永磁同步电机直接转矩控制系统研究

直接转矩控制理论(DTC)在异步电机上已取得了很大成功。但是永磁电机(PMSM)的直接转矩控制理论在前几年才建立，其中还有许多理论性问题需要澄清。本文详细阐述了零矢量在永磁直接转矩控制系统中的作用，指出如果合理应用零矢量，不仅能使PMSM的DTC系统正常运行，而且能减少转矩脉动的频率，改善系统的性能。

Study for DTC Drive System of Permanent Magnet Synchronous Machine

The direct torque control theory has achieved great success in the control of induction motor. However, in the DTC drive system of Permanent Magnet Synchronous Machine (PMSM) proposed a few years ago, there are many basic theoretical problems that must be clarified. This paper describes an investigation about the effect of the zero voltage space vectors in the DTC system of PMSM and points out that if using the zero voltage space vectors rationally, not only the DTC system can be driven successfully but torque ripple is reduced and performance of the system is improved. Numerical simulations and experimental tests have proved the theory correct.