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外文翻译--现代变频器技术分析.doc

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外文翻译--现代变频器技术分析.doc

MODERNFREQUENCYCHANGERTECHNICALANALYSISCHENGXIHEILONGJIANGLONGMAYMININGGROUPCO,LTDTHEGENERALFREQUENCYCHANGERBYITSMERITSANDSOONINTELLECTUALIZATION,DIGITIZATION,NETWORKRECEIVESPEOPLESFAVORMOREANDMORE,BUTALONGWITHTHEGENERALFREQUENCYCHANGERAPPLICATIONSCOPESEXPANSION,EXPOSESSOMEQUESTIONSINVIEWOFTHESEQUESTIONS,THISARTICLECARRIEDONHASANALYZEDANDPROPOSEDTHECOUNTERMEASUREFIRST,OVERTONEQUESTIONANDCOUNTERMEASURETHEGENERALFREQUENCYCHANGERSMAINCIRCUITFORMGENERALLYBYTHERECTIFICATIONPART,THECONTRAVARIANTPARTANDTHEFILTERPARTISCOMPOSEDTHERECTIFICATIONPARTFORTHETHREEPHASEBRIDGETYPEUNCONTROLLEDRECTIFIER,THEINVERTORSPARTISTHEIGBTTHREEPHASEBRIDGETYPEINVERTORS,ANDTHEOUTPUTISTHEPWMPROFILEBECAUSETHEGENERALFREQUENCYCHANGERSRECTIFICATIONPARTUSESTHEDIODEUNCONTROLLEDBRIDGETYPELEVELINGCIRCUIT,THEMIDDLEFILTERPARTUSESTHEBIGELECTRICCAPACITYTOTAKETHEFILTER,THEREFORERECTIFIERSINPUTCURRENTINFACTISCAPACITORSCHARGINGCURRENT,ASSUMESAHIGHERMOREANDPRECIPITOUSPULSEWAVE,ITSHARMONICCOMPONENTISBIGFORTHEHARMONICCANCELLATION,MAYUSE1,INCREASESTHEFREQUENCYCHANGERELECTRICPOWERSUPPLYINTERNALRESISTANCEUSUALLYINTHESITUATION,POWEREQUIPMENTSINTERNALRESISTANCEMAYPLAYTHECUSHIONFREQUENCYCHANGERCONCURRENTFILTERELECTRICCAPACITYSREACTIVEPOWERROLETHISKINDOFINTERNALRESISTANCEISTRANSFORMERSSHORTCIRCUITIMPEDANCEWHENPOWERSOURCECAPACITYRELATIVEFREQUENCYCHANGERCAPACITYHOUR,THENTHEINTERNALRESISTANCEVALUERELATIVELYISBIGGER,THEHARMONICCONTENTISSMALLER;WHENTHEPOWERSOURCECAPACITYRELATIVEFREQUENCYCHANGERCAPACITYISBIGGER,THENTHEINTERNALRESISTANCEVALUERELATIVELYISBIGGER,THEHARMONICCONTENTISBIGGERTHEREFOREBESTCHOICESHORTCIRCUITIMPEDANCEBIGTRANSFORMER2,INSTALLSTHEREACTORINSTALLSTHEREACTORISACTUALLYINCREASESTHEFREQUENCYCHANGERELECTRICPOWERSUPPLYSINTERNALRESISTANCEFROMEXTERIORINSTALLSTHEDIRECTCURRENTREACTORINFREQUENCYCHANGERSEXCHANGESIDEINSTALLMENTEXCHANGEREACTORORINFREQUENCYCHANGERSDIRECTCURRENTSIDE,ALSOORINSTALLS,SUPPRESSESTHEHARMONICCURRENT3,TRANSFORMERHETEROGENEITYMOVEMENTTHEGENERALFREQUENCYCHANGERSRECTIFICATIONPARTISSIXPULSEWAVERECTIFIERS,THEREFOREPRODUCESTHEOVERTONEISBIGIFUSINGTRANSFORMERSHETEROGENEITYMOVEMENT,CAUSESPHASEANGLEMUTUALDEVIATION30LIKEY△,△△THECOMBINATIONTWOTRANSFORMERCONSTITUTIONTOBEEQUALTO12PULSEWAVEEFFECTS,THENMAYREDUCETHELOWORDERHARMONICCURRENT28,PLAYSTHEHARMONICSUPPRESSIONROLE4,ADJUSTSFREQUENCYCHANGERSCARRIERRATIOSOLONGASCARRIERCOMPAREDTOENOUGHBIG,ISINFERIORTHEOVERTONETOBEPOSSIBLETOSUPPRESSEFFECTIVELY,SPECIALLYTHEREFERENCEWAVEPEAKTOPEAKVALUEANDTHECARRIERPEAKTOPEAKVALUEARESMALLERTHAN100,13FOLLOWINGODDNUMBEROVERTONESNOLONGERAPPEAR5,SPECIALPURPOSEFILTERTHESPECIALPURPOSEFILTERUSEINEXAMININGTHEFREQUENCYCHANGERHARMONICCURRENTTHEPEAKTOPEAKVALUEANDTHEPHASE,ANDPRODUCESONEWITHTHEHARMONICCURRENTPEAKTOPEAKVALUETOBETHESAME,BUTTHEPHASEJUSTRIGHTOPPOSITEELECTRICCURRENT,PASSESTHROUGHINTHEFREQUENCYCHANGER,ABSORPTIONHARMONICCURRENTSECOND,MATCHINGOFLOADQUESTIONANDCOUNTERMEASUREPRODUCESMACHINERYSTORQUECHARACTERISTICSTODIVIDEINTOTHREETYPESROUGHLYPERMANENTTORQUELOADING,AIRBLOWERPUMPCLASSLOADANDPERMANENTPOWERTERMINATIONINVIEWOFTHEDIFFERENTLOADTYPE,SHOULDCHOOSETHEDIFFERENTTYPETHEFREQUENCYCHANGER1,PERMANENTTORQUELOADINGTHEPERMANENTTORQUELOADINGISREFERSTOTHELOADMOMENTTOHAVENOTHINGTODOWITHTHEROTATIONALSPEED,UNDERANYROTATIONALSPEED,THETORQUEMAINTAINSCONSTANTBUTTHEPERMANENTTORQUELOADINGDIVIDESINTOTHEFRICTIONCLASSLOADANDTHEPOTENTIALENERGYTYPECAPACITYTWOKINDS2,AIRBLOWERPUMPCLASSLOADTHEAIRBLOWERPUMPCLASSLOADISPRESENTINDUSTRYFIELDAPPLICATIONMOSTEQUIPMENT,ALTHOUGHTHEPUMPANDAIRBLOWERSCHARACTERISTICAREMANYANDVARIED,BUTMAINLYBYTHECENTRIFUGALPUMPANDTHECENTRIFUGALFANAPPLICATION,THEGENERALFREQUENCYCHANGERSAREPRIMARILYMOSTINTHISKINDOFLOADAPPLICATIONTHISKINDOFLOADISNOTHIGHTOFREQUENCYCHANGERSPERFORMANCEREQUIREMENT,ONLYREQUESTSTHEEFFICIENCYANDTHERELIABILITY,THEREFORETHECHOICEHASTHEU/FCONSTCONTROLMODELFREQUENCYCHANGERTHEN,LIKEMITSUBISHIFREQUENCYCHANGERFRF540LSERIESAIRBLOWERLOADINACTUALMOVEMENTPROCESS,BECAUSETHEROTORINERTIAISQUITEBIG,THEREFOREFREQUENCYCHANGERSRISETIMEANDTHEDECELERATIONTIMEAREAVERYIMPORTANTQUESTIONTHEAIRBLOWERLOADSSYSTEMROTORINERTIACOMPUTATIONISVERYIMPORTANTWHENFREQUENCYCHANGERCONCRETEDESIGN,ACCORDINGTOTHECOMPUTEDRESULT,CARRIESONTHESUITABLEREVISION,WHENTHEFREQUENCYCHANGERSTARTSDOESNOTOCCURTHEOVERFLOWTRIPANDTHEFREQUENCYCHANGERDECELERATEWHENDOESNOTHAVEINTHEOVERVOLTAGETRIPSITUATION,CHOICESHORTESTTIMEBUTTHEPUMPCLASSLOADINTHEACTUALMOVEMENTPROCESS,EASYTOHAVETHEBUZZ,THEBUILDTHEPRESSUREANDTHEWATERHANGSTHEEFFECT,THEREFORETIMEFREQUENCYCHANGERSHAPING,MUSTCHOOSEISSUITABLEFORTHEPUMPCLASSLOADTHEFREQUENCYCHANGER,ANDFREQUENCYCHANGERINFUNCTIONHYPOTHESISTIMEMUSTAIMATTHEABOVEQUESTIONTOCARRYONESTABLISHESALONE3,PERMANENTPOWERTERMINATIONTHEPERMANENTPOWERTERMINATIONREFERSTOTHELOADWHICHTHETORQUEROUGHLYANDTHEROTATIONALSPEEDISINREVERSEPROPORTION,LIKECOILER,UNWINDINGCOILERANDSOONSPEAKINGOFCERTAINSPEEDCHANGESCOPE,WHENACTUATESTHEPERMANENTPOWERTERMINATIONUSINGTHEFREQUENCYCHANGER,USUALLYTHECONSIDERATIONSELECTSTHEPERMANENTTORQUEVELOCITYMODULATIONMETHODBELOWSOMEROTATIONALSPEED,WHENISHIGHERTHANTHISROTATIONALSPEEDONLYTHENSELECTSTHEPERMANENTPOWERVELOCITYMODULATIONMETHODUSUALLYISCALLEDTHISROTATIONALSPEEDSPOTSTHEBASEFREQUENCY,BUTTHISPOINTCORRESPONDENCESVOLTAGEOUTPUTSTHERATEDVOLTAGEFORTHEFREQUENCYCHANGERTHIRD,GIVESOFFHEATTHEQUESTIONANDTHECOUNTERMEASUREFREQUENCYCHANGERSGIVINGOFFHEATISPRODUCESBYTHEINTERNALLOSSCARRIESONTHERADIATIONTOTHEFREQUENCYCHANGER,USUALLYUSE1,USESTHEVENTILATORRADIATIONFREQUENCYCHANGERSINTERNALINSTALLATIONVENTILATORMAYCARRYOFFFREQUENCYCHANGERSBOXBODYINTERIORRADIATION,IFTHEVENTILATORCANNOTTHENORMALWORK,IMMEDIATELYSTOPTHEFREQUENCYCHANGERMOVEMENT2,REDUCESINSTALLSTHEAMBIENTTEMPERATUREGENERALFREQUENCYCHANGERSENVIRONMENTOPERATINGTEMPERATUREGENERALREQUESTIN10℃TO50℃,IFCANTAKETHEMEASURETOREDUCETHEFREQUENCYCHANGEROPERATINGTEMPERATUREASFARASPOSSIBLE,THENFREQUENCYCHANGERSSERVICELIFELENGTHENS,THEPERFORMANCEISALSOQUITESTABLEMAYADOPTTWOMETHODSREGARDINGTHISQUESTIONFIRST,CONSTRUCTSTHEINDEPENDENTFREQUENCYCHANGERLOWPRESSURE,THEINTERIORINSTALLSTHEAIRCONDITIONING,MAINTAINSTHELOWPRESSURETHETEMPERATUREIN15℃TO20℃BETWEEN;SECOND,FREQUENCYCHANGERSINSTALLMENTSPACENEEDSTOSATISFYTHEFREQUENCYCHANGERINSTRUCTIONFORUSETHEREQUESTTHEABOVETALKSABOUTTHEFREQUENCYCHANGERGIVESOFFHEATISREFERSTOTHEFREQUENCYCHANGERINTHERATEDRANGETHENORMALOPERATIONLOSSWHENTHEFREQUENCYCHANGERHASTHEUNUSUALMOVEMENTFOREXAMPLEOVERFLOW,WHENCROSSESPRESSURE,THELOSSWHICHOVERLOADANDSOONPRODUCES,MUSTAVOIDTHISKINDOFPHENOMENONTHROUGHTHENORMALSHAPINGTHEOCCURRENCEREGARDINGTHEAIRBLOWERPUMPCLASSLOAD,TAKEMITSUBISHIFREQUENCYCHANGERFRF540ASTHEEXAMPLE,WHENTHEFREQUENCYCHANGERISOPPOSITEINITSRATEDLOAD120OVERLOADS,ITSDURATIONIS60SECONDS,ANDDOESNOTALLOWWITHIN300SECONDSTOPRESENTTHESECONDOVERLOADWHENTHEFREQUENCYCHANGERPRESENTSTHEOVERLOAD,BECAUSETHEPOWERUNITITWINDSTHROUGHTHEEXCESSCURRENTELEVATESTEMPERATURE,CAUSESTHEFREQUENCYCHANGEROVERHEATED,BYMUSTCAUSEITSTEMPERATUREDECREASETOCAUSEFREQUENCYCHANGERSOVERHEATEDPROTECTIONMOVEMENTASSOONASPOSSIBLETOELIMINATE,THISUNDERCOOKINGISFREQUENCYCHANGERSOVERLOADCYCLETHEDIFFERENTFREQUENCYCHANGER,ITSOVERLOADMULTIPLE,THEOVERLOADTIMEANDTHEOVERLOADCYCLEARENOTSAME,ANDITSOVERLOADMULTIPLEISBIGGER,THEOVERLOADTIMEISSHORTERELECTRICALMACHINERYWHICHACTUATESREGARDINGTHEFREQUENCYCHANGER,MAYDIVIDEINTOTWOKINDSACCORDINGTOITSWORKINGCONDITIONLONGTERMWORKINGSYSTEMANDREDUNDANTSHORTTIMEWORKINGSYSTEMTHELONGTERMWORKINGSYSTEMSELECTRICALMACHINERYMAYACCORDITSNAMEBRANDSTIPULATIONDATALONGTERMMOVEMENTINVIEWOFTHISKINDOFLOAD,THEFREQUENCYCHANGERMAYCARRYONTHESHAPINGACCORDINGTOTHEELECTRICALMACHINERYDATAPLATEDATA,LIKECONTINUOUSRUNNINGOILPUMP,IFITSELECTRICALMACHINERYPOWERISTIME22KW,MAYCHOOSETHEFRF54022KFREQUENCYCHANGERTHENTHEREDUNDANTSHORTTIMEWORKINGSYSTEMELECTRICALMACHINERY,ITSCHARACTERISTICISTHEDUPLICATIONANDSHORTTIME,NAMELYELECTRICALMACHINERYSOPERATINGTIMEANDTHEIDLETIMECARRIESONALTERNATELY,MOREOVERISQUITESHORT,THETWOSUM,ACCORDINGTOTHECOUNTRYSTIPULATEDTHATDONOTSURPASSFOR60SECONDSTHEREDUNDANTSHORTTIMEWORKINGSYSTEMELECTRICALMACHINERYPERMITSITSOVERLOAD,ANDHASCERTAINELEVATIONOFTEMPERATURETHISTIME,IFCHOOSESTHEFREQUENCYCHANGERACCORDINGTOTHEELECTRICALMACHINERYDATAPLATEDATA,WILLCREATEFREQUENCYCHANGERSDAMAGEINEVITABLYINVIEWOFTHISKINDOFLOAD,THEFREQUENCYCHANGERINTHEREFERENCEELECTRICALMACHINERYDATAPLATEDATASSITUATIONMUSTACCORDINGTOTHEELECTRICALMACHINERYLOADDIAGRAMANDFREQUENCYCHANGERSOVERLOADMULTIPLE,THEOVERLOADTIME,ANDTHEOVERLOADCYCLECOMESTHESHAPINGIFISREDUNDANTTHESHORTTIMEMOVEMENTTHEELEVATOR,ITSELECTRICALMACHINERYPOWERIS185KW,MAYCHOOSETHEFRA54022KFREQUENCYCHANGERTHROUGHHASTHEPROBLEMTOTHEGENERALFREQUENCYCHANGERMOVEMENTPROCESSINTHEANALYSIS,PROPOSEDSOLVESTHESEQUESTIONACTUALCOUNTERMEASURE,ALONGWITHTHE

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