永磁无刷直流电机调速系统的改进型IMC-PI控制

针对永磁无刷直流电机调速系统提出了一种改进的内模PI(Internal model control PI,IMC-PI)控制方法。根据内模控制原理设计出PI控制器,引入一种作用函数,将其与PI控制器串联构成改进的IMC-PI控制器。作用函数为偏差的微分表达式,其阶次的选择应保证系统开环传递函数严格真实。改进IMC-PI控制可使系统的调节过程分为作用函数趋近零和保持为零的两个阶段,从而保证系统偏差按照作用函数等于零确定的轨迹趋近于零。仿真和实验结果表明方法可有效提高控制系统的性能。

Improved IMC-PI Control for Speed Control System of Permanent Magnet Brushless DC Motor

A novel IMC-PI control method is proposed for speed control system of permanent magnet brushless DC motor. Based on internal model control principle,the PI controller is designed. Then an action function is introduced,and it connects the PI controller in series. The action function is the differential expression of the system error,and its order is chosen to ensure that the open-loop transfer function of the system is strictly proper. The regulating process of the control system includes two stages,which are action function approaching zero and remaining at zero,respectively. So,it can ensure that the system error tends to zero according to the track determined by the action function. The simulation and experiment results show that the method could effectively improve the performance of control system.