In DC motor,the field MMF is given by NI.N-no.of field
winding turns,I-excitation and both are constant.Then how
could the main flux decreases due to armature reaction.
Answers were Sorted based on User's Feedback
Answer / vivin
This armature reaction has two effects
i)demagnetising the field flux(The direction of the flux
around armature conductors can be inferred from the fleming
RH rule)
i))Distortion of the field flux becoz it is in diferent
direction withrespect to main field flux.
Is This Answer Correct ? | 11 Yes | 1 No |
Answer / najib
In the absence of armature current if we imagine the field
mmf then it passes through the air gap without any
distortion.However as soon as there is a flow of armature
current the forst effect that comes into picture is
crossmagnetization provided saturation is neglected.Hence
it can be concluded the if saturation is neglected there is
no demagnetization but only crossmagnetization.In reality
saturation does set in and cause demagnetizationalong with
crossmagnetization.
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / avinash
By Lenz's Law: current in motion will oppose the cause of the motion. The armature current is in motion due to the MMF hence it will oppose (diminish) the MMF.
Is This Answer Correct ? | 0 Yes | 0 No |
How does a diesel generator works?
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.
What are the factors to be considered during the Synchronization?
hi plz send me reliance placement papers..i.e electrical technical papers that have been asked in reliance test.
hi i wonder will the speed of a 50hz AC motor reduce if i supply it with 25hz?
What is high frequency grounding????Applications........
what is the current setting for different relay protection for transformer .
what is the difference between thyristors and capacitors
Sir We have a REF relay connected to 10MVA(Y-Y) Transformer.on External earth fault REF relay trips along with earth fault relay.The REF relay has no complant as we tested relay.Why is it happening?
checking procedure of capacitor based motors.used in fans etc?
Alternator rotor earth fault relay circuit
what is circuit breaker in transfomer and where it used