Compound Anti Disturbance Control Of Permanent Magnet Synchronous Motor

With the rapid development of modern power electronics technology,AC servo speed control and modern control theory,it is a general trend for the exchange speed control replacing DC speed control system.Permanent Magnet Synchronous Motor(PMSM),which is widely used in AC speed control system,has the advantages of simple structure,small torque ripple,small inertia,wide speed range,good dynamic performance and high control precision.However,the permanent magnet synchronous motor control system is a strong coupling,multivariable and non-linear complex system,coupled with the disturbance caused by external environment,so the control strategy will directly affect the merits of the motor control performance,therefore,domestic and foreign scholars are paying more and more attention to the algorithm research of permanent magnet synchronous motor control.Based on this,this paper studies the motor speed regulation method,the specific content is as follows:The paper introduces the research status of control strategy of permanent magnet synchronous motor speed control system,and briefly analyzes several commonly control algorithms used in motor speed control at home and abroad.Then,based on the analysis of the mathematical model of permanent magnet synchronous motor,the paper studies the vector control scheme of permanent magnet synchronous motor.After introducing the basic principle and design method of disturbance observer and inertia identification,a combined anti-disturbance strategy based on PI controller is designed.Considering the features of permanent magnet synchronous motor speed control system,including nonlinear,strong coupling and multi-interference,the output variables of the system are analyzed by Lie differential operation,which based on the theory of direct feedback linearization,then,the nonlinear system state feedback equation and the coordinate transformation equation can be calculated to decoupling the system and the linearization of motor input and output,whose tracking performance is superior to the traditional PID control.The influence caused by load disturbance and inertia will be reduced by applying disturbance observation and inertia identification to the system.Aiming at solving the problem of the nonlinear system of permanent magnet synchronous motor and easily tracking the given position signal,this paper combines the backstepping control method in the permanent magnet synchronous motor position servo system.The method is based on the stability of Lyapunov,which ensures the stability of the system.At the same time,the method is easily applied to engineering because of its less design parameters.Furthermore,considering the changes of parameters of permanent magnet synchronous motor in the actual running,the paper proposes a control method combined backstepping control with adaptive method,which can effectively restrain the influence of the parameters on the servo tracking performance of the system.This paper proves that the parameters as the inertia can not be adaptively applied,so the inertia identification is used to identify the inertia of the permanent magnet synchronous motor,which can reduce the influence of the changing inertia on the performance of system,make the velocity response achieve a dynamic effect and possess better robustness and stronger anti disturbance ability.