Single Phase Induction Motor

We utilize the single-phase power system more widely than three phase system for household purposes, commercial purposes plus some extent in commercial uses. Because, the single-phase system is less expensive than a three-phase system and the power requirement in most of the homes, shops, offices are little, which can be quickly met by an individual phase system.

The single phase AC motors are further classified as:

One phase induction motors or asynchronous motors.

Single phase synchronous motors.

Commutator motors.

The squirrel cage rotor includes aluminum, brass or copper bars. These aluminium or copper bars are called rotor conductors and placed in the slot machine games on the periphery of the rotor. The copper or light weight aluminum rings permanently brief the rotor conductors known as the end rings.

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


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