The AC Induction Electric motor (ACIM), sometimes called a squirrel cage motor, is among the most popular motors used in consumer and 
industrial applications. Induction Ac Induction Motora china devices are by far the biggest group of all industrial electrical machines, converting approximately 70-80% of all electricity into mechanical type. The employ a 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 does not have any moving contacts, which eliminates sparking