院本文针对ZD105型、ZD115型、ZD120型牵引电机调速进行研究、比较，发现机车调速操纵由复杂向简单过度，但机车牵引电机控制系统越来越复杂，并且向自动化方向发展。%This article takes comparison and research in view of type ZD105, type ZD115, type ZD120 traction motor speed control, and finds that the locomotive speed control from complex to simple, but the locomotive traction motor control system is more and more complex, and develops in the direction of automation.
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