dc motor.pptx

8/19/2019 DC MOTOR.pptx

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DC MOTORASHVANI SHUKLA

MANAGER(C&I)

BGR ENERGY SYSTEMS LTD.


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INTRODUCTION

Electrical !t!r" are e#er$%ere ar!' '". Al!"t all te elec!#eet" %e "ee ar!' '" are ca'"e eiter +$ a A.C. !r aHere %e %ill +e e,-l!ri ti" /i !0 !t!r". Ti" i" a e#ice telectrical eer$ t! a ecaical eer$.

1rici-le !0 DC M!t!r

Ti" DC !r direct current motor %!r/" ! te -rici-al2 %ecarr$i c!'ct!r i" -lace i a aetic 3el2 it e,-eriece" a" a teec$ t! !#e. Ti" i" /!% a" !t!ri acti!. I0 tc'rret i te %ire i" re#er"e2 te irecti! !0 r!tati! al"! re#aetic 3el a electric 3el iteract te$ -r!'ce a eca+a"e ! tat te %!r/i -rici-le !0 dc motor e"ta+li"e.

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Te irecti! !0 r!tati! !0 a ti" !t!r i" i#e +$ 6lei7" le0t a r'l"tate" tat i0 te ie, 3er2 ile 3er a t'+ !0 $!'r le0t a a't'all$ -er-eic'lar t! eac !ter a i0 te ie, 3er re-re"et" taetic 3el2 ile 3er iicate" te irecti! !0 c'rret2 te te tre-re"et" te irecti! i %ic 0!rce i" e,-eriece +$ te "a0t !0 te d

Str'ct'rall$ a c!"tr'cti! %i"e a irect c'rret !t!r i" e,actl$ "iilarDC eerat!r2 +'t electricall$ it i" 8'"t te !--!"ite. Here %e 'li/e a ee"'--l$ electrical eer$ t! te i-'t -!rt a eri#e ecaical eer$ 0r!'t-'t -!rt. 5e ca re-re"et it +$ te +l!c/ iara "!% +el!%.

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Here i a DC !t!r2 te "'--l$ #!ltae E a c'rret I i" i#e t! te electe i-'t -!rt a %e eri#e te ecaical !'t-'t i.e. t!r4'e T a "-eeecaical -!rt !r !'t-'t -!rt.

Te i-'t a !'t-'t -!rt #aria+le" !0 te direct current motor are rela-araeter K.

S! 0r! te -ict're a+!#e %e ca %ell 'er"ta tat !t!r i" 8'"t te !-e!ea !0 a DC eerat!r2 a %e ca eri#e +!t !t!ri a e!-erati! 0r! te "ae acie +$ "i-l$ re#er"i te -!rt".

T = KI and E=KW

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Detailed Description of a DC T! 'er"ta te DC !t!r i etail" let" c!"ier te iara +el!%2


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Te irect c'rret !t!r i" re-re"ete +$ te circle i te ceter2 ! %ic!'te te +r'"e"2 %ere %e c!ect te e,teral terial"2 0r! %e

#!ltae i" i#e. O te ecaical terial %e a#e a "a0t c!i !'t a c!ecte t! te arat're2 a te arat're*"a0t i" c!'-le t! te l!a. O te "'--l$ terial" %e re-re"et te arat're re"i"tace Ra i

let te i-'t #!ltae E2 i" a--lie acr!"" te +r'"e". Electric c'rret %ictr!' te r!t!r arat're #ia +r'"e"2 i -re"ece !0 te aetic 3el2t!r4'e T. . D'e t! ti" t!r4'e T. te c !t!r arat're r!tate". A" te ar

c!'ct!r" are carr$i c'rret" a te arat're r!tate" i"ie te "tat!aetic 3el2 it al"! -r!'ce" a e0 E+ i te aer #er$ "iilar t! t

eerat!r. Te eerate E0 E+ i" irecte !--!"ite t! te "'--lie #!lta

/!% a" te +ac/ E02 a" it c!'ter" te 0!r%ar #!ltae.

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Te +ac/ e0 li/e i ca"e !0 aeerat!r i" re-re"ete +$

E ; 1 O N ? A

5ere2 1 ; ! !0 -!le"

O ; :', -er -!le


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S! 0r! te a+!#e e4'ati! %e ca "ee E+ i" -r!-!rti!al t! "-ee @N7. T

%ee#er a irect c'rret !t!r r!tate"2 it re"'lt" i te eerati! !0 +alet" re-re"et te r!t!r "-ee +$ 9 i ra="ec. S! E+ i" -r!-!rti!al t! 9.

S! %e te "-ee !0 te !t!r i" re'ce +$ te a--licati! !0 l!a2 E+

T'" te #!ltae ierece +et%ee "'--l$ #!ltae a +ac/ e0 icrea"

ea" E E+ icrea"e". D'e t! ti" icrea"e #!ltae ierece2 arat'ricrea"e a tere0!re t!r4'e a ece "-ee icrea"e". T'" a DC M!t!

!0 aitaii te "ae "-ee 'er #aria+le l!a.

N!% arat're c'rret Ia i" re-re"ete +$

Ia ; E*E+=Ra

N!% at "tarti2"-ee 9 ; ? "! at "tarti E+ ; ?.

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Te #er$ +a"ic c!"tr'cti! !0 a c !t!r c!tai" a c'rret carr$i ari" c!ecte t! te "'--l$ e tr!' c!'tat!r "eet" a +r'"e-lace %iti te !rt "!'t -!le" !0 a -eraet !r a electr!*aet te iara +el!%. N!% t! ! it! te etail" !0 te operating principlemotor it" i-!rtat tat %e a#e a clear 'er"tai !0 6lei7" le0t eterie te irecti! !0 0!rce acti ! te arat're c!'ct!r" !0 c

6lei7" le0t a r'le "a$" tat i0 %e e,te te ie, 3er2 ile 3t'+ !0 !'r le0t a i "'c a %a$ tat te c'rret carr$i c!'ct!r iaetic 3el (re-re"ete +$ te ie, 3er) i" -er-eic'lar t! te ic'rret (re-re"ete +$ te ile 3er)2 te te c!'ct!r e,-eriecete irecti! (re-re"ete +$ te t'+) 't'all$ -er-eic'lar t! +!t t!0 3el a te c'rret i te c!'ct!r.

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6!r clear 'er"tai te principle of DC motor %e a#e t! eteriait'e !0 te 0!rce2 +$ c!"ieri te iara +el!%. 5e /!% tat i3itel$ "all care 4 i" ae t! :!% at a #el!cit$ @#7 'er te i:'eelectric 3el E2 a a aetic 3el B2 te te L!ret 6!rce 6 e,-eriecare i" i#e +$*

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Where dL is the length of the conductor carrying charge q.

6 ; 4(E V+)

6!r te operation of dc motor2 c!"ieri E ; ?

6; 4F#FB

i.e. it7" te cr!"" -r!'ct !0 4 # a aetic 3el B.



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6r! te "t iara %e ca "ee tat te c!"tr'cti! !0 a DC !t!te irecti! !0 c'rret tr!' te arat're c!'ct!r at all i"ta-er-eic'lar t! te 3el. Hece te 0!rce act" ! te arat're c!irecti! -er-eic'lar t! te +!t 'i0!r 3el a c'rret i" c!"t

So if we take the current in the left hand side of the armature con

I, and current at right hand side of the armature conductor to be −they are flowing in the opposite direction with respect to each otheThen the force on the left hand side armature conductor,

Similarly force on the right hand side conductor

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5ere i" te ale +et%ee te -lae !0 te arat're t'r a tre0erece !r te iitial -!"iti! !0 te arat're %ic i" ere al!aetic 3el.

Te -re"ece !0 te ter c!" i te t!r4'e e4'ati! #er$ %ell "i0!rce te t!r4'e at all -!"iti! i" !t te "ae. It i 0act #arie" %itte ale . T! e,-lai te #ariati! !0 t!r4'e a te -rici-le +e

te !t!r let '" ! a "te- %i"e aal$"i".



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Step 1 Iitiall$ c!"ieri te arat're i" i it" "tarti -!it !r re0e%ere te ale ; ?.

Since ! ", the term cos ! #, or the ma$imum %alue, hence torqueposition is ma$imum gi%en by & ! 'ILw. This high starting torque helpo%ercoming the initial inertia of rest of the armature and sets it into ro


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Step ! Oce te arat're i" "et i !ti!2 te ale +et%ee te -!"iti! !0 te arat're a it" re0erece iitial -!"iti! !e" ! icre-at !0 it" r!tati! 'til it +ec!e" J? 0r! it" iitial -!"iti!. C!"e4ter c!" ecrea"e" a al"! te #al'e !0 t!r4'e.

Te t!r4'e i ti" ca"e i" i#e +$ ; BIL%c!" %ic i" le"" ta BILreater ta ?.


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Step " I te -at !0 te r!tati! !0 te arat're a -!it i" reaceact'al -!"iti! !0 te r!t!r i" e,actl$ -er-eic'lar t! it" iitial -!"itJ?2 a a" a re"'lt te ter c!" ; ?.

Te t!r4'e acti ! te c!'ct!r at ti" -!"iti! i" i#e +$2


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i.e. #irt'all$ ! r!tati t!r4'e act" ! te arat're at ti" i"tacearat're !e" !t c!e t! a "ta"till2 ti" i" +eca'"e !0 te 0act t!-erati! !0 c !t!r a" +ee eieere i "'c a %a$ tat te i!ti! at ti" -!it i" 8'"t e!' t! !#erc!e ti" -!it !0 'll t!r4r!t!r cr!""e" !#er ti" -!"iti! te ale +et%ee te act'al -!"iti!

arat're a te iitial -lae aai ecrea"e" a t!r4'e "tart" actaai.
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dc motor.pptx

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