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多相永磁同步电机驱动系统因具有体积小、噪声低、功率密度高等诸多优点，在低压、大功率输出及可靠性要求高的场合已得到了广泛关注和应用。该文以五相永磁同步电机为研究对象，分析并建立传统直接转矩控制(direct torque control，DTC)算法数学模型，在此基础上，以进一步优化转矩纹波及磁链轨迹，降低定子电流低次谐波为控制目标，结合空间矢量脉宽调制(space vector pulse width modulation， SVPWM)技术，提出改进DTC的定频多目标优化控制模型。该算法不仅保持了传统DTC快速的转矩控制动态响应，实现了开关频率恒定及转矩的无稳态误差，同时也兼顾了定子磁链以及相电流的优化控制。仿真和实验结果均表明该算法的正确性和有效性。“,”The multi-phase permanent magnet synchronous machine (PMSM) has the property of small size, low noise and high power density, so it has been widely used in high-power and low-voltage occasion. Based on the analysis of traditional direct torque control (DTC) models and space vector pulse width modulation (SVPWM) technologies, a fixed switching frequency modified DTC algorithm of five-phase PMSM with multi-objective optimization was proposed, which aims at improving the trajectory of stator flux effectively, reducing torque ripples and low harmonic components of stator currents. The proposed algorithm brings the following benefits: such as fast torque control dynamic response, the fixed switching frequency, the optimization control of torque, stator flux and stator phase currents. Simulation and experimental results show the feasibility and effectiveness of the proposed algorithm.