指数趋近律滑模控制在BLDCM控制系统中的应用研究

Research of Sliding Mode Control Based on Exponential Reaching Law Applied to BLDCM Control System

针对无刷直流电机(BLDCM)经典的直接转矩控制(DTC)磁链观测困难、电流滞环控制开关频率高、开关损耗大等问题,将一种简化的直接转矩控制应用到无刷直流电机控制系统中。为改善控制系统的性能及削弱滑模控制引起的抖阵问题,将一种基于指数趋近律的滑模控制器应用到转速调节器中,并对该控制策略的可行性进行理论分析。通过Matlab/Simulink仿真,表明无刷直流电机的简化直接转矩控制比电流滞环控制转矩脉动更少。基于指数趋近律的滑模控制与基于传统PID控制的无刷直流电机简化直接转矩控制相比,转速响应快,超调少。

To solve the classic problems of brushless DC motor（BLDCM） such as difficul- ty in observing direct torque control （DTC） flux linkage, higher current hysteresis switching fre- quency and larger switching loss, a simplified DTC was applied to control system of BLDCM. In order to improve the performance of control system and weaken the buffeting array caused by sliding mode control, a slid mode controller based on exponential reaching law was applied to the speed regulator and then the feasibility of this control strategy was theoretically analyzed. Through Matlab/Simulink simulation, it is shown that the simplified DTC of BLDCM has less torque ripple than current hysteresis control. The simplified DTC of BLDCM based on exponen- tial reaching law sliding mode control has faster speed response and less overshoot than that based on traditional PID control.