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 machines are by significantly the biggest group of all industrial electrical machines, converting approximately 70-80% of all electrical energy into mechanical type. The have a very robust rotor construction, making them suitable for high-speed applications. With correct design, they have good 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 Ac Induction Motora china interacts with the field and causes the rotor to rotate
The rotor doesn’t have any moving contacts, which eliminates sparking