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Variable-frequency drive
A
variable-frequency drive
(
VFD
) (also termed
adjustable-frequency drive
,
variable-speed drive
,
AC drive
,
micro drive
or
inverter
drive
) is a type of
adjustable-speed drive
used in
electro-mechanical
drive systems to control
AC motor
speed
and
torque
by varying motor input
frequency
and
voltage
.
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