what is difference between AC VVVF drive & Dc VVVF drive
explain their working principle?

Answer Posted / s.balamurugan

If frequency increase speed will increase, If frequency
decrease speed will decrease. so when the frequency is
zero, there is no speed(rotation).that means there is no Ac
voltage.so this voltage like dc (because there is no
frequency).

Is This Answer Correct ?    31 Yes 6 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

which pump used in WTP explain the function of VFD how to dtermine capacitorbank of capacity one plant

1479


Control cables in S's will carry 1000v which is AC R DC? Pls answer meĀ 

1606


what is the relationship between current&voltage in practical purpose ?

4284


How select ELCB for 32amp. socket having quantity 12Nos. We have to do this wiring in PLANT. Please Also explain the incoming cable specification.

1489


why we use single core 630mm2 cable for transformer secondary side

489






difference between high and low impedance BUS BAR relay??

1073


difference between the applicability of nortons and thevenin theorem

1561


What are the specifications for conducting earth leakage test as per IEC standard?

1523


How do you select the pickup value of the relay?

819


hi there i am highly enthusiastic about discussing electrical concepts , and hence i wud lyk to invit al do intrested to join me at gtalk and hav a dscussun of the concepts , ad me as a freind . my email id is rakesh.2k99@gmail.com

1643


hi Is there any possibilities to find out the rotation of a shaft or something else by using electromagnectic waves or by IR rays.If s then can v change the dir., of rotation of the same by remotely?& how? plz dn't any1 say "NO r CAN'T"

1617


boiler is running in rankine cycle and deisel generator is....?

1575


c++ write a program to use a fuction call "max"which accepts an intger arrey of size5.as an arrument and return the larger and smallest of the arrey to main without changing. the original changing of the original position of the element of the arrey.

1478


volts=230 c=10mf a=??

1587


what will be the effect if you were using different brands of outlets?

1474