Reliability Design Of High Power Permanent Magnet Synchronous Motor Control System

With the rapid development of new energy industry,all kinds of new energy products are dizzying.In order to reduce the environmental pollution of aircraft,new energy electric aircraft came into being.China’s new energy electric aircraft industry is still in its infancy,the aircraft used by the permanent magnet synchronous motor control system is necessary.Permanent magnet synchronous motor control system has been widely used in the field of electric vehicles,but its highly integrated,complex structure and other characteristics of the system reliability has been difficult to improve.As a key component of aircraft,the reliability of electric control system for aircraft is directly related to personal and property safety.Therefore,it is of great theoretical and practical value to study and design the reliability of permanent magnet synchronous motor control system for electric aircraft.Thesis mainly focuses on the reliability design of 50 KW permanent magnet synchronous motor control system for aircraft.Permanent magnet synchronous motor control system can achieve the motor acceleration,deceleration and commutation and other operations,and can achieve the bus current and voltage,three-phase current and voltage signal acquisition,diagnosis,alarm and other functions.It consists of signal acquisition module,drive and control module,communication module and power module.Firstly,the fault data of each component of the PMSM control system is studied.Based on the statistical data of system failures,the overall hardware structure of the control system is designed for reliability.Based on the GO method,a quantitative analysis of the specific reliability indicators of the entire system is made.After reaching the index requirements,the reliability design of each module of the control system and the reliability design of the printed circuit board are designed,including isolation design of digital signal and analog signal,over-current and over-voltage protection design,and important circuit and component protection design.After the hardware system is completed,the reliability of the system software architecture is further optimized,and then the permanent magnet synchronous motor control system program with high reliability is written.Finally,set up 50 KW permanent magnet synchronous motor control system test platform.All design functions of the motor control system were tested.The test results show that the output torque of the motor is stable,and all the components of the system can work normally to meet the design specifications.