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全面介绍了EF66电力机车上所使用的MT56型牵引电动机的故障情况，同时着重分析了占比重最大的环火故障，并就其主要原因及防止措施进行了广泛研究。
The fault condition of MT56 traction motor used on EF66 electric locomotive is introduced in an all-round way. At the same time, the ring fire fault with the largest proportion is analyzed emphatically, and the main reason and preventive measures are extensively studied.