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传统的电力机车、地铁、无轨电车等均用直流电动机牵引,由交流单相高压供电,经牵引变压器降压、整流、调压给直流牵引电动机供电,称为交-直传动系统。内燃机车和工矿电力机车也是由直流电动机组传动,这些均采用变阻调速,统称为变阻电动车。内燃机车的辅助系统也是三相交流传动。供电系统由主传动的高压“交-直-交”的中间直流环节直流供
Conventional electric locomotives, subways, trolleybuses and the like are all towed by a direct current motor. They are powered by AC single-phase high-voltage power supplies and are stepped down, rectified and regulated by traction transformers to supply DC traction motors, which are called AC-DC transmission systems. Diesel locomotives and mining power locomotives are also driven by the DC motor, these are used variable resistance speed, collectively referred to as variable resistance electric vehicles. Auxiliary systems for diesel locomotives are also three-phase AC drives. Power supply system driven by the main high-voltage “AC - DC - AC ” DC link DC