Comparison of Single and Three Phase Motors

Single Phase motors.
Three phase motors.

Carry more current for the same power resulting in more losses.
Carry less current for the same power resulting in less losses.

Are easy to construct.
Are difficult to construct.

They can be made into small sizes.
Difficult to construct motors of small sizes.

Single phase power is available easily than three phase power.
Three phase power is not available universally.

Low Starting Torque.
High Starting Torque.

Torque pulsations are high due to the pulsating magnetic field.
Torque pulsations are less due to the rotating magnetic field.

Reversing the direction of rotating is difficult.
Easy to reverse the direction of rotating (changing the position of any two phases)

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