Research On Real-time Compensation And Control Technology Of High-precision Bias Current Regulating Mechanism

The adjustable bias current servo control system is an important Aerospace load,which is used to compensate the bias angle generated by the aerospace camera in remote sensing imaging,so as to eliminate the image movement and improve the imaging quality.In the background of the subject studied in this paper,the imaging mode of space camera is different from the traditional push scan imaging.The corresponding requirements are that the bias current adjustable servo control system has important indexes such as high-precision speed regulation,high speed stability and high real-time.In order to improve the image quality of space camera under rotating imaging condition,this paper develops a high-precision servo control system,and studies the vector control strategy and control algorithm,the design of servo controller algorithm and the realization of system software and hardware.Firstly,this paper establishes the mathematical model of the permanent magnet synchronous motor used in the subject,and makes some idealized assumptions.On this basis,the principle of vector control strategy is studied.It mainly includes coordinate transformation and pulse width modulation,mainly including coordinate transformation and pulse width modulation.The frequency characteristics of the established permanent magnet synchronous motor transfer function model are analyzed,the cut-off frequency of double loop control is determined,and the controller coefficient is further obtained.The simulation is completed on the MATLAB / Simulink software platform to verify the correctness of the vector control strategy.Secondly,the fuzzy control algorithm is introduced to make up for the existing problems of PI controller,and the step and curve tracking simulation experiments of the servo system are completed.Then,in order to improve the control performance,the idea of variable universe is introduced.The innovation of this paper is to optimize and expand the expansion factor that plays an important role in the variable universe,and get the polynomial form of the function expansion factor.Finally,the correctness and the advanced nature of the modified expansion factor are verified theoretically based on the matlab/Simulink platform.Finally,this paper designs the software and hardware of the control system,introduces the main control unit,driving unit and important components of the power supply system in the hardware scheme,and also expounds the software development process and algorithm data flow.Finally,the prototype of the control scheme and the improved variable universe control algorithm is tested,including step response and bias flow tracing experiments.The experimental results are analyzed to verify the advanced and feasibility of the improved algorithm.