The AC Induction Motor (ACIM), sometimes called a Ac Induction Motora china squirrel cage motor, is one of the most popular motors found in consumer and commercial applications. Induction machines are by significantly the biggest group of all industrial electrical machines, converting around 70-80% of all electrical energy into mechanical type. The have a very robust rotor construction, which makes them suitable for high-speed applications. With proper design, they have great 
overloading and field weakening characteristics.
The ACIM is comprised of a straightforward cage-like rotor and a stator containing three windings
The 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