Difference Between Synchronous Motor And Induction Motor

July 22, 2020July 3, 2022 CS Electrical And Electronics

Hello Guys, welcome back to my blog. In this article, I will discuss the difference between the synchronous motor and induction motor in terms of various factors like construction, speed, sensitivity, etc.

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Difference Between Synchronous Motor And Induction Motor

The main differences are:

01. Construction
02. Separate Source
03. Speed Control
04. Operating Power Factor
05. Sensitivity
06. Starting
07. Speed
08. Load and Speed
09. Power Factor Improvement
10. Cost and Maintenance

Now I will discuss each and every point in detail.

01. Construction – The construction of a synchronous motor is complicated whereas the construction of the induction motor is simple. The cage rotor of the induction motor is very simple in construction.

02. Separate Source – In the case of SM, a separate dc source is required for rotor excitation whereas in the case of induction motor separate dc source is not required as the rotor gets excited by induced electromotive force i.e., emf.

03. Speed Control – As an SM is a constant speed motor, speed control is not possible whereas in the IM speed can be controlled through difficulties.

04. Operating Power Factor – The IM operates only at a lagging power factor and power factor control is not possible whereas in the case of the SM, by changing the excitation power factor of the motor can be changed to lagging and leading,

05. Sensitivity – The SM is very sensitive to load and there is a chance of hunting whereas in the case of an IM hunting is not present.

06. Starting – We all know that the synchronous motor is not self-starting whereas the induction motor is self-starting.

07. Speed – In SM speed is always constant and the speed is always irrespective of load whereas in the case of induction motor speed is always less than the synchronous speed but never synchronous. The speed of an IM is not constant.

08. Load and Speed – In the case of IM, if the load increases then the motor speed will decrease whereas in the case of SM, speed remains the same if the load is varying also.

09. Power Factor Improvement – The SM can be used to improve the power factor. The synchronous motor can be used as a synchronous condenser to improve the power factor. If the synchronous motor is overexcited without connecting a load then if the motor is connected in parallel with the other devices then the motor will improve the power factor of that device. Whereas IM cannot be used to improve the power factor.

10. Cost and Maintenance – The SM is very costly and synchronous motor frequent maintenance is required whereas the cost of IM is cheap and the maintenance of motor is not required.

So, guys, these are some differences between the synchronous motor and induction motor.

Conclusion – According to my, the synchronous motor should be used where constant speed is required and where power factor improvement is required. And the induction motor should be used where speed control is required.

I hope this article may help you all a lot…..

Thank You For Reading…..Bye…

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