Design And Implementation Of Life Testing And Control Instrument For Space Rotating Mechanism

The space rotation mechanism is a key component of optical remote sensing equipment.Various rotating mechanisms are driven by stepper motors and DC brushless motors.Whether the space turning mechanism has long life and precision operation affects the reliability and life of the entire system.Therefore,it needs to be verified by the strict space experimental rotating specifications.Now,equipment is temporarily built by discrete components,and there is urgent to customize the instrument.The instrument needs to complete data collection and storage,temperature difference control of variable temperature,periodic stability test,and standard deviation statistics.Based on the principles of electronic measurement and thermal control,this paper analyzes the existing demand.The electronic hardware design uses sensing and preprocessing to obtain signals,and the data by A/D is communicated to the field programmable device(Cyclone IV series FPGA).Through the schematic and Verilog HDL mixed design,FPGA measure the speed cycle stability,control the temperature difference between the front and back of the mechanism,and communicate to the microcomputer by asynchronous serial communication.This article uses VC++ to write the monitoring software.It is designed to complete the timing communication,the display of rotating speed,temperature,driving voltage and current,the probabilistic(variance and standard deviation)statistical function of the speed stability,and give a reliability evaluation,storing data by time or file size and the alarm function of abnormal data.Through the functional modules,the software can monitor and control the long-life test of the space rotating mechanism,which can achieve the purpose of decomposing and inspecting the test parts,to infer the reliability of the on-orbit work,and to determine the reliability margin.Finally,through the debugging and analysis of the instrument,it is proved that the FPGA-based hardware acquisition and processing circuit and the host software developed by VC++ can cooperate with each other to complete the prototype development of the test equipment of the space rotation mechanism.And each function and performance meet the design requirements.