FREQUENTLY ASKED QUESTIONS – AC DRIVES

1. What is VVVF Drive ?
VVVF drive (also called VVVF Inverter) is a power electronic controller used to control
the speed of 3 phase AC Motors (synchronous or induction) by varying the frequency
and voltage applied to the motor terminals. Voltage and frequency relationship is decided
based on the motor name plate data and the load characteristics.
Advantages of VVVF Drives are –
a) Stepless speed can be achieved which is required in process control.
b) Energy saving.
c) Improvement in productivity.
d) Process improvement and better quality of the product.

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