永磁同步电动机直接转矩控制零矢量的应用研究

Improvement on Null Vector in a Direct Torque Controlled Permanent Magnetic Synchronous Motor

进一步研究了永磁同步电动机直接转矩控制理论,分析了零电压矢量在永磁同步电动机中的作用,构造了一种新型的含零电压矢量控制开关表。对非零电压矢量和含零电压矢量两种控制方式进行了比较研究。仿真和实验结果表明:正确的使用零电压矢量能够有效减少转矩脉动和电流波形畸变,从而改善系统控制性能。

The theory of direct torque control （DTC） in permanent magnetic synchronous motor （PMSM） was improved, and the function of the zero - voltage vector in the permanent magnetic synchronous motor was analyzed. A new sim- ple direct torque controlled switching table in PMSM used zero - vector was presented. The nonzero - voltage and zero - voltage were employed in a direct torque controlled PMSM system respectively. Simulation and experimental results showed that using the null vector rationally can improve the system＇s performance with the low torque ripple and small current distortion.