Industrial Automation 05 Induction Motors

Click here to load reader

  • date post

    29-Nov-2014
  • Category

    Documents

  • view

    93
  • download

    0

Embed Size (px)

Transcript of Industrial Automation 05 Induction Motors

5 5.1 , (induction motor), . , 60% , . , , . , . . N. Tesla 1880. , 1896. 1970, , , . 100hp, 7.5hp 1897. , 1973, . , , (high efficiency induction motors). , , . . 5.1. . 5 52 . 5.1 . LeroySomer 5.2 : (synchronous) . , , . , , . , , . , . , . . , , . 5.3 , . (salient poles). To , , . , . . 5 53 . 5.2 , , , , . , . , . , (salient pole rotor), . , . , . . , , . 5.2. , . , . , . . , , . 5.4 , , . , . 5.3, ( ). (. 5.3). , 120, . as, bs, cs, , . , . (coil sides), (slots), (span) 180 . , , . 5.3. , . 5.3. a4, b4 c4 , . . 5 54 as bs csa'1a'2a'3a'4c1c2c3c4b'1b'2b'3b'4a1a2a3a4c'1c'2c'3c'4b1b2b3b4sa1a'1a2a'2a3a'3a4a'4iasAb1b'1b2b'2b3b'3b4b'4ibsBc1c'1c2c'2c3c'3c4c'4icsCn()() . 5.3 , (), () . 5.3, , , 60. , . , . , . . 5.3 fullpitch, 180 ( ). , 180, fractionalpitch. . 5.4 . as . , . 5.4 , as. as . , . 5 55 . , . bs (MEbs) as, 120 . , MEcs 240 as. as, bs, cs, . , s . , , . , , . 5.5. , . 5.5 , as cos2sas as sNi = (5.1) ias as Ns , . bs cs, cos( 2 / 3)2sbs bs sNi = (5.2) cos( 2 / 3)2scs cs sNi = + (5.3) , , | | cos cos( 2 / 3) cos( 2 / 3)2ss as s bs s cs sNi i i = + + + (5.4) as bsa'1a'2a'3a'4c1c2c3c4b'1b'2b'3b'4a1a2a3a4c'1c'2c'3c'4b1b2b3b4s cs as2as0 . 5.4 , as . 5 56 , cos( )as ms ei I t = (5.5) cos( 2 / 3)bs ms ei I t = (5.6) cos( 2 / 3)cs ms ei I t = + (5.7) e . . (5.5)(5.7) . (5.4), ass ass as /2 3/22 0as s /2 ()() . 5.5 as () () . 5 57 3cos( )2 2ss ms e sNI t = (5.8) . (5.8) , e , . . , , . . 5.6. , . 5.3. , ( ) . 5.6 . 5.3. . 5.6 , , 60. ABC. 60 60 , .(5.8). , (). a'abb'cc'A B Ca'abb'cc'a'abb'cc'a'abb'cc'a'abb'cc'a'abb'cc'a'abb'cc'it/30a', b', c'+iA,B,Ca, b, c`) 2 . 5.6 (C). , , . 5 58 as1as'1bs'1cs1cs'1bs2as'2cs2as1cs'2bs1 sas1as'1iasAbs1bs'1ibsBcs1cs'1icsCn()()as2bs'2 bs1 cs1 as2 bs2 cs2as2as'2bs2bs'2cs2cs'290o . 5.7 , . 5.7 . , . . (span) 90. , 3cos2 2ss ms e sN PI tP = ` ) (5.9) /( / 2)eP . . . . 5 595.5 , : (squirrel cage rotor) (wound rotor). . , . , . , . (classes) , , . , (shorting rings). , . , . , , . , , . , , . (. 5.8). () . 5 510 () . 5.8 . () : 1 , 2 , 3, 4, 59, 67 , 8, 10 . () , , . . , . , . , . 5.6 , Rs, Lst ws (. 5.9). u e, s . sr ( , mutual flux), . ls (leakage flux) . . 5 511 . , . s ls sr = + (5.10) , , . , . , . ( sr ) , Er. , . Rr, Lrot wr . , Ir Er. . 5.9 . , , r . rs , . rIrErBrsBsrBmRsuisirRrLstwsLrotwrlslrsrrs . 5.9 . 5 512 lr . , r lr rs = + (5.11) . 5.9. m , m sr rs = + (5.12) , , . 1( )e sr rsT C = B B (5.13) 2( )e m rsT C = B B (5.14) sin cose T m rs T m rs rT C B B C B B = = (5.15) . , . , . , (singly excited). , , , (doubly excited). 5.7 , 2e ef = P, . (5.9). ns rpm 60 120/ 2e esf fnP P= = (5.16) , . , , . , , , . , . . 5 513 nr ns (slip speed) slip s rn n n = (5.17) (slip) 100%s rsn nsn= (5.18) , (s = 1). , (s = 0). . (5.18) , (1 )r sn s n = (5.19) , , . 5.8 . , . , (rotating transformer). , . 5.9, s rs s stdi diu R i L Mdt dt= + (5.20) 0s rr r rotdi diR i L Mdt dt= + (5.21) . , . (5.20) (5.21) s s e st s e rV R I j L I j MI = + (5.22) 0r r e rot r e sR I js L I js MI = + (5.23) , (). . 5 514RsImIsV RrwswrEIrIrrrswE sEw=_+_+ls e lsX L =m e mX L =lr e lrsX s L = . 5.10 , . 5.10 , , . , , (). , fr , . (5.23) r ef sf = (5.24) , . , . . , , 0rn = , 1 s = ( 0 s ). . (5.22), (5.23) , , ( ) ( )s ls s m s rV R jX I jX I I = + + (5.25) 0 ( ) ( )rlr r m r sRjX I jX I Is = + + (5.26) . (5.25)(5.26), , : Xls , ls ( )sls e strwX L Mw = (5.27) Xlr , lr ( )rlr e rotswX L Mw = (5.28) Xm , . 5 515 sm erwX Mw = (5.29) , ws/wr, : 2sr rrwR Rw| | = |\ . (5.30) 2slr lrrwX Xw| | = |\ . (5.31) rr rswI Iw| | = |\ . (5.32) ls m e stX X L + = (5.33) lr m e rotX X L + = (5.34) , . (5.25)(5.26), . 5.11. , e. /lr rX R s + , . . 5.12 (phasors), . , . , . 5.9 , . RsIsIrImls e lsX L =lr e lrX L =Vm e mX L =E/rR s . 5.11 . . 5 516Rr IrIrErImlr rsX IIsIrERs IsXls IsVrsrrsm . 5.12 , , , . , . , : (copper, winding losses). . 2_3cu s s sP R I = (5.35) 2_3cu r r rP R I = (5.36) _ _ cu cu s cu rP P P = + (5.37) Is Ir, . 3340% 1522% , . (core, iron losses). . m . 5 517 , . 2 2_niron s e e m h e mP k k = + (5.38) 2 2_( )niron r e e m h e mP k s k s = + (5.39) ke kh . n 1.5 2.5 n = 2. , 2 2 2_(1 ) (1 )iron s r e e h e mP k s k s + ( = + + + (5.40) , se. , 20%. . 5.11, Rm . , 2_ iron s rmEPR+ = (5.41) . (5.40) e mE = , 21(1 ) (1 ) /me h eRk s k s =+ + + (5.42) (mechanical losses). Pfw, (friction), (windage) . , 2fw fw rP C n = (5.43) , Cfw . 810% . (stray losses). , . Pstray . , 1