Difference Between Synchronous Motor and Induction Motor

In this topic, you study the difference between synchronous motor and induction motor.

Difference Between Synchronous Motor and Induction Motor

The comparison between three-phase synchronous motors and induction motors is given in Tabular form

Parameters Synchronous Motor Induction Motor
Construction More complicated construction. Simple construction, particularly in the case of a squirrel-cage induction motor.
Excitation Motor requires d.c exciter. No d.c. excitation required.
Starting Inherently, not self-starting. Self-starting.
Operation For a given frequency, its average speed is always synchronous and independent of load. Its speed is always less than that of synchronous and dependent to some extent on load.
Speed control Speed control not possible. Speed control possible over a limited range.
Power factor By changing its excitation, the motor can be operated with a wide range of power factors, both lagging and leading. The motor operates at only lagging power factors which become very low at light loads. Efficient control of its power factor is not possible.
Torque Its torque is less sensitive to changes in supply voltage. Its torque is more sensitive to changes in supply voltage.
System Disturbance Motor is sensitive to system disturbances and sudden changes of load, and loses its synchronism under extreme conditions. Motor is less sensitive to system disturbances and sudden changes of load.
Cost Comparatively, the motor is costlier. The motor is much cheaper.
Application Employed for supplying the mechanical load as well as for power factor improvement. Application is limited to the supply of mechanical load.

Leave a Comment

error: Content is protected !!