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Synchronous vs. Induction Motor: Key Differences

electric motor synchronous motor induction motor motor comparison electrical engineering

This article highlights the differences between synchronous motors and induction motors, two common types of electric motors.

Synchronous Motor vs. Induction Motor Comparison

FeatureSynchronous MotorInduction Motor
StartingNot self-startingSelf-starting
SpeedAverage speed is always synchronous; independent of load.Normal speed is less than synchronous, and decreases as load increases.
Power FactorCan operate at all power factors (lagging or leading).Operates only at a lagging power factor.
Speed ControlSpeed control is generally not a factor.Speed can be controlled, particularly in smaller units.
ExcitationRequires a DC exciter.No exciter is required.
CostMore expensive to manufacture.Much cheaper to manufacture.
ApplicationsUsed for mechanical output and to improve power factor (as a synchronous condenser).Primarily used to supply mechanical load.