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引言交通运输技术对各国日益重要,尤其火车有重大发展前景,这就增加了对铁道技术性能及其经济指标的要求。现代的大功率电子装置可使这种驱动系统得到实现,它可使技术性能和经济指标均比沿用的驱动系统优良。下面叙述采用异步电动机的DE2500型电传动内燃机车。这种机车的功率由其牵引力与速度之间关系特性确定。图1为三种不同的功率时的牵引力与这度的关系曲线。最大牵引力的极限曲线(P_n=1350瓩)有两段,低速范围的极限由机车本身重量及车轮和轨道间摩擦所产生的最高运转牵引力来确定。机车的最大重量与车轴数及轨道可允许的最大轴重有关。更高速度
Introduction Transportation technology is increasingly important to all countries. In particular, railways have major development prospects, which increase the technical performance of railways and their economic requirements. Modern high-power electronics enable this drive system to deliver both technical performance and economic advantages over the drive system used. The following describes the use of asynchronous motor DE2500 electric drive diesel locomotive. The power of such locomotives is determined by the relationship between traction and speed. Figure 1 shows the relationship between traction and this degree at three different power levels. The limit of maximum traction (P_n = 1350 瓩) has two sections. The limit of low speed range is determined by the maximum running traction generated by the weight of the locomotive and the friction between the wheel and the track. The maximum weight of the locomotive is related to the number of axles and the maximum permissible axle load. Higher speed