Development Of Brushless DC Motor Drive Controller For Space Operation

With the development of China’s aerospace industry,there are higher performance requirements for motion control systems.In space applications,facing complex external environment and control task requirements,short communication cycles,high power density,and high security are required for motion control systems.Based on the characteristics of the drive controller for space applications,this paper has designed a "miniaturized","hard real-time","high reliability" brushless DC motor drive controller.With the actual engineering application as the background,and the high power density brushless motor drive controller for space applications as the goal for study,this paper designs the overall scheme of the drive controller.It has important practical reference value for the scheme design realization of drive controller with features of distributed real-time communication,miniaturized compact joints,and high-precision motion control.As for the hardware circuit and structure,a design scheme of three-layer hollow shaft hardware architecture with communication board,control board and driver board has been established.The ET1100 communication chip and F28379 D control chip were used to design the driver control circuit and build a hardware platform.Ga N power devices were deployed to improve energy utilization efficiency.The hardware structure scheme effectively reduces the mechanical size of the driver,ensures miniaturization,and increases the power density per unit volume.Based on the hardware platform,the software system was designed according to the control tasks.Distributed communication based on EtherCAT industrial real-time Ethernet helped achieve real-time,high-speed and high-efficiency data transmission.Besides,motor control methods were analyzed and discussed,which found that using vector control algorithms,compared with SPWM control,could improve the utilization rate of DC side voltage.In addition,a three-loop control flow chart was performed,the system was mathematically modeled and analyzed,and PID control parameters were determined.After that,the motion position trajectory and acceleration / deceleration algorithms were mathematically derived,providing theoretical support for subsequent programming implementation.The system simulation was performed by Matlab/Simulink to validate the correctness of the theory;an experimental platform was built on the prototype to verify the functional modules of the entire system one by one,which achieved the expected results and laid the foundation for subsequent research.