会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--变频技术的普及前景.doc

  • 资源星级:
  • 资源大小:95.00KB   全文页数:15页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--变频技术的普及前景.doc

英文原文1FrequencyVariationSpeedControl1.1ThePopularityandProspectofFrequencyVariationSpeedControlTheelectricalmachineryexchangefrequencyconversionvelocitymodulationtechnologyistheelectricitysaving,theimprovementtechnicalprocessimprovestheproductqualityandtheimprovementenvironment,theimpetustechnologyadvancementonemainmethodnowThefrequencyconversionvelocitymodulationbyitsoutstandingvelocitymodulationandthebrakingquality,thehighefficiency,thehighpowerfactorandtheelectricitysavingeffect,thewidespreadapplicablescopeandothermanymeritsbythedomesticgrandfatherwasthoughtmosthasthedevelopmentfuturevelocitymodulationway.Theelectricaltransmissioncontrolsystemusuallybytheelectricmotor,thecontroldeviceandtheinformationinstalls3partstobecomposed,theelectricaltransmissionrelatesusestheelectricmotorbytosavetheelectricalenergyandtocontrolthemachineryreasonablytheoperatingcondition,therealizationelectricalenergymechanicalenergytransformation,achieves,thehighproduction,thelowconsumptiongoalhighquality.Theelectricaltransmissiondividesintodoesnotmodulatevelocityandmodulatesvelocitytwobigkinds,thevelocitymodulationisdividedtheexchangetomodulatevelocityandtodirectcurrentmodulatesvelocitytwoways.ThevariablespeedmotordirectlydoesnotsupplypowerbytheelectricalnetworkButthemachinerywhichdoesnotmodulatevelocityalongwithelectricpowerelectronictechnologydevelopmentthiskindoforiginalmanuscriptmoreandmoremanychangestothevelocitymodulationtransmissionbytosavetheelectricalenergyTheimprovementproductquality,enhancestheoutputThereforethevelocitymodulationtransmissionisanimportantprofession,alreadyobtainedthecountrytotake,atpresenthadcertainscale.Inrecentyearsexchangedinthevelocitymodulationmosttobeactive,todevelopquickestisthefrequencyconversionvelocitymodulationtechnology,thefrequencyconversionvelocitymodulationisexchangesthevelocitymodulationfoundationandthebranchcontent.Thelastcenturytransformerappearancecausesthechangevoltagetobecomeverymucheasy,thushasaccomplishedahugeelectricpowerprofession.Sincelongago,thealternatingcurrentfrequencyalwaysisfixed,thefrequencyconversionvelocitymodulationtechnologyappearancecausesthefrequencytobecomemaythefulluseresources.Inthisrecent10years,thefrequencyconversiontechnologyapplicationhastheverybigdevelopmentinourcountry,andobtainedthegoodeffecttobepossibletosay,thefrequencyconversiontechnologyhasacceptedforthemajorityusers,buthadnoalternativebuttopointout,ourcountryinfrequencyconversiontechnologyapplicationaspect,withdevelopedcountrylevelShangYouverybigdisparity.Atpresent,theACmotorsweareusingnowusefrequencyvariationspeedcontrolonlyabout6,butthedevelopedcountryis6070,Japanonairblower,waterpumpfrequencyconversionvelocitymodulationuserateis10,butourcountryislessthan0.01,InJapanairconditionerusingfrequencyvariationtechniquerateis70,butourcountrysonlythenjuststartedEmbarksfromthisreality,frequencyconversiontechnologyremainhavetheverybigdevelopmentspace,weshouldcompletethepromotedapplicationworkdoggedly.Andwiththeconstantdevelopmentofcontroltechniqueandcontrolavenue,frequencyvariationspeedcontrolledhasdevelopedthevectorcontrolledfrequencyvariationvelocitymodulation,bycontrollingtheACmotorinsideactforshuntDCmotorfieldcopersflux,toenhancethepermanenttorqueoutputscopeandstaticanddynamiccharacter,maketheACmotorfrequencyvariationspeedcontrolledsystemsuperiortoDCmotorvoltagevariationspeedcontrolledsystem.Forsimplifyingthecontrolsystem,reducingthefaultrate,therehasdevelopedavectorcontrolledfrequencyvariationspeedcontrolwithoutspeedsensorwhichbasedonthevectorcontrolledfrequencyvariationspeedcontrol.Insomeapplicationwhichhavelowrequire,vectorcontrolledfrequencyvariationspeedcontrolwithoutspeedsensorcouldcompletelycomparewiththevectorcontrolledfrequencyvariationspeedcontrolthathavespeedsensor.ThevectorcontrolhastheepochmakingsignificancetotheACcurrentmotorvelocitymodulation.Frequencyvariationspeedcontrolisthebestwayinthemotorspeedmodulation,itistheperfectgearinthecompanystechnicalreformandproductrenewal,itistheessentialcompositionintheindustrialautomaticsystem,itistheassumptionofrealizingtheautomaticofproductproceedandmanagement,itisalsothepreconditioninthedevelopmentofinformationization.Inourcountrystraditionalestate,usingtheDCmotorspeedcontrolactuationaccountabout8590inthespeedcontrolledsystem,buttheACspeedcontrolledsystemaccountabout1015.Lowefficiency,badquality,largecost,highfaultratehavealreadybeenthebottleneckthatrestrainthedevelopmentofthecompany.So,wemustpromotetheadvancedACfrequencyvariationspeedcontroltechniquepositively,armsthetraditionalindustrywiththeadvancedequipment,promoteafurtherdevelopmentintheautomation,theindustrializationandtheinformationization.1.2OurCountrysDevelopmentConditioninSpeedControlledTechniqueOurcountryisadevelopingcountry,somanyproductsresearchabilityhasbehindthedevelopedcountries.Fromnowon,theproductoffrequencyvariationspeedcontrolledthatourselvesmadeonlyactforlastcentury90sintheinternational.Withthereformandopening,rapiddevelopmentofeconomic,formsalargemarket,itopenstothecountrycompanies,alsotheforeigncompanies.Manyproductsareexportedfromthedevelopedcountries,andrunswellinourcountry,satisfiedourneedinfabricationandliving.Manycopartershipcompaniesinourcountrymaketheinternationaladvancedproducts.Thedomesticcompletedepartmentindependentlyisdesigningthemanufactureinthecompletesetinstallmenttousetheforeignimportcompanyandthejointventuresupposesadvancedeach,owndeveloptheapplicationsoftware,canprovidethefirstclasselectricaltransmissioncontrolsystemforthedomesticandforeignimportantengineeringproject.Althoughobtainsverymanyresult,butshouldseebecausedomesticdevelops,theproductionproductabilityvoluntarilyisweak,isserioustotheoverseascompanysdependence.Asearlyasinthecountry85technicalattackplan,thealternatingvelocitymodulationtechniquewaslistedasthekeytechnicalattackproject,butbecauseourcountryselectricpowerandelectronicdeviceaggregatelevelisverylow,althoughtheproductionofIGBT、GTOcomponenthasintroducedtheoverseastechnique,ithasnotformedtheeconomiesofscalebenefit,almostdoesnothavetheindependentdevelopmentabilityofnewfrequencyconverterproduction,thishasaffectedthedomesticfrequencyconversionvelocitymodulationtechniquedevelopmentinthecertaindegree.InthehighefficiencyACACfrequencyconverttechnique、themotorswithoutcommutatortechniqueandsoon,thedomesticproductalsohasthesuitabledisparityinthedigitizationandthesystemreliableaspectcompareswiththeoverseaslevel,inthemediumefficiencyfrequencyconverttechnique,nearlyallproductionsuseordinaryV/Fcontrolinland,fewadoptthevectorcontroltechnique,andcannotsatisfiedthemarketrequirementinthevarietyandquality.Butinoverseas,thefrequencyconversiontechniqueobtainsthefulldevelopment,andhasobtainedtheremarkableachievementineachaspect.Inpowercomponentaspect,highvoltage、theappearanceofSCR、GTO、IGBT、IGCTwithhighcurrentcapacityandtheusinginseriesandparallel,thehighpressuredandhighefficiencyfrequencyconverterproductionobtainstheproductionandthepromotedapplication.Inmicroelectronictechniqueaspect,16bitand32bithighspeedmicroprocessorsaswellasthefastdevelopmentofDSPandASICtechnique,providedthehardwaremethodinrealizingthefrequencyconverterwhichwithhighaccuracymultipurpose.Intheoryaspect,thevectorcontrol,themagneticfluxcontrol,thetorquecontrol,theintelligentcontrol,thenewcontroltheoryandsoonhaveprovidedtherelatedrationaleforthehighperformancefrequencyconverterdevelopment,wemayseethat,intheoverall,thealternatingfrequencyconversionvelocitymodulationtechniqueinourcountryhasbigdisparitycompareswithinternationallevel.Therefore,theACfrequencyvariationspeedcontroltechniquehasthefollowingsides1Thebasicresearchofcontrolstrategyinfrequencyconverterhasalargegapcompareswiththeforeignlevel.2Thetechnicallevelofthewholemachineislowinthefrequencyconverter,althoughwehadinputcertainlypeople,materialresources,butbecauseofthedispersepower,didnotformacertainlytechniqueandproductionscale.3Allthesemiconductorpowerdeviceproductinthefrequencyconverterisblank.4CorrelativeIndustriesandrelativeIndustriesdropbehind.5Fewproductionandsale,lowreliableandtechnologicalstandards.Withthedevelopmentandimprovementinthepowerelectronictechnique,powerdivertbasedonpowerelectroniccircuittechniqueandvariouscontroltechnique,theACfrequencyvariationspeedcontrolledtechniqueismaturedaybyday,andsuretobethemainwayinthefuture.Withtheconstantdevelopmentofpowerelectronictechnique,reliablecharacter,welladoption,cheappricethatthefrequencyconverterhavewillbecometrue.Thistechniquewillgainwidely,popularityapplication.Atpresent,foreigndevelopedcountriesfrequencyconverttechniquetowardstotheminiaturization,highreliability,defendwithharm,morefunction,highcharacter,andourcountryiscomingonnow.1.3FrequencyVariationSpeedControlledModeThealternatingfrequencyconversionvelocitymodulationtechniqueobtainedtherapiddevelopmentin20thcentury.Thisisrelatedwithsomecrucialtechnicalwhichgainunprecedentedprogress,theyareMotorvectorcontroltechnique,Directtorquecontroltechnique,PWMtechnique,Entirenumericalcontroltechniqueandselfsettingtechniquewhichbasedonmicrocomputerandlargescaleintegratedcircuit,andsoon.1VectorControlTechniqueVectortransformationcontroltechniqueisaonekindofnewcontrolthoughtandcontroltheorywhichposedbySIEMENSCO.in1971.Itisrealizingthestatorcurrentexcitationcomponentandthetorquecomponentsolutionlotusrootbyrotormagneticfielddirectiondetection,andvectortransformation,achievedthegoalthatseparatelycontrolthemotorfluxlinkageandtheelectriccurrent,asaresult,obtainfinelystatic,dynamicperformance.Untilnow,thevectorcontroltechniquehasobtainedtheconsiderabledevelopment,andalsoobtainedthewidespreadapplication.2VectorControlWithoutVelocityGeneratorTechniqueVectorcontrolwithoutvelocitygeneratortechniqueabolishtheproblemsthattheenvironmentcompatibility、installandmaintenancebringon,reducethecost,enhancethesystemreliability,atthesametime,unionvectorcontrol,hasthefineperformanceofvectorcontrol.Thespeedestimatemethodinvectorcontroltechniquewithoutvelocitygenerator,besidesbasismathematicalmodelcomputationelectricmotorrotationalspeed,atpresentthemoreappliedarethemodeltoreferautoadaptedmethodandexpandstheKalmanfilteringlaw.Inaddition,entireUygurrotormagneticfluxsight,toothovertoneelectricpotential,suchasthistheoryandsoon,alsoappearanceinthevectorcontrolwithoutvelocitygeneratortechnique.Since1983proposedthevectorcontrolwithoutvelocitygeneratortechniquecontrolstrategy,receivestheacademiccirclesandtheindustrialfieldcontinuouslyhighlyfocusedallthetime.HitachicompanyandSichuanelectricalmachineryandsoonhadpublishedtheresearchresultsseparatelyin1987,andhadpromotedtheproductoneafteranother.Atpresent,vectorcontrolwithoutvelocitygeneratortechniqueinfrequencyconvertercontrollinginthevelocitymodulationscopeisabout150,someindividualmerchanthas175orevenhigherproduct.3DirectTorqueControlTechniqueIn1985,GermanysM.Depenblockproposesthedirecttorquecontroltechnique(DTC)for

注意事项

本文(外文翻译--变频技术的普及前景.doc)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5