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首页 冰箱压缩机电机常见故障分析

冰箱压缩机电机常见故障分析.doc

冰箱压缩机电机常见故障分析

劈腿de年代谁相信真爱
2018-12-24 0人阅读 举报 0 0 暂无简介

简介:本文档为《冰箱压缩机电机常见故障分析doc》,可适用于社会民生领域

冰箱压缩机电机常见故障分析AnalysisofcommontroublesinrefrigeratorcompressormotorThecompressorofeachtyperefrigeratorismostlyclosedtype,thatis,thecompressorandmotoraresealedinthesamesteelshellThissplitphaseinductionmotorhaslesspower,aboutwwGeneralsplittypesinglephaseinductionmotor,higherspeed,rpmInthestatorcoilofthiskindofmotor,besidesaroughrunningwinding,asetofstartingwindingwithsmallerlinediameterisalsospeciallysetupTherunningwindingandthestartingwindingworktogethertoproducealargerstartingtorque,andthemotorrotorrotatesSincethestartofthemotorwindingwirediameterisverysmall,theresistancevalueislarge,thetemperatureriseishigher,ifthemotorisstartedlongtimeiseasytoburn,sowhenthemotorstartsafterafewseconds,reachesacertainspeed,startrelayautomaticallytostartwindingoff,onlybytherunningwindingcontinuedBecauseoftheparticularityofthiskindofmotor,andsealedinasteelcasingcompressor,themotorspeedishigh,sooncethesupplyvoltageinstabilityormechanicalfailure,willcausethemotortemperaturerisetoohighandcausemalfunctionThecommonfaultsaremainlythemotormainbearingsleevewear,themotortemperatureriseistoohigh,thecompressorislackoflubricatingoil,themotorheating,motorlongtimeoverloadoperationandmotorleakageproblemsmotorspindlewearBecausethemotorandthecompressoraresealedtogether,thelowerpartoftherotorcentershaftofthemotorisanoilsuctionpipe,andtheupperendisacrankshaftofthecompressor(forreciprocatingcompressor)Whenthemotorrotorwiththecentralaxisofthehighspeedoperation,becauseonlybyacopperbearingsleevebearing,andthegapbetweentherotorandthestatorisonlyaboutmm,oncethebearingsleevewearandlooseningbetweentheshaftandthehole,sothatthemotorrotorcausedbyeccentricswinginoperation,frictionresistanceincreases,causingthemotorcurrentincreasesrapidlyso,toburnoutthemotorwindingheatForsuchfailures,inthedemolitionofthecompressorhousing,shouldcarefullycheckthemotorshaftsleeveholewear,oncefoundthatthebearingborediameterwearmorethanmm,shouldreplacethebearingintimethetemperatureriseofmotorisseriousIntheactualoverhaulprocess,itisfoundthattheshelltemperatureofthecompressoristoohigh,whichcanbeanalyzedfromthefollowingaspectsOneisthedeteriorationoftherefrigerantoilinthesteelhousing,therebyincreasingwearbetweenthecompressorpartsCompressoroil(refrigerantoil)isaverypuretransparentliquidItisakindofspecialoilsuitableforlongtimeintheenvironmentofhightemperatureandlowtemperatureOncetheoildeterioration,turbidityandsticky,willexacerbatethecompressormechanicalwear,oilblocking,leadingtoalargetemperaturemotorandburnedthemotorThesecondisthelackoflubricatingoilinthesteelshellofthecompressor,whichmakesthecompressormovingpartslackofoilsupply,sothatthemetalsurfaceofeachcomponentisrubbedagainsteachother,causingthemotorloadtobeaggravated,andthewindingheatandthetemperaturerisesharplyThethirdistheinteriorofthemotorwindingshortcircuit,ifthecompressorinlongtermoverloadoperationforalongtime,thevariationofthemotorsubjectedtohotandcoldtemperatureinthecasing,orthecompressorstartandstopfrequently,willcausethemotorwindinginsulationagingandshortheatingCheckwhetherthemotorisshortornotandmeasuretheresistancevalueofeachwindingWhenthestartingwindingofageneralmotorhasnoshortcircuit,theresistancevalueisaboutWhentherunningwindingisshortcircuited,theresistancevalueisabout,andthestartingandrunningwindingresistancevalueisaboutIfthemotorwindingisshortcircuited,itsresistancevalueismuchlessthanthenormalvalueIfsomepartsoftherefrigeratorcapillary,orpipefilterclogging,alsowillcausethesuctionpressureofthecompressortoreduceorincreasetheexhaustpressure,therebyincreasingtheoperatingloadofthecompressor,thetemperatureofthemotorcausedaseriousincreaseReprinted,pleasenotefromthe"maintenance","themotorgeneratesleakagefaultTheleakageofthemotorinthesteelshellofthecompressorwillleadtotheliveelectrificationoftherefrigeratorandbringseriousdangertothesafetyAnalysisofmaincausesofelectricleakage,themainmotorwireinsulationagingandleadtorupture,baresteelshellconductivetouchSecondly,themotorisseriouslydamaged,resultinginleakageofthewholemotorOfcourse,theremaybeinthedemolitionofthecompressorrepair,duetopoorassemblyorinsulatedwirequality,resultingintheuseofnotlongtime,theelectricalinsulationperformancewilldeclineandleakageInviewoftheabovesituation,indetectingwhetherthemotorleakage,themotorcanbethreeleadout,theshellwithaEuropeanshaketable,measuringtheresistance,insulationvaluetobejudgedIfyoudonothaveadedicatedEuropeanshakewatch,youcanusetheincandescentlampstringconnectiontestSpecificdetectionmethodofthemotoristhreeleadwiresdanglingfromthewiringcolumnremoved,willfirethepowerlineisconnectedinserieswithamotorleadwire(eachmeasuringachange,thentheroot)willonlyasmallnumberofwattincandescentbulbsareconnectedinseriesbetweenthecasingandtheground,whenthepowersupplylinetouchthemotorwithaleadwire(startline,runtheline,startrunningline),brightlightbulbthatelectricleakageShouldbenotedthatthewholerefrigeratorisnotleakage,leakagecausedbycompressionmotor,suchascircuitsystem,refrigeratorthermostat,relay,lightingsystemfailurewillcauseleakage,onlytheexclusionofthefaultiscleared,tocheckwhetherthemotoriscompressedleakage,onceconfirmedthemotorleakagefault,onlythroughthecompressorthesteelshellremovedforrepairorreplacementofmotor

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冰箱压缩机电机常见故障分析

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