基于空间矢量调制的永磁同步电机无磁链环直接转矩控制方法研究

Research on Direct Torque Control Method Based Space Vector Modulation of Permanent Magnet Synchronous Motor without Flux Linkage Loop

针对传统无磁链环直接转矩控制精度不高、实现复杂的问题,依据永磁同步电机电磁转矩的形成原理,借助MATLAB/Simulink仿真工具,研究了一种基于空间矢量调制的永磁同步电机无磁链环直接转矩控制方法。该方法根据转矩误差和定子磁链限幅需要直接得到参考空间电压矢量,实现转矩轨迹精确跟踪给定,结构简单。仿真结果表明,引入空间矢量调制后电机定子磁链自适应变化效果更好,具有更高的功率因数,并有效降低了转矩脉动。

The control precision of torque is not high and the realization method is complex when using traditional direct torque control method without flux linkage loop on permanent synchronous motor. A direct torque control method based space vector modulation（SVM） of permanent synchronous motors without flux linkage loop was presented with the help of MATLAB/Simulink. The reference voltage space-vector was determined according to the error of torque combined with the amplitude limiting requirement of stator flux linkage. The stator flux linkage could track the specified value accurately. The structure of new control method was simple. The simulation verified that the introducing of space vector modulation could reduce the torque ripple effectively and retain the excellent dynamic performance. Besides, the effect of stator flux adaptive change was better and the power factor of motor was higher.