| The large-aperture deflection mirror is a precision optical component that can be used to control the direction of beam propagation between the target light source and the receiver.Due to its high pointing accuracy and good steady-state performance,it has been widely used in optical precision tracking and space optical communications in recent years.In order to meet the high-quality imaging requirements of the large-aperture aerial optical system,a high-precision tracking and aiming test method based on the temperature and height of the large-aperture deflection mirror is adopted.It is used to simulate the frame’s coarse and stable servo residuals and test the optical system.Precise and stable performance,which can more realistically evaluate the imaging quality of the optical system.However,the larger diameter of the deflection mirror,the more difficult to design the motor driver.This article mainly focuses on the research of the control method of the large-aperture deflection mirror system,and designs a reasonable control algorithm and high-power voice coil driver for the system,and is verified by simulation experiments.This paper takes the Φ500mm large-diameter deflection mirror system as the research object.In order to improve the dynamic performance and steady-state control accuracy of the deflection mirror system,starting at the theoretical modeling,control method and design of high-power voice coil motor driver.First,the mechanical structure,driver,sensor and electrical module composition of the controlled object system are described and components are selected,and the mathematical models of the research object are established through mechanical dynamics and electrical equations,and consider it as a second-order system.Secondly,the single-axis deflection mirror system and the dual-axis coupling deflection mirror system were identified and the system parameters were corrected through system identification.Thirdly,considering the characteristics of the system,four control strategies are adopted,namely traditional PID control,fuzzy control,state-space control,and decoupling control of the dual-axis coupling system,and the four control strategies are analyzed.Finally,a digital controller and a high-power voice coil motor drive based on the SA60 chip are designed.The operating status of the large-diameter deflection mirror system can be monitored and recorded in real time by the host computer written by Matlab/App Designer.The test results show that compared with other algorithms,the state-space pole placement method has relatively better control effects on large-aperture deflection mirror systems.The overshoot is 9.31%,the peak time is 5.1ms,and the steady-state time is 32.3ms.The experimental results show that the steady-state error is 0.08′,which is about 75% higher than that of fuzzy control and traditional PID control.In the large-aperture deflection mirror system,the steady-state performance index is relatively good. |
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