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55PLCharcteristicRecived:30March204/Aceptd:5July204/Publishedonlie:30March205Springer-VerlagLondonLim ted205PLCEnglishfull tileProgram m ble LogicController,Chinesefulltileastheprogram m blelogicalcontroller,thedefinitionis:Onekindofdigitaloperationoperationselctronicsytem ,fordesignsspecialyintheindustryenvironmentapplication.Itusesakindofprogram m blem em ory,usesinitsinternalystoredprogram ,theactuatinglogicoperation,thesequentialcontrol,fixedtim e, countingandarithmeticoperationandsoonfaceusersinstruction,andthroughdigitaleithersim ulationtypeinput/outputcontroleachtypem achineryorproductionproces.1Reliabiltyishigh,antijammingabilty.Dependingonthenatureistheelctricontrolequipmentsesntialperform ance. BecausePLCusesthem odernlargescaleintegratedciruitechnology,usedthestricttechniqueofproductionm anufacture,theinternalciruithasadoptedtheadvancedantijam m ingtechnology,hadtheveryhighreliability.Forexam pletheMitsubishiCorporationproducesFserisPLm eantim ebetwenfailurereachesashighasfor300,000hours.SomeuseredundancyCPUPLCaveragetrouble-freoperatingtim eislonger.FromthePLCoutsidetheaircaftelctricircuit,usesthePLCconstiutioncontrolsytem ,compareswiththesam elevelscalefollowingtheelctricalpick-offsytem ,theelctricalwirngandtheswitchontactreducedtoseveralhundredsevenseveralthousands1,thebreakdownalsogreatlyreduces.Inaddition,PLChasthehardwarefaultself-m easuringability,presntswhenthebreakdownm aysendoutthearninginform ationpromptly.Intheapplicationsoftware,theapplicationm ayalsoenrolltheperipherycomponentsbreakdownfromthediagnosticprogram ,causesinthesytem alsoobtainsthebreakdown66besidesthePLCelctricircuitandtheequipm entfrom thediagnosiprotection.Thus,theoveralsytem hastheextrem lyhighreliabilityalsonottofelstrange.2Necsarycomplet,thefunctionisperfct,eserviceable.PLCdevelopstoday,hadalreadyform edthelarge,m ediumandsm aleachscalesrializedproduct.Mayuseineachscaletheindustrialcontrolsituation.Besidesthelogicalprocesingfunction,m odernPLCm ostlyhastheconsumm ationdataoperationability,m ayuseineachkindofnumericalcontroldomain.InrecntyearsthePLCfunctionunitem rgedm asively,causesPLCtosepthepositoncontrol,thetem peraturecontrol,CNandsooneachindustrialcontrol.InadditionthePLCtraficapacitysenhancem ntandthem an-m achinecontactsurfacetechnologysdevelopment,usesPLCtocomposeeachkindofcontrolsytembecomesveryeasy.3Easytostudyeasilytouse,thedepthiswelcometheengiersandtechnicans.PLCtakesthegeneralindustrialcontrolcomputer,isfacesIndustrialndm iningestablishmentslabortocontroltheequipment.Itsconnectioniseasy,theprogram m inglanguageaceptseasyfortheengineersandtechnicians.Thetrapezoidalchartlanguagesgraphicssym bolandtheturnofexpresionandtherelayciruitdiagram isquiteclose,onlyusesPLCthefewsitchquantitylogicalcontrolinstructiontobepossibletorealizetherelayelctricircuitsfunctionconveniently.Fornotthefam ilarelctronicciruit,didnotunderstandthecomputerprincipleandtheasem blylanguagepersonusesthecomputertobeengagedintheindustrialcontroltoopengateoftheconvenience.The4Systemsdesign,theconstructionworkloadaresmall,maintainconvenietly,easytotransfor.PLCreplacesthewirnglogicwiththestoredlogic,reducedthecontroldevicexteriorwirnggreatly,causescontrolsytem designandtheconstructioncyleisthereductiongreatly,sim ultaneouslym aintainsalsobecomeseasy.Causestheidenticalequipmentpossiblytobecomem oreim portantlyafterthealterprocedurechangeproductionproces.Thisverysuitablem ulti-varietis, sm al batchproductionsituation.The5Volumeismall,theweightislight,thenergyconsuptionislow.77TakesubminiaturePLCastheexam ple,recntlyproducedthevarietybasesizeism alerthan100mm , theweightism alerthan150g,thepowerlossonlycountsthetile.Becausethevolumesm alveryeasytoloadinthem achinery,realizestheintegrationofm achineryidealcontroldevice.Sincelong,PLCisintheindustrialutomationcontroldomainthroughoutthem ainbatlefild,hasprovidedtheveryreliablecontrolapplicationforvariousautomationcontroldevice.Itcanprovidesafereliableandthequiteperfectsolutionfortheautomatedcontrolapplication,suitsinthecurrentIndustrialentrprisetotheautomatedneed.Sincethe1980s,asresultofthecomputer technologyandm icroelectronictechnologysrapidlyexpand,theenorm ousim petusPLCdevelopment,thePLCfunctionwhichcausedstrengtheneddaybyday.IfPLCm aycaryonthesim ulationquantitycontrol,thepositoncontrolandthePIDcontrolandsoon,easytorealizetheflexiblem anufacturesytem . Thelong-distancecorrespondencefunctionrealizescausePLCevnm orepowerful.Atpresnt,intheadvancedcountries,PLChasbecometheindustrialcontrolthestandardequipment,hascoveredalIndustrialentrprisenearlyusingthesurface.PLCisonekindofsolidstaeelctronicinstaltion,itusestheprocedurewhichstorestocontrolm achinesm ovem entorthecraftworkingprocedure.PLCisusesfortosubstiutefortraditionaltheblack-whitecontrol,compareswithit,PLCism oreoutstandingthanitheperform ancetheblack-whitecontrollogic,thereliabilityispecialyhigh,thedesignconstructioncyleishort,thedebuggingrevise,m oreoverthevolumetobesm alconveniently,thepowerlossilow,theusem aintenanceisconvenient.Therefore,thisarticlehastudiedbasedontheprogram m blecontroller(PLC)elctricm otorsynthesim onitoringandprotectivesytem sm ethod.Makestheelctricm otorm ovem entthethre-phaseasynchronousm achine. Becausethethre-phaseasynchronousm otorrotorsrotationalspeedislowerthantherotaryfieldtherotationalspeed,therotorwindinghastherelativem otionwiththem agneticfield,buttheinducedem fandtheelctriccurrent,andhavetheelctromagnetism torquewiththem agneticfieldinteraction,realizestheenergyevolution.Compareswiththesingle-phaseasynchronousm otor,thethre-phaseasynchronousm otorperform ancecharacteristicisgood,andm aysaveeachm aterial.Thecrookedsubstructuresdifernce,thethre-phaseasynchronousm otorm aydivideintothe88cagetypeandwindthreadthetypetwokinds.Thecagetyperotorsasynchronousm otorstructureisim ple,them ovem entisreliable,theweightislight,thepricewascheap,obtainedthewidespreadapplication,itsm ajorobjectasthevelocitym odulationdificulty.Theregulatingrheostaresitancem ayim proveelctricm otorsstartingabilityandadjustelctricm otorsrotationalspeed.Thethre-phaseasynchronousm otorwilchangethevoltagenottochangetherotationalspeed,comm onlyusedchangesthenumberofpolepairs.Changesthethre-phasepowersourcesfrequency.Changesliding,abovetwocomm onvelocitym odulationm ethod.Thechangenumberofpolepairsneedstolookthatheelctricalm