Differences between Soft Starter & VFD

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Differences between Soft Starter & VFD


Soft StarterVFD (Variable Frequency Drive)
A semiconductor based motor starter capable of safely starting & stopping a motor.Semiconductor based motor starter that can safely start, stop & also vary the speed of the motor.
At full speed, the soft starter is bypassed using a contactor. It operates throughout the whole operation of the motor.
It only regulates the AC voltage using thyristors.It converts AC into DC & back into AC of the desired value.
It can only vary the supply voltage.It can vary voltage as well as the frequency.
It can generate low to medium starting torque.It can generate high starting torque.
There are no harmonics generated in the system.It generates harmonics in the system.
It does not need any additional filters.It needs filters due to harmonics injection in the line.
It is used for constant motor speed application.It is used for variable motor speed applications
It is smaller in size as compared to VFD.It is larger in size.
It is cheaper than VFD.It is expensive.

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