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f目录
1绪论111选题背景与意义112课题研究意义213设计任务和要求32系统组成及基本原理521直流调速系统的调速原理522双闭环调速的过程和工作原理623双闭环直流调速系统的组成724主电路图725H桥可逆PWM变换器926保r