针对外环流活塞泵运转时出现的汽蚀、震动问题，从理论上分析了转子型线与闭死容积、流速变化和发生汽蚀的内在关系；
To the problem of cavitation and shock that appears in the outside circulation piston pump running, the relation-ship between rotor profile and dead volume, flow rate and cavitation were analyzed.
根据外环给定电磁转矩的不同，调整内环转子磁链给定值，以达到能量优化控制的目的。
According to the inner rim rotor flux linkage given value can reach the purpose of the energy optimization control.
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