:
1. .
2. .
3. .
4. .
, r L, : , Q () S, I U.
S = U × I. (1)
: Ia = I × cos j, U, ; Ip = I × sin j, 90, (1)
(2)
, Q,
(3)
(3) . Q, .
, , j.
(4)
, P = UI cos j, , q = UI cos(2 wt + j), ( ) (. 1). (3) (4), , , .
. 1. , |
(5)
(5) , . . - , , ( ).
, .
, D U, D , ( 3- )
(6)
(7)
|
|
(8)
, ,
(9)
(9) . , , ,
(10)
, , I ,
cos j . tg j = Q/P, .
D P tg j (cos j) , (8) 2. ()2
(11)
, (1 )2 , (1 )2 . cos j ( tg j) - , , , , .
(11), , (r = const) U, : 1) Q = const; 2) .
. , -, ( ); , . .; -, () .
, 90 ().
(12)
Q , w = 2p f = 314 ( f = 50 ), U , , .
Q
(13)
, , , .
, , : 60 %, 20 %, , , 20 %.
. .
1. , , .
: = 1,0 ; U = 380 ; I = 2,4 ; cos j = 0,79; h = 78,5%; n = 1450 /.; I = 5 × I .
2. , b,
|
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, ; ; n , ,
h , (. 2).
. 2. , |
3. () cos j , , .
4. .