永磁同步电机定子磁链十二区间直接转矩控制

A DTC Scheme of Twelve-Section Stator Flux Linkage for PMSM

传统的直接转矩控制以其简单的结构和对转矩的直接控制为人们所知,然而,它仍存在一些不足,如转矩脉动比较大,并且低速范围运行时,速度响应不够平滑。在传统六区间圆形定子磁链(6个点压工作矢量)直接转矩控制基础之上,本文提出了十二分区控制方案(12个电压控制矢量),并制定了相应的开关原则。用Matlab/Simulink对永磁同步电机速度控制系统进行仿真对比实验。结果显示,十二分区方案在动态性能方面,特别是在低速区,要明显优于六分区方案。

The traditional direct torque control （DTC） has its well-known advantages of simple construction and directly controlling motor torque, however it still has some disadvantages of high torque ripple and no smooth speed response in the low speed range. On the basis of the traditional DTC six-section control scheme of stator circular flux linkage （six working voltage vectors）, this paper presents a twelve-section control scheme （twelve working voltage vectors）, and establishes its corresponding switching principle. Simulation comparison experiments for the two schemes are performed under a PMSM speed control system by using the Matlab/Simulink. The result shows that the dynamic performance of twelve-section control scheme is superior to that of six-section control scheme, especially in the low speed range.