approximate circle meaning in Chinese

近似圆

In this dissertation , the author has accomplished the simulation of the dtc system and analyzed the corresponding results . the software of the digital control system , in which the digital signal processor ( dsp ) is used , has also been designed in the thesis . the direct torque control scheme is studied in the paper , and the simulation models of hexagon flux control system and approximate circle flux control system are presented based on the application of matlab / simulink
本文对异步电机直接转矩控制变频调速方法进行了研究，采用mathworks软件公司为matlab开发的系统模型图形输入和仿真工具simulink对直接转矩控制的六边形和近似圆形两种定子磁链控制方法进行了仿真，实现了有速度传感器的直接转矩控制系统的构建，从理论上证明了这两种方法的可行性。