1.前言用异步电动机作为牵引电动机的电力传动内燃机车,最近已广泛地为人们所熟知,而且一部分国家,例如瑞士联邦铁路、西德联邦铁路等也正在使用之中。这种方式由于牵引电动机没有整流子,所以构造简单,维修和可靠性等方面都非常理想。但是,为了实现高效率输出,必需调节电压和频率。因此,当发动机驱动的作为电源用的牵引发电机是交流时,要产 1. Introduction Power-driven diesel locomotives with asynchronous motors as traction motors have recently become widely known and some countries, such as the Swiss Federal Railways and the West Federal Railways, are also being used. In this way, the traction motor has no commutator, so the structure is simple, and the maintenance and reliability are all very good. However, in order to achieve high efficiency output, it is necessary to adjust the voltage and frequency. Therefore, when the engine-driven traction generator used for power supply is AC, it is necessary to produce