中文摘要：

为了提高三次谐波注入式五相永磁同步电动机的转矩密度,通过理论推导及有限元分析方法,提出了在定子电流幅值不变的前提下,使转矩密度达到最优的三次谐波注入率优选方法。通过五维空间矢量解耦变换,得到了2个二维正交子空间d1-q1和d3-q3下的数学模型,并设计了双空间矢量控制系统,以实现对基波和三次谐波分量的解耦控制。设计了一台气隙磁场为梯形波的五相永磁同步电动机样机及其五相电压源逆变器驱动系统,在单片XC3S1200E型号的FPGA中实现了双空间矢量控制数字算法,实验结果表明所提出的双空间矢量控制算法可以独立控制基波和三次谐波电流。在不增加功率变换器容量和电机本体尺寸的前提下,通过三次谐波注入率的优选,可将五相电机的转矩密度提高约20%。

英文摘要：

In order to enhance torque density of five-phase permanent magnetic synchronous motor（PMSM） with third harmonic injection,optimum seeking method for injection ratio of third harmonic was proposed adopting theoretical derivation and finite element analysis method,under the constraint of same amplitude for current and air gap flux.By five-dimension space vector decomposition,the mathematic model in two orthogonal space plane,d1-q1 and d3-q3,was deduced.And the corresponding dual-plane vector control method was accomplished to independently control fundamental and third harmonic in each vector plane.A five-phase PMSM prototype with quasi-trapezoidal flux pattern and its five-phase voltage source inverter were designed.Also,the dual-plane vector control was digitized in a single XC3S1200E FPGA.Simulation and experimental results prove that using the proposed optimum seeking method,the torque density of five-phase PMSM is enhanced by 20%,without any increase of power converter capacity,machine size and iron core saturation.