Novel Modeling and Research of Direct Torque Control System for Whole-Speed Range

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.