摘  要：针对传统直接转矩控制异步电动机过程中存在定子磁链和转矩脉动大，谐波含量高的问题，提出一种旨在削弱谐波影响，降低磁链和转矩脉动的十八边形磁链轨迹控制方法，并在Matlab/Simulink中搭建了六边形和十八边形磁链轨迹的DTC仿真模型。通过对同条件下磁链轨迹、电流波形和转矩波形的仿真比较，结果表明了采用十八边形磁链轨迹的DTC方法获得了比较满意的性能。
关键词：直接转矩控制；六边形磁链；十八边形磁链；Matlab/Simulink
Abstract:  To solve the problem of torque and stator flux linkage ripples and strong current harmonic in traditional direct torque control for asynchronous motor,the octadecagon flux linkage trace was adopt,the method of octadecagon flux linkage trace was proved to be effective in reducing harmonic proportion and flux linkage and torque ripples, so modeling hexagon flux linkage and octadecagon flux linkage about DTC system in Matlab/Simulink. Then respectively compared the wave form of stator flux linkage trace and stator current and torque in simulation,the simulation result shows that good performance is obtained with the octadecagon flux linkage in DTC method.
Key words:  direct torque control; hexagon flux linkage; octadecagon flux linkage; Matlab/Simulink