Gio trnh My đin Trang 39    I. ĐA ̣ I CƯƠNG:    :         .    _______________________   _______________________ song song  _______________________      II. MƠ ̉ MA ́ Y ĐÔ ̣ NG CƠ ĐIÊ ̣ N MÔ ̣ T CHIÊ ̀ U: n = 0  n  . :  D      .            .                               . 1.       :     : U = E  + I  R   I  = mm ö ö I R EU   K     = 0 , E  = 0  ö mm R U I    (       )                         .            (               ),          (4  6) I  . 2. Mơ ̉ ma ́ y bằng biến trơ ̉ :               ,   ,         .      ,             1,     ,                      (R  = 0) nên dây                                  - F i + I I t I  MF  + - I I t I  U M CD M R  a b 1 2 3 4 5 U - + Gio trnh My đin Trang 40   ( =  max   ,          I mm ,    . Khi I mm (1,1  1,3) I  = I mm2       2.  , 1            mm (I mm ) ,     .    mm ,        .       3, 4, 5.  5          . I mm2 . 0 )MM( dt dw .JM CÑñl M  :      M C : moment  3. :  =U  .            . III. ĐC TNH CA ĐNG CƠ ĐIN MT CHIU: 1.         :  E öö EE öö E ö C RI C U C RIU .C E n    M = C M . .I  nn CC MR C U n ME ö E  0 2                          a) ng n = f(t)      I = f(t) I 0 t 2 t 1 t 3 t 4 t 5 t M U + - A B C + - U kt ñm ö mm UUvôùi R U I   1 1 n 0 :         . n:       . Gio trnh My đin Trang 41  : () 2  ME ö E CC MR C U n  U = const , I t = const k MR nn ö  0 k:  Do R   0            t                                (,)           :                     .           kt , ( 3  5)%I     R    .                     . Khi R   I kt    E  = C  . . n ö ö ö R EU I    M > M   n E   I  . .( M  = C M ..I  )             . ,                       ( =  max )               ,                              . n n n 0 n  0 0 n = f(M) M  M M c M c = const n 0 n 03 n 02 n 01 M  2 <  1  1 <     - M U + I I t I  R  Gio trnh My đin Trang 42                   :                                    ,  .                         .              :                                             .  Khi U , n0         . b) : I.K    (do I t = I  = I) M MM C K.M K .CI CM       2   K.C R M.K U.C n E ö M                            .   .  Khi không ( I = 0 , M = 0)           .            2 = (0,2  0,25)P  .                              .          :        :                          .        . n n 01 n 02 n 03 M = const U  U 1 < U  U 2 < U 1 M 0 M 0 n 0,25 n = f(M) M R  R f I I  U Gio trnh My đin Trang 43      : n,   <             .          , n. (<  ,          .)       , = I t  ,    .          .  R t                                   .       :         c) :     2  .     (M C )I nt ( nt    ssong )    = ( ss -  nt ) n.  Khi M C I nt   =  ss +  nt (  )  n 2. : M R shunt C kt U + - M C kt U + - M C kt U + - R shunt M 0 n        Gio trnh My đin Trang 44 P 2 0 K/ K/     K/t song song K/t song song K/     K/ M = f(P 2 ) n = f(P 2 ) . _______________________      II. MƠ ̉ MA ́ Y ĐÔ ̣ NG CƠ ĐIÊ ̣ N MÔ ̣ T CHIÊ ̀ U: n = 0  n  . :  D                 . III. ĐC TNH CA ĐNG CƠ ĐIN MT CHIU: 1.         :