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Is VFD is part of Soft starters
Soft starters are used to limit load and torque during motor start up phase reducing material stress and wear of gearbox and other mechanical parts of power train. The speed setpoint is not adjustable.
Variable Frequency Drives give much more control over the motor as they are able to regulate acceleration/deceleration in closed feedback loop with immediate response from the encoders. The speed is controlled via PLC/other master system.
soft starter is used in A.C. electrical motors to temprorily reduce the load and torque.