What is Torque Vector Control in VVVF Drives?
Answers were Sorted based on User's Feedback
Answer / deepak g
In I.M, we generally consider the flux proportional to
torque and the slip prop. to speed in scalar control. Now
this is actually not valid for vector control. In vector
control we need to consider a dc drive analogy. i.e. the
torque is proportional to the armature current only and does
not affect flux (armature and field current which are
perpendicular to each other forming independent phasors ).So
by torque control i think it means controlling the real
component of the stator current which is formed after
resolving the stator current into quadrature and direct axis
currents.
Is This Answer Correct ? | 11 Yes | 2 No |
Answer / vishok
VVVF stands for variable voltage variable frequence. These
are simple V/F drives for the steady state applications eg
fan and pump which allows a lot of time for a speed change.
Here a speed set point serves a single command for speed
change and strength of magnetic field in motor.Therefore
Separate torque control is not possible in VVVF drives. So
the torque always remains constant in VVVF drives which
equals to V/F. The voltage and frequency in VVVF drives
varry in proportion in order to maintain the torque.
Is This Answer Correct ? | 6 Yes | 0 No |
Answer / hiren morkar
Scalar control is V/f control which you can use where load
behaviour is not dynamic, in scalar control u can not goes
above rated torque.the closed loop scalar control give more
precise solution.the closed loop scalar control give more
precise solution.
Vector control controling torque by seprated magnetizing
current and torque producing current, so that it can
control torque by controling flux.(magnetizing current).
It is used where load behaviour is dynamic ,the closed loop
control give more precise solution.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / ajay daultani
torque vector control is nothing but control of two vector
components of stator current i.e magnetizing current Im and
rotor ( or torque ) current Ir .
Ir = Is cos( fie )
Im = Is sin ( fie )
Is This Answer Correct ? | 3 Yes | 4 No |
Answer / arun
ya the above answer is correct..v/f is directly
proportional to flux .we have to maintain the flux constant
to produce constant torque..actually vector control means
tat we have to currents Idirect axis and Iquadrature
axis..Id controls the flux of the machine.Iq controls the
torque of the machine independently.
Is This Answer Correct ? | 1 Yes | 2 No |
Answer / vinod
it one kind of control method in the vfd.
for example the the unwinder and rewinder has a opposite
torque directions.
in unwinder the speed and torque will be in opposite
direction
in rewinder the speed and torque will be in same direction.
so,an effective toruqr control can be made with a vvfd.
Is This Answer Correct ? | 5 Yes | 7 No |
Dir sir we have 750 kva Caterpillar dg set we are fas on different problem we start dg set ofter 1 mint apply load around 500a dg was run one or 3 mint after 3 mints dg was shutdown automatic how to face tis problem
motor work in hat principle generator work in what principle transformer work in what principle pls explain with details or answered to ramadoss.sepc@gmail.com
what is the minimum insulation resistance for HT AND LT motor ?
what is meant by neutral Ct of a transformer and how it connected in transformer
testing of transformer
Is it advantages of having star-delta vfd than normal star vfd , if yes why?
cb used in railway applications is?
What is bridge rectifier and explain with details
If SFU is Switch Fuse Unit, What is the expansion for FSHF in Electrical Engineering?
we use 400/5A ct and 35/roor3KV,/0.1/root3KV,0.1/root3KV pt ratio. What is the multiple factor of this meter.
why air handling unit interloking in case of fire
What is the effect of positive feedback on the stability of the systems?