开绕组永磁同步电机直接转矩控制研究

传统结构永磁同步电机直接转矩控制中存在磁链控制不对称和转矩脉动较大的问题,提出了一种开绕组永磁电机结合双变换器拓扑结构实现直接转矩控制的优化方法,利用系统中双变换器拓扑多空间矢量输出的优点,分析开绕组永磁同步电机等效三电平条件下的不同扇区划分方法及对应空间电压矢量组合的方案,优化开关表的选择,实现减小合成磁链的不对称性,并降低输出转矩脉动。最后,通过仿真和实验验证了提出的开绕组永磁同步电机直接转矩控制方法的有效性。

Research on Direct Torque Control of Open Winding Permanent Magnet Synchronous Motor

In order to solve the flux asymmetry and torque ripple problem existed in the direct torque control of traditional structure for permanent magnet synchronous motor,an optimization method for direct torque control for open winding permanent magnet motor combined with dual converter topology was proposed,the advantages of multi-space vector output with dual-converter topology in the system were noticed,the method with different sectors division and the corresponding space voltage vector combination were analyzed under the condition with equivalent three level of open winding PMSM,selection of switch list was optimized,the reduction for the asymmetry for synthesis flux and the output torque ripples was achieved. Finally,the validity of the proposed DTC method was verified by simulation and experimental results.