Induction Motora china changing field produced 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