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介绍了平衡式复合齿轮泵（马达）的工作原理，分析了复合齿轮泵流量特性，在此基础上设计出差动轮系式复合齿轮泵变量系统，并进行了分析。
The working principle of the balanced compound gear pump (motor) is introduced. The flow characteristics of the compound gear pump are analyzed. Based on the analysis, the variable gear system of the compound gear pump is designed and analyzed.