◇他励直流电动机的调速 u=En+lR En=C MD=COLd →lD= Ceon+ MORE MR CbCC2(电动机的机械特性) △ MR M❖他励直流电动机的调速 = = = + D M D D e D D D M C I E C n u E I R = + R C M u C n M D D e 即 n n C C M R C u n e M D e D = − = − 0 2 (电动机的机械特性) e D C u n0 = 2 e M D C C M R n =