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Single Phase Induction Motor

Single Phase Induction Motor

We use the single-phase power system more widely than three phase system for domestic purposes, commercial purposes and some extent in industrial uses.

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single phase induction mot

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


The single phase AC motors are further classified as:

  1. Single phase induction motors or asynchronous motors.

  2. Single phase synchronous motors.

  3. Commutator motors.

The squirrel cage rotor consists of aluminum, brass or copper bars. These aluminum or copper bars are called rotor conductors and placed in the slots on the periphery of the rotor. The copper or aluminum rings permanently short the rotor conductors called the end rings.

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

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single phase induction motor

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