Research On Permanent Magnet Synchronous Linear Motor Control System For Electromechanical Actuator

The performance of the missile With remote precision-guided strike capabilityto become an important research topic for our national defense field. The traditionalmissile servo system has normally used pressure actuator or the hydraulic steeringgear servo system, and the development of missile actuator system is limited by itscomplicated structure. The linear electromechanical actuator composed bypermanent magnet synchronous linear motor has the advantages of simple structure,small size, high dynamic response and other characteristics which can enhance themissiles precision-guided. For features of the electric steering gear, this paperreasearch on the the key technologies of thepermanent magnet linear synchronousmotor control system for electric actuators, and improve current predictor-correctorcontrol strategy and the second order sliding mode position control algorithm toachieve high dynamic precisionservo control. The thesis is as follows:First, this paper reviews the development status of the permanent linear magnetsynchronous motor and the application background of the linear electromechanicalactuator, analysis of the characteristics of a variety of linear motor drive controlstrategy. To to improve the current response speed and position control accuracy, itselected to predict the correction control strategies and the sliding mode variablestructure control strategy.Secondly, it analyzes the mathematical model of permanent linear magnetsynchronous motor, and build mathematical model of the moving coil linear motor.According to space vector pulse width modulation principle, it proposes n improvedpulse width modulation algorithm to improve the efficiency of the algorithm.Analyzing the prediction and correction current control algorithm, this paper designstime delay correction of the predictor-corrector control algorithm, and by andresearching on the current forecast error, it proposes the predictor-corrector optimalcurrent control algorithm with the time delay correction to achieve current deadbeatcontrol.Thirdly, this paper bulids the permanent linear magnet synchronous motorcontrol system simulation model where the PI control, the current predictive control,time delay correction of the predictor-corrector control, time delay correction of thepredictor-corrector current optimal control strategy are simulated, and analyzeexperimental results verify the controlcorrectness of the strategy.Forthly, the second order sliding mode position servo control strategy isIn-depth study, and this reasearch discusses the principle of the sliding modevariable structure control, designs of permanent linear magnet synchronous motor sliding mode linear position servo controller. To improve the accuracy of theposition servo system, it propsses consistent asymptotic convergence of theimproved sliding mode position servo algorithm which can ensure that the basis ofthe linear servo system dynamic response and high robustness, make the steady-statethe actual location have been able to converge to the instructionposition, toeliminate the position servo steady-state static error, improve the control accuracy ofthe system to verify the feasibility of the algorithm by simulation.Finally, this paper completes the design and debugging of hardware andsoftware and then builds a DSP-based permanent magnet linear motor testexperimental platform. By the motor parameters test, the motor current response test,the dynamic trajectory tracking and digital positioning servo test, it analyzs theexperimental data and test results, verifies the correctness and feasibility of thelinear servo control system...