弱耦合径向磁力轴承冗余设计研究

发布时间：2018-04-10 19:48

本文选题：弱耦合 + 冗余设计　；参考：《武汉理工大学》2014年硕士论文

【摘要】：磁力轴承由于没有机械磨损，，工作寿命理论上可以很长，具有比较高的可靠性。但是把磁力轴承应用于航空发动机等对可靠性要求较高的高科技设备时，其可靠性仍然无法得到满足。因此如何进一步提高磁力轴承的可靠性成为国内外研究的热点。磁力轴承冗余设计是提高其可靠性的一种有效手段，本文针对径向磁力轴承进行了冗余设计研究。首先提出了一种弱耦合径向磁力轴承冗余设计方案，结合弱耦合径向磁力轴承的特点定义了两类失效形式，并对此提出了基于力平衡补偿思想的失效补偿策略。然后以6磁极对弱耦合径向磁力轴承为例，研究了转子处于平衡位置和最大位移时两类失效形式的力平衡补偿。研究表明，在弱耦合径向磁力轴承具有一定的线圈电流裕量和磁极铁芯饱和裕量的前提下，发生两类失效时，可以通过力平衡补偿的方法对失效磁极对进行完全补偿。本文推导了推力盘处于轴向平衡位置时因多环轴向磁力轴承不平衡失效引起的附加力矩表达式，分析了多环轴向附加力矩对弱耦合径向磁力轴承产生的影响。结合磁力轴承冗余设计要求，设计了一套完整的磁悬浮冗余装置，并对径向磁力轴承、轴向磁力轴承、位移传感器的冗余设计形式进行了说明，重点阐述了弱耦合径向磁力轴承冗余设计的关键点。为了更好地验证基于力平衡补偿思想的弱耦合径向磁力轴承冗余重构控制策略的可行性，将6磁极对弱耦合径向磁力轴承简化为单个磁极对形式，并在该实验装置上研究了磁力轴承线圈失效的起浮特性、失效补偿后的起浮特性和失效重构过渡过程的动态特性。实验表明：任一线圈失效，采用力平衡补偿的方法，都能使衔铁稳定悬浮，并能使系统从正常工作状态顺利过渡到故障工作状态，且保持良好的稳态悬浮特性。
[Abstract]:The working life of magnetic bearing can be very long theoretically and has high reliability because of no mechanical wear.Therefore, how to further improve the reliability of magnetic bearings has become a hot spot at home and abroad.Redundant design of magnetic bearings is an effective means to improve its reliability.Firstly, a redundant design scheme of weakly coupled radial magnetic bearings is proposed. Two kinds of failure forms are defined according to the characteristics of weakly coupled radial magnetic bearings, and a failure compensation strategy based on the idea of force balance compensation is proposed.Then, taking the six pole pair weakly coupled radial magnetic bearing as an example, the force balance compensation of two kinds of failure modes when the rotor is at the equilibrium position and the maximum displacement is studied.It is shown that under the condition that the weakly coupled radial magnetic bearing has a certain current margin of coil and saturation margin of the core of the magnetic pole, two kinds of failure can be completely compensated by the method of force balance compensation.In this paper, the expression of additional torque caused by unbalanced failure of multi-ring axial magnetic bearings when the thrust disk is in the axial equilibrium position is derived, and the influence of the multi-ring axial additional torque on weakly coupled radial magnetic bearings is analyzed.According to the design requirements of magnetic bearing redundancy, a complete set of magnetic suspension redundancy device is designed, and the redundant design forms of radial magnetic bearing, axial magnetic bearing and displacement sensor are explained.The key points of redundant design of weakly coupled radial magnetic bearings are expounded.In order to better verify the feasibility of redundant reconfiguration control strategy for weakly coupled radial magnetic bearings based on the idea of force balance compensation, the six pole pair weakly coupled radial magnetic bearings are simplified into a single pole pair form.The floating characteristics of the magnetic bearing coils after failure compensation and the dynamic characteristics of the transition process of the failure reconstruction are studied on the experimental device.The experimental results show that the method of force balance compensation can make the armature suspended stably and make the system transition smoothly from the normal working state to the malfunction working state, and maintain the good steady state suspension characteristic by using the method of force balance compensation for any coil failure.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TH133.3

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