why dc supply is given to the field of alternator
Answers were Sorted based on User's Feedback
Answer / ashis
DC supply is given to field of alternator in order to provide more excitation to it,so that it will magnetically luck with the rotating armature flux.if ac supply is given then-
-direction of magnetic field will change continously,which will effect in output voltage.
-uniform excitation cannot be made due to +ve,and -ve haif cycle of ac.
-it may happen rotor will not rotate at all
| Is This Answer Correct ? | 8 Yes | 1 No |
Answer / ravikumar.g
For the alternator excitation by using the DC voltage.
For this excitation the field will genarate the residiual
maganetisim in the alternator.
When the alternator start running this excitation voltage
is induce the more voltage.
| Is This Answer Correct ? | 5 Yes | 1 No |
Answer / nandan bikash sarma
when we will use ac as the exitation the direction of the
magnetic field (NORTH AND SOUTH pole) will change as the
direction of the current changes This will effect the
voltage that we getting from the alternator.So we use a dc
magnetic field
| Is This Answer Correct ? | 6 Yes | 3 No |
Answer / sanjay kumar
the field of the alternator consists of strong
electromagnets which create a magnetic flux linkage around
it.to make this magnetic field more stronger so that this
gets locked magneticaly with revolving magnetic field thru
stator armature when ac supply is given thru stator
armature core wid ease, dc supply or dc excitation is given
to it.
| Is This Answer Correct ? | 10 Yes | 8 No |
Answer / sanjay kumar
the reason why ac is not given to the excitation of field
of alternator lies behind the concept of mutual
induction.if ac field'll be given again the problem starts
when field current will rise and leads to deexcite
itself.hence it will not give uniform excitation like dc
current.
| Is This Answer Correct ? | 3 Yes | 1 No |
Answer / lavanya
If we give ac supply nto the field pulsating flux produced
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / anthony
To begin with if ac is given then the problem would be
that the field flux linking with the armature , i.e.imagine
the arm. cond. looking into the field flux , as the field
flux passes the arm. conductor (field = consider ac
excitn.) the arm would see two zeros, one being the natural
zero of ac excitation and the other being the zero produced
due to the field's continous forward motion . Hence the
nett emf produced would however reach one zero in halfcycle
but would have intermediate sags in its waveform (imagine
this concept from the view of the arm . cond.). This is the
reason why the arm. is not given ac excitn.
| Is This Answer Correct ? | 4 Yes | 5 No |
hai...... tis is Hemanth. jst now completed electrical engineering... i wanna to apper for ap tranco exam... plzz send me the previous q's paper link......thanx in advance.
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