We utilize the single-phase power system more widely than three phase system for domestic purposes, commercial purposes and some extent in commercial uses. Because, the single-phase system is more economical than a three-phase program and the power requirement in most of the homes, shops, offices are small, which can be very easily met by an individual phase system.

The single phase AC motors are further classified as:

Solitary phase induction motors or speed reducer asynchronous motors.

Solitary phase synchronous motors.

Commutator motors.

The squirrel cage rotor contains aluminum, brass or copper bars. These aluminium or copper bars are known as rotor conductors and placed in the slots on the periphery of the rotor. The copper or aluminium rings permanently brief the rotor conductors known as the end rings.

To provide mechanical power, these rotor conductors are braced to the finish ring and hence form a complete closed circuit resembling a cage and therefore got its name as squirrel cage induction electric motor. As end rings permanently short the pubs, the rotor electrical resistance is very small in fact it is not possible to add external level of resistance as the pubs get completely shorted. The lack of slip band and brushes make the construction of single phase induction motor very easy and robust.