. . . , . .

sac_13_1.gif

, . 1. , .

, 0. , , .. s. , . , . . , . , .


, , . , ( iF . 2), , , .

sac_13_2.gif

, , , . , .

. (. 2), .. , . , , .. . , , .

. , . -, IF2r, IF - , r - , . , . (. 2). .

, .

sac_13_3.gif

l, h d (. 3) l. B dx, x .

h >> d, , x, x = 2xhB, , dx - Ex = 4kf fx max = 8kf fhxBm2, kf - . dx , , ( d) , image267.gif, g - . , PF ,

image268.gif

(1)

(1) ,  ( )

, .

x , .


, . ,

WH` = h Bmn ,

h - , , Bm - n - , . 0.1< Bm <1.0 n = 1.6, 0.1 > Bm 1.0< Bm <1.6 n = 2.

, , ,

PH = WH`fV = h fBmnV .

(2)

, .. PFe = PF + PH. , Bm, , , " "

PFe = (h f+x f2)Bm2V

(3)

sac_13_4.gif

PF PH . 4. , , , . , .. , . , , .


. B(H) Y (i), , Y = BS i = H/w.

u = Umcosw t, image269.gif . , Y (i) (. 5).

sac_13_5.gif

Y Y (i) i ab, .

i(t) . . i1 (. 5) , , , . , .. . , , .

i, i(Y ) Y (t), , , u(t) (. 6).

sac_13_6.gif

. 6 , . , .


, . , , ..

u = Umcosw t; Y = Y msinw t; i = Imcos(w t- φ ) .

i u φ , cosφ =PFe/(UI), , .. u = dY /dt.

i - Imsinw tsinφ = Imcosw tcosφ .

i2 - 2iImsinw tsinφ + Im2sin2w tsin2φ = Im2cos2w tcos2φ

, Im2sin2w tcos2φ , , sinw t = Y / Y m,

image270.gif.

. , Y (i) , .

sac_13_7.gif

Y (i) . 7 ) ).

, , . , φ . Y (i) . , Y (i) . Y (i) . Y (i) .


.

=msinw t, e = - d/dt 90° , u0 = - e - . I . x0 = U0/I L0 = x0/w (. 8 )).

sac_13_8.gif

I, 90° . - I = PFe/U0 ; r = U0/I . j ,

cosj = sina = PFe/(U0I0) ,

a = p /2- j , .. . , x0 L0 I0 . . 8 ).

r . , , .. s, . , .

r ur = ri0, i0. uLs = Lsdi/dt Û ULs = jxsI0 i0 90° , xs Ls. , , , , .

. 8 ). r , r0 - . Ls s, L0 - 0.

, . 8 a rI0 jxsI0 , .. U.


, , , , , , , 70% " ", 30% - , . .
- , - . , . - , . . , , - . 100%. , . FAQ .




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