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 |
expansion of rccb
hello, I need to know exactly what happen in the motor while it is connected to the (star/delta) starter, mechanical and electrical. Thaks for answering
Why PT burnts?
How do we calculate Blower drive Power (kw) If we have Volume m3 and Pressre (mmWC)
What are the Safety Steps While Inspection the LT Panel.
What is the operating principle of turbo-generator.
Why is the starting current high in a DC motor?
In case of power/distribution transformer what is percent impedence?
What is the significance of integral controller and derivative controller in a pid controller?
What is the fuction of surge arrester and surge suppressor? Modern days line designes are based on which surge?
how does this job compare with others you have aplied for?
Define the term factor of inertia.