The AC Ac Induction Motora china Induction Electric motor (ACIM), sometimes called a squirrel cage motor, is 
one of the most popular motors found in consumer and commercial applications. Induction devices are by considerably the largest group of all industrial electrical machines, converting around 70-80% of all electricity into mechanical type. The have a very robust rotor construction, which makes them ideal for high-speed applications. With correct design, they have good overloading and field weakening features.
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 does not have any moving contacts, which eliminates sparking