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DIRECT CURRENTGENERATOR

By Agustama Saputra

1223110253

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DC generatorDC generators is dc machines used as

generator.

A DC generator produces direct power.Based on fundamental principle of

araday!s law of electromagnetic induction.

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"or#ing $rinciple of DC %enerator&t is seen that in the 'rst half of the

re(olution current )ows alwaysalong AB*+CD i.e. ,rush no 1 incontact with segment a. &n the ne-t

half re(olution in the 'gure thedirection of the induced current inthe coil is re(ersed. But at thesame time the position of thesegments a and , are also re(ersedwhich results that ,rush no 1comes in touch with that segment,. /ence the current in the loadresistance again )ows from * to +.

 he wa(e from of the currentthrough the load circuit is as shownin the 'gure. his current isunidirectional.

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 his is ,asic wor#ingprinciple of DCgenerator e-plained

,y single loopgenerator model.

"or#ing $rinciple of DC %enerator

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i(e maor types of dc generators classi'edaccording to the manner in which their 'eld )u- is

produced

Separately excited generator

Shunt generator

Series generator

Cumulatiely compounded generator

Di!erentially compounded generator

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Separately excited generatorIn separately excited generator" the #eld

$ux is deried %rom a separately po&er source independent o% the generatoritsel% '

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Shunt generatorIn a shunt

generator" the#eld $ux is deried(y connecting the#eld circuit directly across theterminals o% the

generators

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Series generator

In a seriesgenerator" the #eld$ux is produced (yconnecting the #eldcircuit in series&ith the armatureo% the generator

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Cumulatiely compounded

generatorIn a cumulatiely

compoundedgenerator" (oth ashunt and series#eld is present"and their e!ectsare additie

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Di!erentially compounded

generator

In di!erentially compounded generator) Ina di!erentially compounded generator"(oth a shunt and a series #eld arepresent" (ut their e!ects are su(tractie'