開關(guān)磁阻電機(jī)性能的場—路—運(yùn)動耦合分析.pdf

1、摘要摘要開關(guān)磁阻電機(jī)由于結(jié)構(gòu)簡單、系統(tǒng)可靠性高、對運(yùn)行環(huán)境適用能力強(qiáng)等特點(diǎn)，在很多領(lǐng)域有著廣泛的應(yīng)用，也成為國家863電動汽車項(xiàng)目汽車驅(qū)動系統(tǒng)的備選電機(jī)之一。本文針對開關(guān)磁阻電機(jī)研究中的熱點(diǎn)和難點(diǎn)問題進(jìn)行了深入的研究和探討。開關(guān)磁阻電機(jī)穩(wěn)態(tài)及動態(tài)運(yùn)行性能的分析研究。開關(guān)磁阻電機(jī)雖然結(jié)構(gòu)簡單，但由于雙凸極的結(jié)構(gòu)特點(diǎn)及控制電路的開關(guān)性，電磁關(guān)系十分復(fù)雜，是一種具有局部高飽和、相間禍合較強(qiáng)的復(fù)雜非線性系統(tǒng)，采用常規(guī)方法難以準(zhǔn)確分析其性能.本文

2、首先針對電機(jī)三維磁場分析中的難點(diǎn)問題—三維磁鏈的計(jì)算，提出了結(jié)合網(wǎng)格重構(gòu)思想的計(jì)算三維磁鏈的方法，計(jì)算了反映端部磁場隨轉(zhuǎn)子位置角及相電流變化的開關(guān)磁阻電機(jī)繞組端部電感曲線族。建立了電機(jī)磁場方程與主控制電路方程直接禍合的二維場一路一運(yùn)動藕合有限元模型，分析了不同轉(zhuǎn)速、不同控制方式下電機(jī)的穩(wěn)態(tài)運(yùn)行性能，模擬了電機(jī)某一繞組斷路的故障運(yùn)行狀態(tài)。將端部電感引入二維有限元模型，分析了不同結(jié)構(gòu)及繞組連接方式的開關(guān)磁阻電機(jī)端部磁場效應(yīng)的影響。結(jié)合磁場分

3、析，本文提出了根據(jù)磁場分布劃分鐵心區(qū)域計(jì)算電機(jī)鐵心損耗的方法，計(jì)算并測量了不同轉(zhuǎn)速下電機(jī)穩(wěn)態(tài)運(yùn)行時(shí)的鐵心損耗。對于電磁系統(tǒng)和機(jī)械系統(tǒng)藕合的電機(jī)動態(tài)性能分析問題，本文建立了電磁方程與機(jī)械方程間接禍合的時(shí)步有限元模型，分析了開關(guān)磁阻電機(jī)的起動特性。電磁力有限元分析方法的研究與應(yīng)用。深入研究了三種電磁力的計(jì)算方法，即麥克斯韋應(yīng)力法、虛位移法和節(jié)點(diǎn)力法，通過理論推導(dǎo)和數(shù)值計(jì)算給出了二維電磁力有限元分析中麥克斯韋應(yīng)力法積分路徑的選取方法，利用節(jié)點(diǎn)

4、力法能夠進(jìn)行局部力分析的特點(diǎn)，通過數(shù)值計(jì)算分析了開關(guān)磁阻電機(jī)轉(zhuǎn)子轉(zhuǎn)動過程中定子磁極與轉(zhuǎn)子磁極之間作用力的變化，同時(shí)，對節(jié)點(diǎn)力法做了進(jìn)一步的簡化，減小了剛性物體全局力分析的計(jì)算量?？刂茀?shù)對開關(guān)磁阻電機(jī)振動影響的研究.開關(guān)磁阻電機(jī)的振動和噪聲問題較為突出，對引起振動的兩大主要因素—轉(zhuǎn)矩脈動和徑向磁拉力的定量分析和研究將為開關(guān)磁阻電機(jī)振動抑制的研究提供理論基礎(chǔ)和研究平臺。本文通過數(shù)值計(jì)算定量分析了開關(guān)磁阻電機(jī)運(yùn)行在同一穩(wěn)態(tài)工作點(diǎn)的不同開通、

5、關(guān)斷角下的轉(zhuǎn)AbstractFieldCircuitMotionCoupledAnalysisforSwitchedReluctanceMotorAbstractSwitchedreluctancemotor(SRM)hasbeenusedinmanyfieldsinviewofitsapplicabilityinhardoperatingenvironmentshighreliabilityandsimplestructure.The

6、reforeSRMhasbeenachoiceofdrivingmotorforelectricautomobilein863projectofourcountry.ThehotanddifficultproblemsinSRMfieldhavebeenresearchedinthisthesisSRMsteadystateanddynamicstateperformanceanalysis.Theelectromagneticfiel

7、dofSRMisverycomplicatedduetoitspeculiardoublesalientconfigurationandswitchedcontrollingcircuitalthoughitsstructureissimple.TheSRMissuchakindofcomplexnonlinearsystemwithlocalhighsaturationlevelnotignorablecouplebetweenpha

8、sesandflexiblecontrolthatitisdifficulttoanalyzeitsperformanceaccuratelyusingconventionalmethod.Firstlyforthecomputationof3Dfluxlinkagewhichisadifficultproblemmethodcombinedwithmeshin3Dmagneticfieldanalysisofmotorsreconst

9、ructionhasbeenproposedbasedanalysis.ThemagneticfieldoftheendpartofSRMvariedwithrotorphasescurrentshavebeenanalyzedandtheinductancewindingsareobtained.acomputingon3DFEMpositionandcurvesoftheendpartoftheA2Dfiledcircuitmoti

10、oncoupledmodelthatcontrollingcircuitequationsarecoupleddirectlymagneticfieldFEMequationsandhasbeenpresentedtocalculatethesteadystateperformanceofSRMunderdiferentrotatingspeedanddiferentcontrollingmode.Andthefaultfromthec

11、ircuithasbeenoperatingstatethatoneofthestatorwindingsbreaksthewindingendpartsintothe2DFEMmodeltheefectsofendpartmagnetforSRMwithdiferentconfigurationanddiferentwindingconnectingtyrbeeninvestigatedinthisthesisAmethodofpre

12、dictingironcorelossesinSRMhasbeenpresentedbasedonelectromagneticfieldanalysisinwhichtheironcorelossesisestimatedbyseriesofcomponentsandcorrespondingfrequenciesoffluxdensitiesindiferentpartsofitsironcore.Theironcorelosses

13、oftheSRMoperatingatdiferentrotatingspeedareestimatedandmeasured.ConcerningthedynamicstateperformanceanalysisinvolvingcoupledproblembetweenelectromagneticandmechanicalsystemthetimesteppingFEMmodelSRM.isestablishedtopredic

14、tthestartingcharacteristicsoftheResearchandapplicationmethodvirtualworkmethodofforcecalculatingmethods.Maxwellstresstensornodalforcemethodhavebeenresearchedanddiscussedandthemethodmethodisproposeduponerintegratingpathin2

15、DMaxwellstressthodandnodalfortochooseaproptheoreticalandnumvariationoftheforceactinghasbeenanalyzedusingtheericaldemonstration.FurthermorethesimplifiedtodecreasecoamongstatorandrotorpolesofSRMwithrotorrotationnodalforcem