基于單片機的數(shù)字式軸角傳感器設計-畢業(yè)論文外文翻譯

1、DesignofDigitalTypeAxisangleSensBasedonSinglechip1a2b2cYuJianchaoYuXiangbinLiJun1ComputerScienceTechnologyCollegeofJilinUniversityGaoxinkaifaZoneChangchunChina2AircraftControlDepartmentofAviationUniversityofAirfceNanguan

2、gZoneChangchunChinaaemail:373506896@bemail:yxb1234567@cemail:lijun1234888@Keywds:RS232interfacesinglechipdigitaltypeaxisanglesenssynchronizer.Abstract.Thesynchronizerisoftenusedfthemeasurementofaxisanglebecauseofitssimpl

3、estructurereliabilityhighprecision.Buttheoutputsignalfromthesynchronizerisananalogsignalsoitisdifficulttorealizedigitalmeasurement.Thispaperintroducesameasuringcircuitbasedonasinglechip.Thiscircuitcanproduceexcitingsigna

4、lindependentlynoextraexcitingpowersupplyisneededmakingtheapplicationeasy.TheACsignalsoutputfromthesynchronizerareconvertedintoDCsignalsthenmeasureddirectlybythesinglechip.Themeasuringdataafterbeingprocessedareturnedintos

5、erialdatatooutputthroughaRS232serialinterface.Thesynchronizerequippedwiththecircuitwillbeadigitalaxisanglesens.Thesensisofhighprecisionreliabilitylowpriceeasyapplicationhighpracticalvalue.1.IntductionThesynchronizerisoft

6、enusedfthemeasurementofaxisanglebecauseofitssimplestructurereliabilityhighprecision.Theoutputsignalfromthesynchronizerusuallyismeasuredbyakindofsynchronizermeasuringmoduleswhichcanoutputadigitalquantitycrespondingtotheme

7、asuredaxisangle.Butfthiskindofmodulestheextraexcitingpowersupplyusuallyisneeded[1]makingtheapplicationmeinconvenient.Inadditionthemodulecannotjointtogetherwiththe[2]synchronizerbecauseofitsbigsize.Thispaperintroducesasim

8、plemeasuringcircuittomeasurethesignalfromthesynchronizer.Thecircuitcanproduceexcitingsignalindependentlynoextraexcitingpowersupplyisneededmakingtheapplicationeasy.TheACsignalsoutputfromthesynchronizerareconvertedintoDCsi

9、gnalsthenmeasureddirectlybythesinglechip.ThemeasuringdataafterbeingprocessedareturnedintoserialdatatooutputthroughaRS232serialinterface.Thesmallsizeofthecircuit’sPCBmakeitpossibletojointtogetherwiththesynchronizer.Thesyn

10、chronizerequippedwiththismeasuringcircuitwillbeabletorealizeadigitalsignaloutputsothedesignhasahigherpracticability.2.SynchronizerOperatingPrincipleThesynchronizerconsistsofarotwindingthreestatwindingsconnectedinstar.Whe

11、nanexcitingpowersupplyisappliedontherotwindingthethreestatwindingswillproduceinducede.m.f.Therelationshipbetweentheamplitudeoftheinducede.m.f.thegivenaxisanglecanbeexpressedbytheequations:U=Ucos(α)U=Ucos(α120)，U=Ucos(α24

12、0)UistheAmBmCmm[3]maximumamplitudeoftheinducede.m.f.Thesynchronizerhasnodletapsotheaxisanglecanonlybeobtainedbymeasuringthetwoendvoltages.FexampleiftakingendAascommonendinthiscasethereare:uCA.Accding=u?u=u3sin(α?60)u=u?u

13、=?u3sin(α60)CAmBABAmtothesetwoequationstheaxisangleαcanbeknownexpressedbytheequation:3(uBA?u).SobysupplyingexcitingsignaltotherotwindingtomakethestatCAα=arctguBAuCAAllrightsreserved.Nopartofcontentsofthispapermaybereprod

14、ucedtransmittedinanyfmbyanymeanswithoutthewrittenpermissionofTransTechPublications.(ID:132.174.254.159PennsylvaniaStateUniversityUniversityParkUSA25051515:46:31)894FrontiersofManufacturingScienceMeasuringTechnologyIVThes

15、inglechip’sPinPPareTXRXoftheasynchronouscommunicationinterface0.20.3thecommunicatingratecanbesetbytheinternalregister.Becausetheasynchronouscommunicationinterfacecan’ttransmitdatainalongdistanceaRS232interfacecircuitisne

16、ededtoturntheserialsignalsfromthesinglechip’spinP0.2P0.3intoastardRS232serialcommunicationfmat.TheRS232interfacechipadoptedhereisMAX232(U)itcanmakethetransmittingdistance4reach15msothecommontransmittingdistancerequiremen

17、tcanbemet.3.2OperatingPrincipleAfterturningonthe24VpowersupplythesinglechipgoesintowkingstategeneratesasquarewavesignalcontinuouslyfrompinP.Afterbeingfilteredamplifiedthesignalbecomes0.1asinewavesignalbesenttotherotwindi

18、ngofthesynchronizertoexciteit.atthesametimethestatwindingsgenerateinducede.m.fuBAu.BymeansoftheACDCsignalCAconvertingcircuittheuBAuCAareturnedintocrespondingDCsignalUBAU.TheCAsinglechipmeasuresthetwosignalsofUBAUCAthenca

19、lculatethemeasureddataaccding3(UBA?U)UBAUCAtothefmulaα=arctgtogettheaxisangleofthesynchronizer.finallytheresultisCAsentoutthroughtheRS232interface.4.SoftwaredesignThespecificfunctionblockdiagramofthesoftwareisshowninFig.

20、2.Firstlyinitializethesinglechipsettingthesinglechip’ssystemclocktheIOpt’sfunctionthesamplingchannelfrequencyoftheADconverterthefrequencyoutputmodeofPCA0thecommunicationmodefrequencyoftheasynchronousserialcommunicationin

21、terface.SecondlyPCA0generatesasquarewavesignaloutputsitfrompinPcontinuouslytoexcite0.1thesynchronizeratthesametimetheADconvertsamplestheDCsignalUBAUCAoutputfromtheACDCsignalconvertingcircuit.Thirdlycalculatetheaxisanglea

22、ccdingtothesampleresult.FinallysendoutthemeasuredresultbytheasynchronousserialcommunicationinterfacetroughMAX232.thengotothenextcycle.StartInitializesinglechipSendsquarewaveSampleUBAUCADataprocessSendoutresultFig.2Softwa