.
a=Bm sin(wt) b=Bm sin(wt-1200) c=Bc sin(wt+1200)
eja=cosa+jsina e-ja=cosa-jsina sina=(eja-e-ja)/2j
a= ((ejwt- e-jwt)/2j)*Bm b= ((ej(wt-120) - e-j(wt-120))/2j)*Bm
c= ((ej(wt+120)- e-j(wt+120))/2j)*Bm
B !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Ba=Ba Bb=Bb*e -j120 Bc=Bc*ej120
B = Ba+Bb+Bc = Bm [( (ejwt- e-jwt) /2j ) + ( (ej(wt-120)- e-j(wt-120))e-j120/2j ) + ( (ej(wt+120)- e-j(wt+120)) ej120 /2j )]=
= Bm / 2j [ ejwt e-jwt + ej(wt-240) - e-jwt + ej(wt+240) - e-jwt ] = (-3/2) e-jwtBm=(3/2) e-j(wt-90)Bm
=0
- 3Bm/2; - w.
- , , p, p , p .
40. . .
3
1- 2- 3- 4- 5-
.
n0- , .. . .
n0= f 1/p, - , p- .
, , , . , , , .
- , , . , . .
- .
, , .
S=n0-n/n0 n0 , n .
n0=f1/p,f1 , n
S=1-n0/n --> n=n0(1-S)
0 1
S=0: ;
S=1: , .
f2, f1.
f1 = n0p f2 = nSp ((=)) nS=n0-n, nS .
((=)) (n0-n)p=(n0-n(1-S))p=n0Sp=f1S
42. . . .
|
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E2 = E1e, E2 E1
e -
1 =4.44 mw11f1
1 - , .
2 =4.44 mw22f1 -
2S = 4.44 mw22f2 = 4.44 mw22f1*S = E2S
Ů1=E1 +r1Í1+jx1Í1 É2 =r2Í2+jx2SÍ2 x2=x1/S x2S=2pf2L=x2S É25 =r2Í2+jx25SÍ2
SÉ2 =r2Í2+jx2SÍ2 SE2¢ =Í2 r2¢+jx2¢SÍ2¢ -
É2¢ =Í2¢ r2¢/S+jx2¢Í2¢=Í2¢((1-S)/S)r2+Í2¢r2¢+jk2¢Í2¢
P=I22r2¢((1+S)/S) -,
P=3(I2¢)2r2¢((1+S)/S);
M=P/Ω; Ω -
Ω=2pn=2p(1-S)n0 = (f1/p)2p(1-S) = w0(1-S)/P0
M= ( 3(I2¢)2r2¢((1-S)/S)P ) /w0(1-S)=3(I2¢)2r2¢P/w0S {=}
I1= I2¢=U1/ Ö( r1+r2¢/S)2+(x1+x2¢)2 ) (=) xk=x1+x2¢ r1<<r2¢/S (=) U1/ Ö( (r2¢/S)2+xk2 )
{=} 3U12r2¢P/[(r1¢/S)2+xk2]w0S
. . -
M=3U12r¢P/[(r1¢/S)2 +xk2] w0S
, xk
- -, -. , - . . . - 0;
- : dM/dS=0, S=r2¢/xk
- - . ( ).
KN , .
: dM/dS>0 : dM/dS<0
- -
=I/I=1.7¸3.4 - ;
=I/I=6¸7 - ;
.