Studies On Control Technology Of Dual Redundancy Brushless DC Motor

This dissertation is based on the project —the research of servo controller for dual redundancy rear earth permanent brushless DC motor (BLDCM).The main focus is to develop the technology about servo control and fault-tolerant for dual redundancy BLDCM used in the aviation realm.Beginning with the dundamental properties of dual redundancy BLDCM, the mathematic model of dual redundancy BLDCM and servo system is established. It studies the rules of current,back electromotive force,speed and torque of dual redundancy BLDCM and simulates the servo system of dual redundancy BLDCM with triple-loops which includes position loop, speed loop and current loop in Matlab. Base on theoretical research, the triple-loops servo control circuit with DSP and CPLD of dual redundancy BLDCM is designed for electric actuation system, then the algorithm routine and strategy of redundancy management are proposed.After classifying different fault-types of servo system, this dissertation analyzes the performance of motor influenced by some main fault and presents the methods for motor fault detection and protection. Then, the concept, selection, configuration and design of redundancy system are introduced and the redundancy management techniques such as fault protection, redundancy switch, and system rebuilt are discussed. At last , a current equalization method for dual-redundancy BLDCM is proposed for the problem of torque distributing disequilibrium by the influence of discrepancies in system parametersFinally, a prototype instrument is developed, the experimental work and the experimental results are accomplished. The achievements of the research have very important reference for continual research.