中文摘要：

提出了一种适合于全速范围的直接转矩控制系统仿真模型。针对PI参数对系统的影响，改进了PI速度调节器的设计，改善了系统的磁链和转矩控制性能。同时给出了基于MATLAB/SIMULINK的系统仿真模型，仿真结果表明了该方法的正确性，能实现六边形磁链轨迹和近似圆形磁链轨迹的平滑切换。

英文摘要：

This paper proposes a simulation model of direct torque control system for whole-speed range. The design of PI speed regulator is changed to improve the properties of the flux and torque of the system due to the effect of PI parameters to the system. Also the simulation model based on MATLAB/SIMULINK is given and demonstrate that this model is true and can realize the smooth translation between the flux track of hexagon and approximate circle.