本文選題：弱耦合 + 冗余設(shè)計(jì)��； 參考：《武漢理工大學(xué)》2014年碩士論文

【摘要】：磁力軸承由于沒(méi)有機(jī)械磨損，，工作壽命理論上可以很長(zhǎng)，具有比較高的可靠性。但是把磁力軸承應(yīng)用于航空發(fā)動(dòng)機(jī)等對(duì)可靠性要求較高的高科技設(shè)備時(shí)，其可靠性仍然無(wú)法得到滿足。因此如何進(jìn)一步提高磁力軸承的可靠性成為國(guó)內(nèi)外研究的熱點(diǎn)。 磁力軸承冗余設(shè)計(jì)是提高其可靠性的一種有效手段，本文針對(duì)徑向磁力軸承進(jìn)行了冗余設(shè)計(jì)研究。首先提出了一種弱耦合徑向磁力軸承冗余設(shè)計(jì)方案，結(jié)合弱耦合徑向磁力軸承的特點(diǎn)定義了兩類失效形式，并對(duì)此提出了基于力平衡補(bǔ)償思想的失效補(bǔ)償策略。然后以6磁極對(duì)弱耦合徑向磁力軸承為例，研究了轉(zhuǎn)子處于平衡位置和最大位移時(shí)兩類失效形式的力平衡補(bǔ)償。研究表明，在弱耦合徑向磁力軸承具有一定的線圈電流裕量和磁極鐵芯飽和裕量的前提下，發(fā)生兩類失效時(shí)，可以通過(guò)力平衡補(bǔ)償?shù)姆椒▽?duì)失效磁極對(duì)進(jìn)行完全補(bǔ)償。 本文推導(dǎo)了推力盤處于軸向平衡位置時(shí)因多環(huán)軸向磁力軸承不平衡失效引起的附加力矩表達(dá)式，分析了多環(huán)軸向附加力矩對(duì)弱耦合徑向磁力軸承產(chǎn)生的影響。 結(jié)合磁力軸承冗余設(shè)計(jì)要求，設(shè)計(jì)了一套完整的磁懸浮冗余裝置，并對(duì)徑向磁力軸承、軸向磁力軸承、位移傳感器的冗余設(shè)計(jì)形式進(jìn)行了說(shuō)明，重點(diǎn)闡述了弱耦合徑向磁力軸承冗余設(shè)計(jì)的關(guān)鍵點(diǎn)。 為了更好地驗(yàn)證基于力平衡補(bǔ)償思想的弱耦合徑向磁力軸承冗余重構(gòu)控制策略的可行性，將6磁極對(duì)弱耦合徑向磁力軸承簡(jiǎn)化為單個(gè)磁極對(duì)形式，并在該實(shí)驗(yàn)裝置上研究了磁力軸承線圈失效的起浮特性、失效補(bǔ)償后的起浮特性和失效重構(gòu)過(guò)渡過(guò)程的動(dòng)態(tài)特性。實(shí)驗(yàn)表明：任一線圈失效，采用力平衡補(bǔ)償?shù)姆椒�，都能使銜鐵穩(wěn)定懸浮，并能使系統(tǒng)從正常工作狀態(tài)順利過(guò)渡到故障工作狀態(tài)，且保持良好的穩(wěn)態(tài)懸浮特性。
[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.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH133.3

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