一、仍采用直流发电机的接线法发生这种错误时(见图1),发电机仍可以工作,但有两个缺点。一是早上初发动车时,中、低速运行发电机不发电,其原因是交流发电机的磁极剩磁微弱,在中、低速运转时,仅靠磁极的剩磁在定子绕组中产生的感应电动势不能克服硅整流管的管压降,因而不能建立自激激磁电流,因此发电机不发电。正确接线时(见图2),当 First, still using DC generator wiring method such errors (see Figure 1), the generator can still work, but there are two shortcomings. First, the first car in the morning, the medium and low speed generator does not generate electricity, the reason is that the alternator pole remanence weak, at low speed operation, relying solely on the magnetic pole in the stator windings induced electromotive force Can not overcome the silicon rectifier tube pressure drop, and therefore can not establish self-excited magnetic current, so the generator does not generate electricity. Correct wiring (see Figure 2), when