摘  要：在以往的永磁同步电机直接转矩控制研究中，将零电压矢量引入到转矩调节器中，认为其起到保持当前转矩的作用。该文对永磁同步电机中零电压矢量对转矩脉动和磁链脉动的影响进行了详细的理论分析，指出在电机高速运行的情况下，零矢量实际是起到减小转矩的作用。转速越高，零矢量减小转矩的效果越明显。仿真结果证明了理论分析的正确性，这为正确理解零矢量在永磁同步电机直接转矩控制的作用以及今后对零矢量作用的范围进行优化设计具有指导意义。
关键词：永磁同步电机；直接转矩控制；零矢量；转矩脉动

Abstract: In previous study of permanent magnet synchronous motor direct torque control(PMSM DTC), considered to keep the torque stable,zero voltage vector was introduced into the torque controller. The influence of zero voltage vector on flux and torque ripple in PMSM DTC was analyzed detailedly in this paper.And it pointed out that,when the motor run with a high speed,zero voltage vector actually reduced the torque.The higher the rotor speed was,the more obvious the effect of reducing the torque was. The simulation result verified the validity of the theory analysis.It is a significant guide for understanding correctly the function of zero voltage vector in PMSM DTC and optimizing the design of zero voltage vector working zone in the future.
Key words: permanent magnet synchronous motor; direct torque control; zero voltage vector; torque ripple