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The AC Induction Motor (ACIM), sometimes called a squirrel cage motor, is one of the most popular motors used in consumer and commercial applications. Induction machines are by significantly the biggest group of all industrial electrical machines, converting approximately 70-80% of all electricity into mechanical form. 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 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