电动卷扬机的控制——机械专业毕业设计论文外文翻译（中英文翻译、外文文献翻译）

电动卷扬机的控制机械专业毕业设计论文外文翻译（中英文翻译、外文文献翻译）英文原文ELECTRICALWINCHCONTROLSBYTOMYOUNGTHEFORMOFMOTORCONTROLWEALLKNOWBESTISTHESIMPLEMANUALSTATIONWITHUPANDDOWNPUSHBUTTONSWHILETHESESTATIONSMAYSTILLBETHEPERFECTCHOICEFORCERTAINAPPLICATIONS，ADIZZYINGARRAYOFMORESOPHISTICATEDCONTROLSISALSOAVAILABLETHISARTICLEADDRESSESTHEBASICELECTRICALREQUIREMENTSOFTHEMOTORSANDUSERINTERFACEISSUESYOUWILLNEEDTOADDRESSBEFORESPECIFYING，BUILDINGORBUYINGWINCHCONTROLSTOBEGINWITH，THEMANUALCONTROLSTATIONSSHOULDBEOFTHEHOLDTORUNTYPE，SOTHATIFYOUTAKEYOURFINGEROFFOFTHEBUTTONTHEWINCHSTOPSADDITIONALLY，EVERYCONTROLSTATIONNEEDSANEMERGENCYSTOPESTOPTHATKILLSALLPOWERTOTHEWINCH，NOTJUSTTHECONTROLCIRCUITTHINKABOUTITIFTHEWINCHISNTSTOPPINGWHENITSHOULD，YOUREALLYNEEDAFAILSAFEWAYTOKILLTHELINEPOWERITSALSOAGREATIDEATOHAVEAKEYOPERATEDSWITCHONCONTROLSTATIONS，ESPECIALLYWHEREACCESSTOTHESTATIONSISNOTCONTROLLEDSAFEOPERATIONBYAUTHORIZEDPERSONNELMUSTBECONSIDEREDWHENDESIGNINGEVENTHESIMPLESTMANUALCONTROLSCONTROLLINGFIXEDSPEEDMOTORSTHEACTUALCONTROLLINGDEVICEFORAFIXEDSPEEDWINCHISATHREEPHASEREVERSINGSTARTERTHEMOTORISREVERSEDBYSIMPLYSWITCHINGTHEPHASESEQUENCEFROMABCTOCBATHISISACCOMPLISHEDBYTWOTHREEPOLECONTACTORS，INTERLOCKED，SOTHEYCANTBOTHBECLOSEDATTHESAMETIMETHENECREQUIRESBOTHOVERLOADANDSHORTCIRCUITPROTECTIONTOPROTECTTHEMOTORFROMOVERHEATINGDUETOMECHANICALOVERLOADSATHERMALOVERLOADRELAYISBUILTINTOTHESTARTERTHISHASBIMETALLICSTRIPSTHATMATCHTHEHEATINGPATTERNOFTHEMOTORANDTRIPSCONTACTSWHENTHEYOVERHEATALTERNATIVELY，ATHERMISTORCANBEMOUNTEDINTHEMOTORWINDINGTOMONITORTHEMOTORTEMPERATURESHORTCIRCUITPROTECTIONISGENERALLYPROVIDEDBYFUSESRATEDFORUSEWITHMOTORSASEPARATELINECONTACTORSHOULDBEPROVIDEDAHEADOFTHEREVERSINGCONTACTORFORREDUNDANCYTHISCONTACTORISCONTROLLEDBYTHESAFETYCIRCUITSESTOPANDOVERTRAVELLIMITSTHISBRINGSUSTOLIMITSWITCHESWHENYOUGETTOTHENORMALENDOFTRAVELLIMITTHEWINCHSTOPSANDYOUCANONLYMOVEITINTHEOPPOSITEDIRECTIONAWAYFROMTHELIMITTHEREALSONEEDSTOBEANOVERTRAVELLIMITINCASE，DUETOANELECTRICALORMECHANICALPROBLEM，THEWINCHRUNSPASTTHENORMALLIMITIFYOUHITANOVERTRAVELLIMITTHELINECONTACTOROPENSSOTHEREISNOWAYTODRIVEOFFOFTHELIMITSIFTHISOCCURS，ACOMPETENTTECHNICIANNEEDSTOFIXTHEPROBLEMTHATRESULTEDINHITTINGTHEOVERTRAVELLIMITTHEN，YOUCANOVERRIDETHEOVERTRAVELSUSINGTHESPRINGRETURNTOGGLESWITCHINSIDETHESTARTERASOPPOSEDTOUSINGJUMPERSORHANDSHOOTINGTHECONTACTORSVARIABLESPEEDREQUIREMENTSOFCOURSE，THESIMPLEFIXEDSPEEDSTARTERGETSREPLACEDWITHAVARIABLESPEEDDRIVEHERESWHERETHINGSSTARTTOGETINTERESTINGATTHEVERYLEASTYOUNEEDTOADDASPEEDPOTTOTHECONTROLSTATIONAJOYSTICKISABETTEROPERATORINTERFACE，ASITGIVESYOUAMOREINTUITIVECONTROLOFTHEMOVINGPIECEUNFORTUNATELY，YOUCANTJUSTORDERANYOLDVARIABLESPEEDDRIVEFROMYOURLOCALSUPPLIERANDEXPECTITTORAISEANDLOWEREQUIPMENTSAFELYANDRELIABLYOVERKIDSONSTAGEMOSTVARIABLESPEEDDRIVESWONT，ASTHEYARENTDESIGNEDFORLIFTINGTHEDRIVENEEDSTOBESETUPSOTHATTORQUEISDEVELOPEDATTHEMOTORBEFORETHEBRAKEISRELEASED，ANDWHENSTOPPINGTHEBRAKEISSETBEFORETORQUEISTAKENAWAYFORMANYYEARSDCMOTORSANDDRIVESPROVIDEDAPOPULARSOLUTIONASTHEYALLOWEDFORGOODTORQUEATALLSPEEDSTHELARGEDCMOTORSREQUIREDFORMOSTWINCHESAREEXPENSIVE，COSTINGMANYTIMESWHATACOMPARABLEACMOTORCOSTSHOWEVER，THEEARLYACDRIVESWERENOTVERYUSEFUL，ASTHEYHADAVERYLIMITEDSPEEDRANGEANDPRODUCEDLOWTORQUEATLOWSPEEDSMORERECENTLY，ASTHEACDRIVESIMPROVED，THELOWCOSTANDPLENTIFULAVAILABILITYOFACMOTORSRESULTEDINATRANSITIONTOACDRIVESTHEREARETWOFAMILIESOFVARIABLESPEEDACDRIVESVARIABLEFREQUENCYINVERTERSAREWELLKNOWNANDREADILYAVAILABLETHESEDRIVESCONVERTACTODC，THENCONVERTITBACKTOACWITHADIFFERENTFREQUENCYIFTHEDRIVEPRODUCES30HZ，ANORMAL60HZMOTORWILLRUNATHALFSPEEDINTHEORYTHISISGREAT，BUTINREALITYTHEREAREACOUPLEOFPROBLEMSFIRST，ATYPICAL60HZMOTORGETSCONFUSEDATALINEFREQUENCYBELOW2OR3HZ，ANDSTARTSTOCOGJERKANDSPUTTER，ORJUSTSTOPSTHISLIMITSYOUTOASPEEDRANGEOFASLOWAS201HARDLYSUITABLEFORSUBTLEEFFECTSONSTAGESECOND，MANYLOWERCOSTINVERTERSAREALSOINCAPABLEOFPROVIDINGFULLTORQUEATLOWSPEEDSEMPLOYINGSUCHDRIVESCANRESULTINJERKYMOVES，ORACOMPLETEFAILURETOLIFTTHEPIECEEXACTLYWHATYOUDONTWANTTOSEEWHENYOUARETRYINGTOSTARTSMOOTHLYLIFTINGASCENICELEMENTSOMEOFTHENE