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1、基于PLC控制的异步电动机软起动器的应用?PLCcontrolledasynchronousmotorsoftstarterapplicationsChuan-weili?(weihaivocationalcollege,26,4210)Abstract:thearticleintroducestheworkingprincipleofsoftstarter,operationmode,operationcharacteristicsandcontrolmethods,andintroducedthe
2、PLCapplicationintheacmotorsoftstartKeywords:asynchronousmotor;Softstarter.Motorstartingproperty;PLCcontrolMiddleimageclassificationnumber:TM571.6+1;TheTM343.+2?Documentidentificationcode:B?Articlenumber:1004-0420(2008)06-0055-030?TheintroductionInthesta
3、rt-upcontrolofacasynchronousmotor,theusualfull-pressureisdirectlyinitiatedBoththemotionandthedecompressionstartintwoways,asthetraditionalwayofpriming.ButintheInsomecaseswheretherearespecialrequirements,thesetraditionalmethodsofpriminghavenoeffectLessdis
4、advantages.Inrecentyears,duetothedevelopmentoffrequencyconversionandsoftstart-uptechnology,thesolutionhasbeensolvedSomeproblemsexistinthecontrolofelectricmotor,especiallythesoftstart-uptechnologyTheabilitytosolvetheproblemoflargeandmediumcapacityisexcel
5、lentAnewtechniquefordecompression.1?Traditionalstartupmethodsandtheirdefects1.1?ThedrawbacksoftraditionalstartupmethodsA:startupashighas5~7timesthestartingcurrent,causingthemotorwindingOverheatingcauseshightemperaturesandspeedsupinsulation.B.Thevoltaged
6、ropinthenetworkvoltage?At85UnThenormaluseofotherdevices,especiallyunder-voltageprotection;C.startwithenergylossandwasteenergy,especiallyifitisfrequentAtthestart;D.TheequipmentthatisbeingdrivenhasagreatimpactontheequipmentLifeexpectancy,impactaccuracy;E.
7、CauseabnormalwearandtearofmechanicaltransmissionpartsReducedlifespan;Thefailurerateofcontrolequipmentsuchas.fcontactorishigher.1.2?RestrictionsonthetraditionalstartmodeWhetherthemachinewillallowthemotortostartdirectlyisaprerequisiteA;Whenstartingdirectl
8、y,thecapacityofthemotorisnotallowedtobegreaterthan10%15%maintransformercapacity;Thevoltagedropinthestartprocessisnotgreaterthan15%Un.Inthepast,theproblemofstart-upofhighpowerelectricmotorswasadoptedSometraditionalstart-upmethodsa
