机械本科专业毕业设计（论文）-外文翻译-异步电动机起动的方法和问题

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1、中国地质大学长城学院本科毕业论文外文资料翻译系别：工程技术系专业：机械设计制造及其自动化姓名：学号：年月日外文翻译AsynchronousMotorStartingMethodAndProblemsAbstract:Thelargecapacityofcommunicationasynchronousmotorhasavarietyofstartmethod.Choiceofsuchastotalpressureofthepressuredropandstartstart-up,autoformertransformerstart,startriangleconversi

2、onstart,softstart,orusingspeeddriveshavepotentialadvantageandchoice.Step-downstartcanreducestarttorque,canpreventdamagetotheload.Inaddition,thepowerfactorcorrectioncapacitorcanbeusedtoreduceelectricitybutchoosemodelmustbeappropriate,orwillcauseseriousdamageofcapacitor.Chooseasuitableforam

3、otorstartupmethod,needanalysispowersystemsandstartloadtoensurethatmeettheperformanceandcostmotoratleast.Thispaperwilldiscussthemostcommonseveralstartmethodandtheirapplication.keywords:Motorstartup,step-downstart,Autoformertransformer,Startriangle,Powerfactorcorrection.1.IntroductionTherea

4、reavarietyofasynchronousmotorstartupmethodtotalpressureofthestart,step-downstart,startriangleconversionstartandpartofthewindingtypeetc.Step-downstartincludingsolidstarter,frequencyconversionstartandselfcouplingtransformerstart.Thesealongwithallthepressureordirectstart,whenmotorapplicatio

5、nsisdeterminedtogivethebuyerafteratypeofchange.Eachmethodhasitsownadvantages,andtradeperformance.Thereasonablechoiceofelectricpowersystemincludingthoroughstudyoftheaccelerationoftheloadandthefullcostofequipment.Inordertomaketheloadcanbegoodacceleration,motormustproduceloaddemandmorethanth

6、etorque.GeneraltoSaid,inthemechanicalcharacteristiccurvefocusonthefollowingthreeareas.ThefirstpointisstuckaroundmomentLRTandmakemotorrotatebystatictotheminimumtorque.Thesecondistheminimumstarttorqueandmakemotorfromthestaticacceleratedtoappearbrakingtorqueyestheminimumtorque.Thelastpointis

7、astreettorque,isthelargestmotorcanproducetorque.Ifanysectionofthedottedlineintheloadcurve,themotorcan'tstart.Motor'saccelerationtimebyinertiaandtheloadisthemotortorque-speedcharacteristiccurveandloadcharacteristicscurveofthedifferencebetweenthedecision.Ingeneral,the