Answer / zakeer

in dc motor commutator converted DC to AC

in DC genator its function is AC to DC that's way we called
as commutator is a mechanical rectifier

Answer / saad

first of all ,it is dc motor not a generator.
We are already giving it a dc current ,so normally there
should not have been any need of commutator'
but as the armature is rotating, with every half
rotation ,the direction of rotation is reversed.
so it should be rotating in anti_clock wise direction for
half cycle and in clock_wise direction for next half cycle.
to cater this ,the direction of current should be reversed
after every half cycle.
that's why a commutator is used to change the direction of
current to cater the problem of torque

Answer / murali

in d.c motor commutator serves in produsing unidirectional
torque

Answer / a.balakrishnan

The DC Generator generate the AC supply only in Armature
not DC Supply.But we want Dc source , so want one converter
thats why we use commutator.In shortly we can say its
converts AC source to DC source.

Answer / dharmesh

commutator function in the dc motor is to convert dc
quantity into ac, so it produces regular torque.
& in case of generator it converts ac quantity into dc.
THE FUNCTION OF COMMUTATOR IN DC MOTOR IS TO REVERSE THE
DIRECTION OF CURRENT.

thank you.

Answer / rahul thakur

A commutator serves two purpose in DC Machines-the first
one is to convert alternating quantities into direct
quantities and vice-versa and second is to keep the rotor
or armature MMF stationary in space.

Answer / raju kanjariya

first of all ,it is dc motor not a generator.
We are already giving it a dc current ,so normally there
should not have been any need of commutator'
but as the armature is rotating, with every half
rotation ,the direction of rotation is reversed.
so it should be rotating in anti_clock wise direction for
half cycle and in clock_wise direction for next half cycle.
to cater this ,the direction of current should be reversed
after every half cycle.
so, commutator is a converting d.c to a.c
because we are giving a pulse of every half cycle.that
called a function of commutator in dc motor

Answer / santosh jagale birla cellulosi

THE USE OF COMMUTATOR IN DC MOTOR IS JUST REVERSE THE
DIRECTION OF CURRENT & NOTHING ELSE. ALSO YOU FIND THE NO.
OF UNEVEN COMMUTATOR SEGMENTS. FOR MORE DETAILS REMEBER
THE WORKING OF DC MOTOR

THANK YOU

Answer / reddy

commutator periodically reverses the current direction
between the rotor and external circuit....

Answer / prabakaran

Dear all please note commutator is not a converter, all are
telling dc ot ac, we already giving dc supply to motor
through motor terminals at A1 & A2 (ie.+ & -) it is
transformed to rotor winding or bars through Brush and
commutator.

DC supply - Motor TB A1&A2 - Carbon Brush - Commutator -
Rotor winding or copper bars

After taking shutdown of 11kv feeder, if you see 5kv by phasing stick in the cable side, is it possible to close earth switch in cable.

1 Answers   KSEB, L&T, Siemens,

Why (In India) we preferably go for +-30 deg connection of transformer? what are the advantages in this connection?

2 Answers  

How synchronous motor helps to improve PF? plz explain

1 Answers  

why constant voltage transformer should be start without load? and if started then what will happen?

1 Answers  

How to increase solar cell efficiency ?

1 Answers  

america 60hz electric supply is used; but india it is 50hz; why? and if we use 60 hz supply what changeg has to be done or all the equipment has to be thrown which has rating of 50hz frequincy

1 Answers  

what is the purpose of the armored for the power Or control cable? How to select the type of the armored?

1 Answers   Siemens,

what happen if i connect DYn11 and DYn1 vector group transformer in parrallel?other things are same like votage ration,x/r ratiob etc...

4 Answers  

What is distance protection relay? where & why we use this relay?

2 Answers   Siemens, UltraTech, Voltech,

A 400KVA Transformer has 400Hz frequency.if frequency is changed to 50Hz,then what will be the new KVA rating?

2 Answers   ABC,

What is the difference between CT for protection and Ct for metering?

16 Answers   BirlaSoft,

what is the relation between Sq mm of wire and its current carrying capacity?

5 Answers   Finolex,