嵌入式鼠籠斷條智能在線檢測系統(tǒng)的研究.pdf

1、天津大學碩士學位論文嵌入式鼠籠斷條智能在線檢測系統(tǒng)的研究姓名：李桂丹申請學位級別：碩士專業(yè)：電機與電器指導教師：王曉遠20031201ABSTRACTABSTRACTBecauseoftheirsimplestructure，lowpriceandhighreliabilitysquirrelcageiaductionmotorsarewidelyusedinmanyaspectsButnlechanicalfaultssuchasbr

2、eakageofrotorbarsoftenhappenowingtovariousstressesThereforeonlinedetectiononinductionmotorsisnecessaryThemethodadoptedinthispaperiScalledMotorCurrentSignatureAnalysis(MCSA)Itdetectsbrokenrotorbarsaccordingtotheamplitudeo

3、fthe(卜2s)，ifrequencycomponentinstatorcurrentsignalThispaperproposedanovelmethodwhichiSbasedoncontinuousandsubdividedFourierTranSfornl(FTl，waveletpacketdecomposition(WPD)，BPartificialneuralnetwork(ANN)and‘energy—fault’dia

4、gnosismodeforthefirsttimeUndersteadyloadconditionamethodbasedoncontinuousandsubdividedFTiSproposedThestatorcurrentsivaunderoperationconditionisanalyzedwithcontinuousandsubdividedFtAnovelarithmeticisproposedforthefirsttim

5、etocounteractthefundamentalcomponenL耵leproblemthatthe(1—2sYi丹equencycomponentissubmergedbythefundamentalcomponentissolvedcompletelyWPDisadoptedbecausethespectrumofthestatorcurrentcannotbegainedcorrectlybvFTwhentheloadtor

6、queiSfluctuantTheWPDtoefficientsofstatorcurrentsignalanderoperationconditionareusedtojudgewhetherthe10adtorqueisfluctuantandteadthefluctuantpointsnlesignal’SenergyintherangeofsteadystateiSusedtocalculatetheamplitudeof血ef

7、undamentalcomponentwhichisselectedastheinputofBPANNtogetherwiththeenergYofWPDtoe販cientsintherangeofsteadystateofspecialnodeTheresultofANNistheamplitudeofther12sl／ifrequencycomponent11heinformationoffaultdegreeisgainedfro

8、mtwoamplitudesabovementionedUndersteadyconditionthismethodandtheabovemethodbasedoncontinuousandsubdividedFTCantestifyeachothertoincreasethedetectionveracityAnintelligentonlinedetectorbasedonembeddedPCsystemforbrokenrotor

9、barsismanufacturedSBCCessfullyThissystemhasadvantagesofhighintegrationlevel，smallvolume，lowpowerhighstabilityandreliabilityMoreoverithasthesameprogramprotocolwithordinaryPCExperimentresultsshowtheaccuracyoftheproposedmet

10、hodforbrokenrotorbardetectioninsquirrel—cageinductionmotorsunderbothsteadyandfluctuantloadconditionKeywords：SquirrelCageI，nductionMotorBrokenRotorBarFourierTransformWaveletPacketDecomposition，ArtificialNeuralNetwork，Embe