What is the difference between AC Drive and VFD?
Answers were Sorted based on User's Feedback
Answer / r. anand
VFD(Variable frequency Drive) is a type of AC Drive.
There are two types of AC Drives of this category,
VVD (Variable Voltage Drive)in which the speed of the drive
can be controlled by varying the voltage input to the drive.
and
VFD (Variable Frequency Drive)in which the speed of the
drive can be controlled by varying the input frequency to
the drive.
| Is This Answer Correct ? | 18 Yes | 6 No |
Answer / mr. vinayak manohar hawal
AC drives control the speed of either an induction
motor or a synchronous motor by adjusting the frequency of
the power supplied to the motor.
AC drives are also known as adjustable speed drives
(ASD) or adjustable frequency drives (AFD) or variable
frequency drives (VFD) or variable speed drives (VSD) or
frequency converters (FC).
So I think that VFD is basicaly a method of AC drive
used for changing the speed of motor.
| Is This Answer Correct ? | 10 Yes | 1 No |
Answer / comil83
Both are same.Now a days most of company like
siemens,ABB,yaskawa..etc provides diffrent types of control
in drives like 1) v/f control with feedback 2) v/f control
without feedback 3) vector control with and without
feedback.
In v/f control u can varying speed with the help of v and f
but u can not control torque and in Vector control u can
control speed as well as torque.
| Is This Answer Correct ? | 7 Yes | 3 No |
Answer / gautam himmatramka
But generally the concept of drives is that the ratio of
Voltage to freq. should be constant at each instant of
operation of drives. So i feel AC drives are a genral term
with VFD as a more specific name of the same.
| Is This Answer Correct ? | 2 Yes | 0 No |
Both are same. comman name in Ac drive. In that by logic we
can segregate Vfd(variable freq. drive) VVd(variable
voltage drive).
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / suresh pethe
AC drive -- Variable voltage
VFD -- Variable Freqency
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / prabhakar jha
in vfd controlled speed & current by variation of frequency.speed & current directly proportional of frequency ...
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / rajesh jagtap
Actually AC Drive means a controller which require
Alternating Current power source and VFD means controlling
drive by varing frequency.
| Is This Answer Correct ? | 1 Yes | 2 No |
in VFD you can vary the speed according to flow hense power
is consumed acoordingly
in AC drvies the speed of the motor remains constant
whatever the speed you cant vary the speed.
| Is This Answer Correct ? | 10 Yes | 16 No |
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