| As the actuator of the rocket control system,the steering gear is an important part of the system.During the flight,the rudder controller receives the rudder deflection angle signal from the flight control computer on board the missile,and controls the deflection of the rudder surface of the rocket to adjust the flight attitude.Its performance directly determines the dynamic quality of the rocket during its flight.With the development of various precision guided weapons,people have put forward higher requirements for the overall performance of the steering gear.However,due to the advantages of small size and high precision,the electric steering gear has been studied in depth by researchers,and it has been widely used.This article focuses on the research and design of the electric steering gear control system.Through the use of high-performance digital chips,intelligent drive chips,communication chips,power modules,brushless DC motors and other devices,the highly reliable electric steering gear controller is studied and designed.The main research content and work results of the thesis are as follows:This paper first studies the principle and mathematical model of the electric steering gear,designs the scheme and selects the device according to the performance index of the electric steering gear control system,and then analyzes the structure and working principle of the brushless DC motor.By analyzing the various parameters of the electric steering gear,this paper designs a set of highly reliable electric steering gear controller,which can drive three brushless DC motors at the same time.The controller is composed of a control board,a drive board and a power board,including a power filter circuit,a power conversion circuit,a DSP+CPLD control circuit,a motor drive circuit,a serial communication circuit,and a signal acquisition circuit.This text also carries on the software design of the electric steering gear control system,the software design includes DSP program and CPLD program.Among them,the DSP chip is used as the main controller,which mainly realizes the two-way communication between the flight control host computer and the electric steering gear controller,the collection of motor speed and position information,and the generation of bipolar PWM.As a co-processor,CPLD mainly realizes the conversion of Hall signal to obtain the speed signal of the motor.By inputting PWM and the calculation of Hall signal,the input signal of the motor drive module is obtained to control the speed and direction of rotation.Based on the mathematical model of the brushless DC motor,in the Matlab/Simulink environment,this article uses the resources in the module library and writes S-functions to build various functional modules,and compose them into a control system simulation model.In order to verify the advantages and disadvantages of traditional PI control and fuzzy adaptive PI control algorithms,this paper uses PI control and fuzzy adaptive PI control algorithms for the simulation verification of the position loop of the control system simulation model.The simulation experiment shows that the brushless DC motor speed control system uses fuzzy adaptive PI control to achieve a more significant control effect,and the system has better dynamic performance and faster response speed.Finally,an experimental platform was built to verify the designed hardware and software.By analyzing the experimental results,it can be obtained that the system has excellent performance such as reliability,stability and rapidity.The test results and experimental data show that the designed combined electric steering gear controller meets the performance index requirements. |
