中文摘要：

提出一种永磁同步液压电机泵模型，即把永磁同步电机转子作为液压泵缸体，以进一步提高液压传动的整机效率．通过控制电机转速直接调节泵的输出流量，使电机泵提供的功率与负载匹配，从根本上提高液压调速系统的效率．同时建立了该液压电机泵变速控制系统的数学模型．针对永磁同步电机非线性、多变量、强耦合的特点，将模糊和滑模控制理论运用到永磁同步电机直接转矩控制中，以提高系统的鲁棒性和快速性．对转速阶跃变化进行仿真研究，仿真结果表明该策略具有良好的鲁棒性和快速性．

英文摘要：

In order to enhance the whole efficiency of hydraulic drive system, a novel hydraulic motor pump model that the rotor is used for hydraulic pump body is proposed. To make the motor afforded power match the load demanded power and fundamentally improve the efficiency of hydraulic speed regulating system, the output flow of hydraulie pump is adjusted directly by regulating speed of motor. The model of hydraulic motor pump variable speed control system is built. Considering permanent magnet synchronous motor is a nonlinear, multivariable and coupled uncertain system, fuzzy con- trol and sliding mode control strategy are applied to permanent magnet synchronous motor direct torque control to enhance the robust and fast. Under the condition of drastically changed speed, the simulation is performed well. Results show that the suggested method is robust and fast.