U1=J(XL+XM)I=j(a +oM/ U2=j(X2+Xm)l=j(a+al)/ U=U1+U2=jo(L1+L2+2M)I=(X1+X2+2XM) 2)反接 L d i dt a=1+l2=(L1+L2-2M)x=L dt dt ∴等效电感L=L1+L2-2M 2.并联 l)同侧(同名端相联) 2 1 jal212+ jaMI, =1+2 Z=-=jo LL-M L,+L、-2M 等效电感L 2)异侧(异名端相联) I1 2 jwL6 U j X X I j L M I U j X X I j L M I L M L M · · · · · · = + = + = + = + 1 1 1 2 2 2 ( ) ( ) ( ) ( ) w w w w · · · · · U =U +U = j L + L + M I = j X + X + X I L L M ( 2 ) ( 2 ) 1 2 1 2 1 2 w 2) 反接 u L di dt M di dt u L di dt M di dt 1 1 1 2 2 2 2 1 = - = - ì í ïï î ï ï dt di L dt di u = u1 + u2 = (L1 + L2 - 2M ) = 反 等效电感L反 = L1 + L2 - 2M 2 并联 1) 同侧(同名端相联) U j L I j M I U j L I j M I I I I · · · · · · · · · = + = + = + ì í ï ï î ï ï w w w w 1 1 2 2 2 1 1 2 L L M L L M j I U Z 1 2 2 2 1 2 + - - = = · · w 等效电感 L L M L L M L 1 2 2 2 1 2 + - - = 2) 异侧(异名端相联)