直流发电机的工作原理就是把电枢线圈中感应的交变电动势，靠换向器配合电刷的换向作用，使之从电刷端引出时变为直流电动势的原理。-The working principle of DC generator armature coil is sensitive to the alternating electromotive force, by the commutator with brushes for the role, so that leads from the brush end into