Research On Direct Torque Control System Of Brush-less DC Motor Based On ADRC

Start with the control strategy of brush-less DC motor,and for the purpose of improving motor performance,this paper has carried out discussion,analysis and research from many aspects.This article consists of the following aspects: First,BLDCM working principle and mathematical model;Second,multi-faceted research and analysis of direct torque control methods for brush-less DC motors;Third,explore brush-less motor direct torque control(BLDCM DTC)stator flux linkage;Fourth,replace the ADRC with PI control and introduce a new control solution.The details are as follows:First,briefly introduce the basic characteristics and development trends of BLDCM,expound the characteristics and development of BLDCM DTC strategy,and carefully introduce and compare the main advanced control algorithms of motors.Second,analyze the basic principles of BLDCM and then give a mathematical model of the ideal motor.Then,further analyze the most prominent pulsation problems of BLDCM,sum up the current main solutions.Finally,analyze and compare several common control systems.Third,make an introduced of the BLDCM DTC control strategy.First of all,it analyzes the basic characteristics of BLDCM DTC,expounds some speciality and related difficulties,and then analyzes the main components of BLDCM DTC system.Conduct the modeling and simulation of the system,the experimental results show that the BLDCM DTC system can achieve considerable dynamic and static performance,but still needs some improvement.Fourth,a new type of stator flux linkage is proposed for BLDCM DTC.The idea of a new type of stator flux linkage is proposed and the completion process of the scheme is introduced in detail.Then,establish models to make simulation as well as conduct comparison and analysis.This new method is superior to traditional methods in suppressing torque ripple and dynamic response performance.Under the new flux linkage,the vector trajectory of the armature flux linkage can objectively reflect the motor load variation and torque ripple,and more convenient to analyze the experimental results of the control system.Fifth,replace the traditional PI control with ADRC,and apply to the control module in the BLDCM DTC.The ADRC algorithm is analyzed and the ADRC theory is applied to the brush-less DC motor control system.The results of modeling and simulation analysis show that the scheme proposed in this chapter that based on ADRC is superior to traditional PI control in terms of overall dynamic and static performance of control.