中文摘要：

从矢量空间解耦的观点出发,建立了含有3次谐波磁场的五相永磁同步电机（permanent magnetic synchronous motor,PMSM）在旋转坐标系下的数学模型,揭示了绕组中各次谐波电流对机电能量转换所产生的不同作用,通过注入一定含量的3次谐波激磁电流,可以在提高电机输出转矩的同时,降低电机定子铁心的磁饱和程度。根据谐波注入前后逆变器功率容量保持不变的原则,通过理论推导和仿真分析,得到了电机输出转矩随3次谐波注入率的变化趋势,为五相PMSM的优化设计和性能分析提供了理论基础。设计了基于转子磁场定向的五相PMSM矢量控制系统,实现了对基波和3次谐波电流的解耦控制。仿真和实验结果验证了方法的正确性和可行性。

英文摘要：

Based on the viewpoint of vector space decoupling, a mathematical model of the five-phase permanent magnet synchronous motor （PMSM） with third harmonic injection is established under the rotating coordinate system. It is clear that different harmonic currents have different effects on electromechanical energy conversion. Calculation results prove that by injecting third harmonic currents, not only the motor output torque is enhanced, but also the magnetic saturation of the stator core is reduced. AccQrding to the principle that power capacity remains unchanged before and after harmonic injection, the changed trend between the motor output torque and the third harmonic injection rate is obtained through theoretical derivation and simulation analysis, which provides the theoretical foundation for optimization design of five-phase PMSM. The vector control system of five-phase PMSM based on the rotor field oriented was designed to realize the decoupling control of fundamental and third harmonic currents. Simulation and experimental results verify the effectiveness and feasibility of the proposed method.