The basic function of a VFD, Variable Frequency Drive, is to control the speed (rpm) of an AC induction motor. VFD converts AC power into DC. It uses DC voltage to create DC pulses of varying frequency to run the output motor at a speed other than standard rpm at 2, 4, 6 and 8 poles.
The major features of a VFD are:-
Also, VFDs reduce the motor start-up in-rush current by gradually accelerating the motor. This makes VFDs suitable for applications like:-
While choosing a VFD, Variable Frequency Drive, several factors must be kept in mind apart from voltage and current requirements. The name should also be carefully decided as it is often called a variable speed drive, microdrive, adjustable speed drive, and frequency inverter.
Appropriate selection of a VFD is very important for the optimal operation of the motor system. In order to one must know
Also, it is advised to properly analyze the motor and system requirements that help in selecting a proper VFD.
Most of this information related to the motor can be found on the nameplate like:
Other information related to the needs of the control system and application are:-
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