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 much the biggest group of all commercial 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 good overloading and field weakening characteristics.
The ACIM is comprised of a straightforward cage-like rotor and a Ac Induction Motora china 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