Induction motor is a simple, rugged and one of the most popular motors in the electrical industry. Whereas synchronous motor is a complex, comparatively costly motor which requires a lot of maintenance as compared to the induction motor. Both machines are widely employed in the electrical industry and are used for their specific applications. Given below are the top ten differences between induction and synchronous motor.

Induction MotorSynchronous Motor
No dc field current is required for excitationA separate DC field current is required for excitation
Simple constructionComplex construction
Always runs at speed that is less than synchronous speedAlways runs at synchronous speed
Speed control is possible Speed control is not possible
Cannot be used for power factor improvement It can be used for power factor improvement
Sudden load changes has no significant effectSensitive to sudden load changes
Doesn’t requires lot of maintenance It requires a lot of maintenance
Motor runs at lagging power factor onlyMotor can run at leading as well as lagging power factor
An increase in load decreases the speed of motorWith increase of load, the speed still remains same
Is inexpensive as compare to synchronous motorCostly