一种永磁偏置磁轴承容错方法的试验研究  

Research on Fault-tolerant Control for Magnetic Bearings Biased by Permanent Magnetic

作　　者：韩辅君[1,2] 房建成[1,2] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100083 [2]北京航空航天大学新型惯性仪表与导航系统技术国防重点学科实验室,北京100083

出　　处：《机械工程学报》2010年第20期34-40,共7页Journal of Mechanical Engineering

摘　　要：磁轴承控制系统的结构复杂,单个磁轴承控制通道的损坏都会导致磁轴承系统整体失效,其可靠性问题成为制约其应用于要求严格场合的瓶颈问题。为提高磁轴承系统的可靠性,提出一种采用电流分配阵的容错控制方法。该方法针对一种采用Homopolar磁极结构的永磁偏置径向磁轴承的磁悬浮飞轮,通过磁路分析和力不变原理,求解一路线圈或相应功放系统故障情况与正常工作情况下的控制电流关系,进而得到故障情况下的电流分配矩阵。该方法具有原理简单、易于工程实现的特点。试验结果表明:该方法能够在磁轴承线圈(功放)损坏的情况下实现磁悬浮飞轮的静态悬浮和升速,实现了磁轴承线圈(功放)系统的容错控制,提高了磁悬浮飞轮磁轴承系统的可靠性。The control system of magnetic bearing has a complex structure.Even the damage of a single control channel will lead to the failure of the whole magnetic bearing system.The reliability requirements limit magnetic bearings from being used in critical applications.To improve the reliability,a fault-tolerant current distribution scheme is presented for a magnetic bearing biased by permanent magnet.In this scheme,the one-dimensional magnetic circuit is used to analyze the force nearby the equilibrium point,and the current distribution matrices are obtained through analyzing the relationship between the normal control-current and the fault control-current.The scheme is effective and easy to implement in engineering.The experimental results indicate that the fault-tolerant scheme can realize static suspension and speed-raising of magnetically suspended flywheel on condition that the coil（power amplifier） is damaged,thus improving the reliability of the magnetic bearing system.

关 键 词：磁轴承 Homopolar 容错控制 可靠性 

分 类 号：TH133.3[机械工程—机械制造及自动化]