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What does VVVF stands for in VVVF drive ?
How does it differ from VVF drive?
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Answer Posted / velu
vvvf means variable voltage variable frequency drives.ie.we
can vary the voltage & freqency thru freq converters
Ns = 120 * f /p
Ns= 120 *50 /4
6000/4 = 1500 rpm
Ns= 1500 rpm this is normal
if change the freq
120 * 40 / 4
4800 /4 = 1200
Ns= 1200 rpm
so 1500 rpm motor run at1200 rpm or below depending upon
our application
if you reduce the freq , the speed also reduce thru drives.
A variable-frequency drive (VFD) is a system for controlling
the rotational speed of an alternating current (AC) electric
motor by controlling the frequency of the electrical power
supplied to the motor.[1][2] [3] A variable frequency drive
is a specific type of adjustable-speed drive.
Variable-frequency drives are also known as
adjustable-frequency drives (AFD), variable-speed drives
(VSD), AC drives, microdrives or inverter drives. Since the
voltage is varied along with frequency, these are sometimes
also called VVVF (variable voltage variable frequency)
drives.The synchronous speed of an AC motor is determined by
the frequency of the AC supply and the number of poles in
the stator winding, according to the relation:
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