В'С' = I 1N. X b o ld ing ig a nis batan kattar oq boMadi
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Tashqi va rostlash xarakteristikalari (1)
В'С' = I 1N.x b ) o ld ing ig a nis batan kattar oq boMadi. No a y o n q utb li s inx r on ma s hina la r da xp«( l, 0 5 + l,l) x ltj, ayon qutbli s inx ron ma s hina la r da esa xp » ( 1,1 ч- 1 ,3 ) x 1 ct . 20.3. Tashqi va rostlash xarakte ris tikalari T ashqi x arak te ris tik alari. Bu x arakte r is tikalar q o ‘zg ‘atis h toki I = cons t, f = cons t (de ma k, aylanis h chas totas i n = n N = cons t) va coscp =cons t boMganda ge ne ratorning chiqis h kle mmalar idagi kuchlanis h U, ning y ukla ma to ki I, ga bogMiq h o ld a o ‘zgar is hini k o ‘rs atadi, ya’ni u , e /*(!,)- S G nin g tas hqi x ar akte r is tikalar i y uk la m a n in g xar akte riga qarab har xil boMadi. 20.2- ras mda ge ne r ator ning bu x ar akte r is tikalar i uc h xil (aktiv, aktiv- induktiv va aktiv- s igMmiy) xarakte rli yukla malar ga te gis hli costp u c h un k o ‘r s atilgan. A k tiv - induk tiv (ц> > 0) y ukla ma d a m a s h in a yakor re aks iyas ining b o ‘yla ma o ‘q b o ‘y ic ha ma gnits izlovchi t a ’siri tufa yli yakor t o k ining ortis hi b ila n S G c hiqis h kle mma s idag i k uc hla nis h ka ma y a di (b und a E0 > U ,) , ak tiv - s ig ‘im iy (y < 0) y u k la m a d a es a y a ko r r e aks iyas i m a s h in a ning b o ‘y la m a o ‘qi b o ‘yicha m a g n itlo v c h i t a ’sir k o ‘r s atadi va Ij to kning or tis hi b ila n kuc hla nis h h a m or t a di (b und a E 0 < U j). S o f aktiv (ф = 0) y ukla ma d a esa yakor reaksiyas i m a s h in a ning k o ‘ndala ng o ‘qi b o ‘yicha t a ’sir qilib , b o ‘ylama o ‘qi b o ‘yic ha y o ‘nalgan asosiy magnit o q im in i de for ma ts iy a la y di, y a’n i u n in g q utb o ‘qiga nis ba ta n s imme tr ik taqs imlanga n s haklini buza di (bu holda bur c ha k у > 0 boMadi). Na tija da r otor ning aylanis h y o ‘nalis higa bogMiq ho lda qutb o ‘qinin g bir to m o nid a ma gnit ma y d o n s us ayadi, ikkinc hi t o m o n id a esa kuc ha y ad i va ma s hina ma gnit za n jir in in g bu qis mi ma g nit jih a t d a n t o ‘y ina di. Bun d a m a s h in a n in g b o ‘y lam a o ‘qi b o ‘y ic ha y o ‘na lg an nat ija viy m a g n it o q im i n is b a t a n k a m a y a d i, d e m a k , bu h o ld a ham y a ko r r e a ks iy a s ining m a g n it s izlo v c h i t a ’s iri m a s h in a n in g b o ‘y la m a o ‘qi b o ‘yicha bo Mar e kan. S h u n in g u c h un y ukla ma toki I,n in g ortis hi b ila n kuchla nis h ka ma y a d i (E 0 > U , ) . Agar S G nin g tas hqi x ar akte r is tikas ini tajr iba da olis hda n o m in a l yukla ma ( I, = I1N)d a n s alt is hlas h r e jimig a cha ka ma y tir ib olins a, yakor reaksiyasi t a ’s ir ining ka ma yis hi tufa yli (a ktiv — ind uk tiv (p < 0) va aktiv (ф = 0 ) boMgan y ukla ma la r d a) kuc h la nis h os hadi ( U 0 > U 1N), agarda tas hqi x ar akte ris tikani tajr ibada olis hda y ukla ma ni no mina lg a c ha os hir ib olins a u n d a kuc hla nis h AU ga ka ma y ad i. U n in g kattaligi foizda 2 3 7 20.2- ras m. Sinx ron generatorning y uklam asini kamay tirib olingan tashqi (a) va y uklamasini oshirib olingan ros tlas h (b) x a r a k t e r is t ik a la r i (bularda: (p = 0 — aktiv, (p> 0 — aktiv- induktiv va (p < 0 - ak tiv - s ig‘im iy x arak te rli y uk lam alarga xos. quyida gic ha a niqla na d i: A U , = [ (U0 - U 1N) / U 1N] .1 0 0 . (20.19) Oda tda S G lar coscp = 0,85+ 0,9 bila n kuchla nis hda n orqada qoluvc hi tokda is hlaydilar . Bu ho ld a AU = 20+ 30 % b o ‘ladi. Is te ’m o lc h ila r n o m in a l kuc hla nis h U N va unga y a qin kuc hla nis h b ila n is hlas hi u c h u n S G q o ‘zg ‘a t is h n i a v t o m a t ik r os tlas h q u r ilm a s i b ila n t a ’m in la n ib , kuc hlanis h r os tlanib tur ila di. Download 308.34 Kb. Do'stlaringiz bilan baham: |
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