中文摘要：

为了提高感应电机效率，研究一种高效永磁感应电机。在分析永磁感应电机结构和工作原理的基础上，采用同步旋转坐标系建立永磁感应电机的数学模型。对永磁感应电机的稳态功率特性进行深入分析，研究定子磁链在不同扇区时，电压矢量对电机有功功率与无功功率的影响，从而得到了适用于永磁感应电机直接功率控制的矢量开关表，提出适用于该电机的直接功率控制策略。最后通过仿真验证了所提控制方法的有效性与正确性。永磁感应电机直接功率控制以零无功功率为控制目标，在不影响有功功率输出的前提下，把无功功率限制在零附近波动，从而提高了电机运行的效率和功率因数。

英文摘要：

In order to improve the efficiency of induction motor, a high efficiency permanent magnetic in- duction motor （PMIM） is studied. Firsdy, the structure and the basic working principle were analyzed, and based on the rotating coordinate system, the mathematical model of PMIM was established, and the steady-state power performances were deeply studied. Then, according to the steady-state power charac- teristic of the PMIM, the effects of different voltage space vectors on active power and reactive power in different areas were analyzed, and the vector switch table of the direct power control （DPC） was estab- lished. Direct power control strategy was proposed to be applied to the PMIM. Finally, simulation and a- nalysis were carried out, and the results verify the correctness and effectiveness of the theory of the DPC on PMIM. The method is to control reactive power as zero and greatly improve PMIM power factor and ef- ficiency at the same output of active power.