why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply

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why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / madhusudhan

inorder to produce constant magneticfield we required to
apply D.C rather than A.C. which gives variable magnetic
field

Is This Answer Correct ?    36 Yes 8 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / shantanu mishra

The DC current also called field current or excitation
current is given to produce magnetic field in which rotor of
the generator rotates and produces EMF. the EMF can be
varied by regulating field current.

Is This Answer Correct ?    8 Yes 2 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / mahesh

we need a rotational magnetic field of sine wave for the
emf to be induced . if dc is given, the field that is
produced in the air gap is almost a sine wave with constant
magnitude. for ac excitation the air gap flux is not a sine
wave .

Is This Answer Correct ?    8 Yes 4 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / u.vijay bhaskar reddy

for producing constant flux on the rotor

Is This Answer Correct ?    10 Yes 8 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / nagarjunacharya

to produce emf in the stator either we should apply
alternating flux or dynamic(rotating) conductor.as already
we are rotating rotar by prime mover ,wewe have to apply.

Is This Answer Correct ?    7 Yes 5 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / venkatrao chowdary

the dc current produce constant magnetic field.when rotor
conductors are rotated this conductors cuts the magnetic
lines of flux than emf is induced.this emf is called
dynamically induced emf.when ac is given to the alternater
it induces statically induced emf.the operation of
alternater we need dynamically induced emf.so ac is not
given to the alternater.

Is This Answer Correct ?    2 Yes 1 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / u.v.subhashreddy

alternator is an speeed machine. the dc current gives
exication current is given to produce a magnetic field so
giving d.c supply to field of an alternator.

Is This Answer Correct ?    2 Yes 2 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / y.srinath

dynamically induced e.m.f requires fixed polarity& magnetic flux .if we given a.c to field the polarity of a particular pole is not fixed .if one pole behaves as north pole for +ve half cycle & same behaves as north pole for negative half cycle to.that's why we are using d.c supply for alternator.

Is This Answer Correct ?    1 Yes 1 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / b madhu sudhan reddy

alternator is a constant speed machine.i.e it always runs
at synchronus speed.so,for producing constant speed we
require constant excitation.so,for the constant excitation
we require constant supplly.i.e d.c supply

Is This Answer Correct ?    6 Yes 7 No

why we are giving D.C. supply to field of an alternator, why can't we give the a.C. supply..

Answer / pravallika

for magnetising poles in rotor

Is This Answer Correct ?    2 Yes 3 No

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