摘要：为了提高运载工具姿态控制伺服机构的可靠性，提出一种三余度的机电伺服机构，在三余度机电伺服机构基本方案的基础上，开展了故障模式分析和仿真，进行三余度机电伺服机构故障辨识和故障隔离研究，得到了故障重构的设计思路，并对三余度机电伺服机构进行验证试验研究。

关键词：三余度；机电伺服机构；故障隔离；故障重构
Abstract: In order to improve the reliability of shuttle attitude control servo mechanism，This paper presented a treble-redundancy of mechanical and electrical servo mechanism. On the basis of analyzing the treble-redundancy of mechanical and electrical servo mechanism, carry out the fault mode analysis and simulation and researches the technology of treble-redundancy of mechanical and electrical servo fault identification and fault isolation. The fault reconstruction design train of thought was got. The experiment study show that the system is feasible.

Key words: treble-redundancy; mechanical and electrical servo mechanism; fault isolation; fault reconstitution