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为了减小大容量电机和小容量电机混合使用时变换器的个数,进一步提高各电机转矩控制性能,提出一种对称六相凸极式永磁同步电机串联三相凸极式永磁同步电机的直接转矩控制策略.利用正交变换矩阵将两台电机的机电能量转换变量投影到空间正交的两个直角平面上,而非机电能量转换变量投影到零序空间中,实现两台电机定子磁链和转矩的解耦.为了实现两台电机的电磁转矩、定子磁链和零序电流直接控制,采用单电压矢量和部分合成电压矢量结合的方法构建最优开关矢量表.实验结果表明,采用该文所提的控制策略后,各台电机定子磁链、电磁转矩相互解耦.“,”In order to reduce the number of converter when large-capacity motor and small motor are used simultaneously and to further improve control performance of each motor's torque,a direct torque control (DTC) strategy was proposed for six-phase symmetrical winding salient pole permanent magnet synchronous motor series-connected three-phase salient pole permanent magnet synchronous motor (PMSM).By using the orthogonal transformation matrix,the electromechanical energy conversion variables of the two motors was projected into the space of two orthogonal planes,and the non electromechanical energy conversion variables was projected into the zero sequence space,to achieve the two motor flux and torque decoupling.The optimal switching table was constructed by combining the single voltage vector and the partial combined voltage vector to control the torque,stator flux linkage and zero-sequence current of two motors at the same time.The experimental results shows that the proposed control strategy makes each motor stator flux linkage and electromagnetic torque decouple each other.