what is difference between AC VVVF drive & Dc VVVF drive
explain their working principle?
Answer Posted / gaurav
Ac drives ,or VVVF i.e variable voltage variable frequency
drive works on converting A.c into D.C through converter
(rectifier circuit),then storing the D.C voltage in dc bus
bar and through proper switching of the inverter circuit
(basically IGBTs)this D.C is converted into A.C of required
voltage and frequency,hence it saves power.
there is nothing like D.C VVVF. yes in case of D.C drive we
have to convert A.C into D.C and provide armature and field
voltage to the motor.conversion of A.c to D.C is through
SCRs as we require control dc output.
Is This Answer Correct ? | 32 Yes | 1 No |
Post New Answer View All Answers
What is the breaking capacity of transformer and how can we calculate the breaking capacity of tranformer
what's the difference between 'shaft power demand' and 'BHP' , when we consider electrical load list.
block diagram of 2 ups system connected in parallel mode?
WHATIS TIME CONSTANT? WHATIS ITS SIGNIFICANCE? ILLUSTRATE THROUGH EXAMLES.
What are merits & De-merits of State-Space Method? What is series programming, parallel programming, general programming & direct programming ? And, difference between these programmings Techniques ?
if we run a 3 phase machine on two phase what will happend??? given answer with solid reason please
our industries ht line so power fluctation(once drop of power please rectify causes
Briefing the effects of ASR and ACR of a double closed-loop speed regulating system.
when measure the core loss of three phase distribution transformer or three phase reactor loss, one phase shown negative watt loss. why??
Do closed loops systems require manual input?
what happen when increase or decrease size of lamp,light.glass.
PLEASE SEND ME NTPC RELATED INFORMATION LIKE WHICH TOPICS HAV MORE SCOPE,BOOKS TO READ,CUT OFF...PLEASE.mail at thiru.1203@gmail.com
The specific heats of the gas at constant pressure and constant volume are respectively 1.0 kJ/kg K and 0.72 kJ/kg K; the value of R for the gas is
what is meant by 2 within a star in a voltmeter dial?
WHAT IS SHORT CIRCUIT STRENGTH OF 100 AMPS MCCB?