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Difference between Single-phase and Threephase Induction Motor
The differences between a single-phase and a three-phase induction motor are given below −
A 1-phase induction motor requires single-phase AC supply, whereas a 3-phase induction motor need a source of 3-phase AC supply for its operation.
1-phase induction motors produce low starting torque, whereas 3phase induction motors produce high starting torque.
The efficiency of a 1-phase induction motor is less as compared to a 3phase induction motor.
The power factor of a 1-phase induction motor is low, while the power factor of a 3-phase induction motor is high.
1-phase induction motors are simple in construction, reliable and economical as compared to 3phase induction motors.
1-phase induction motors are easy to repair and maintain as compared to a 3phase induction motor.
A 1-phase induction motor develops about 50% of the output power of that of a 3-phase induction motor for the same size and temperature rise.
A 1-phase induction motor is expensive than a 3phase induction motor of the same rating.
1-phase induction motors are mainly used in low-power applications like small industries and domestic and commercial applications, while 3phase induction motors are used in high-power applications such as in large industries.
Comparison between Single-phase and Three-phase Induction Motor
The following table shows a summary of the differences between a single-phase induction motor and a three-phase induction motor −
|Parameter||Single-Phase Induction Motor||Three-Phase Induction Motor|
|Supply||1-phase supply||3-phase supply|
|Construction||Simple & robust||Complex & robust|
|Reliability & Cost||More reliable & low cost||Less reliable & expensive|
|Applications||Used in low power applications such as in domestic appliances.||Used in high power industrial applications.|