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中文摘要：
在分析传统直接转矩控制系统中导致转矩脉动的因素和分析定子电流中存在着非零的去磁或增磁分量id的基础上，对永磁同步电动机直接转矩控制系统进行了改进，用对定子电流励磁分量实施改进调节代替对定子磁链的两点式控制，改进后消除了定子电流中不希望的分量，提高了交流传动系统的效率。新系统控制结构简单，便于实现。仿真结果表明系统的动静态性能得到了改善，降低了转矩脉动，同时保留了优良的控制性能，而且系统效率更高。
英文摘要：
Based on analysing the factors that cause torque ripple and the nonzero demagnetism/inmagnetism component in stator current for the typical direct torque control system of the permanent magnet syn- chronous motor, a novel control system which directly controls the magnetizing component of the stator cur- rent with two-level bang-bang controller was presented. The improvement eliminated the component which in the stator current did not hope, enhanced the exchange transmission system efficiency. It is simple and easy to implement. The simulation results indicate the static and dynamic performance of the new system is improved and torque ripple is decreased, simultaneously still retains the better control performance and higher efficiency than the typical direct torque control system.
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