Scanning Galvanometer Control System Design And Implementation

A scanning galvanometer,also called galvanometer or scanning motor,is a typical optical servo tracking system,which has been widely used in many fields ranging from national defense,aerospace and industry.The scanning galvanometer system is mainly composed of four parts from the function structure aspect,which are scanning motor,servo drive circuit,angle position sensor and scanning mirror.Based on a specific research and development task of a scanning galvanometer motor system,this thesis focuses on the design and implementation of the whole control system.The main purpose is to develop a high-speed,stable and high-precision scanning galvanometer,which can operate stably,quickly and accurately in complex environment according to control instructions and can be used in aerospace system.Firstly,the basic principle and structure of the scanning galvanometer system are analyzed in detail.According to the task requirements,the technical indicators of the scanning galvanometer system are given,the input conditions of the system’s design are defined,and the physical structure of the galvanometer motor is further designed.Secondly,the whole scanning galvanometer system and its four parts,including the galvanometer motor body,position sensor and system correction controller,are modeled and simulated in this thesis.The decoding algorithm and correction network of the position sensor are designed to ensure that the position sensor can realize the closed-loop function of the system.By using the frequency domain design method,this thesis designs controllers for the current inner loop,the velocity loop and position outer loop,and the controllers are also simulated and analyzed.Thirdly,a detailed hardware design is proposed in this thesis,which is including the key components selection and hardware design for each subsystem such as the controller,position decoding circuit,the power driver,the power supply circuit and so on.The related software flow structure is also further given.Finally,the whole galvanometer motor control system is realized,and the debugging key links,error analysis results and debugging results are given.The actual performance shows that the design scheme is reasonable,the control algorithm is effective,the actual system meets the design requirements,and the development of the scanning galvanometer control system is successfully completed.