外文翻译基于PLC异步电动机运行监控系统设计与实施论文.docx
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外文翻译基于PLC异步电动机运行监控系统设计与实施论文.docx
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外文翻译基于PLC异步电动机运行监控系统设计与实施论文
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DesignandImplementationofPLC-BasedMonitoringControlSystemforInductionMotor
ZHUShao-ying,XUYu,HeZheng-wen
XianJiaotongUniversity,Xian710049,P.R.China
Abstract:
Theimplementationofamonitoringandcontrolsystemfortheinductionmotorbasedonprogrammablelogiccontroller(PLC)technologyisdescribed.Also,theimplementationofthewiththeresultsobtainedfromtestsoninductionmotorperformanceisprovided.ThePLCcorrelatestheoperationalparameterstothespeedrequestedbytheuserandmonitorsthesystemduringnormaloperationandundertripconditions.TestsoftheinductionmotorsystemdrivenbyinverterandcontrolledbyPLCproveaspeedregulationascomparedtoaconventionalcontrolsystem.TheefficiencyofPLCcontrolisincreasedatindustrialcontrolofelectricdrives.
Keywords:
Computer-controlledsystems,computerizedmonitoring,electricdrives,inductionmotors,motioncontrol,programmablelogiccontrollers(PLCs),variable-frequencydrives,voltagecontrol.
I.INTRODUCTION
Sincetechnologyformotioncontrolofelectricdrivesbecameavailable,theuseofprogrammablelogiccontrollers(PLCs)withpowerelectronicsinelectricmachinesapplicationsintroducedinthemanufacturingautomation[1],[2].Thisuseoffersadvantagessuchaslowervoltagedropwhenturnedonandtheabilitytocontrolmotorsandotherequipmentwithavirtuallyunitypowerfactor[3].ManyfactoriesusePLCsinautomationprocessestodiminishproductioncostandtoincreasequalityandreliability[4]–[9].Otherapplicationsincludemachinetoolswithimprovedprecisioncomputerizednumericalcontrol(CNC)duetotheuseofPLCs[10].Toobtainaccurateindustrialelectricdrivesystems,itisnecessarytousePLCsinterfacedwithpowerconverters,personalcomputers,andotherelectricequipment[11]–[13].Nevertheless,thismakestheequipmentmoresophisticated,complex,andexpensive[14],[15].
FewpaperswerepublishedconcerningdcmachinescontrolledbyPLCs.TheyreportboththeimplementationofthefuzzymethodforspeedcontrolofadcmotorgeneratorsetusingaPLCtochangethearmaturevoltage[16],andtheincorporationofanadaptivecontrollerbasedontheself-tuningregulatortechnologyintoanexistingindustrialPLC[17].Also,othertypesofmachineswereinterfacedwithPLCs.Thereby,anindustrialPLCwasusedforcontrollingsteppermotorsinafive-axisrotorposition,directionandspeed,reducingthenumberofcircuitcomponents,loweringthecost,andenhancingreliability[18].Forswitchedreluctancemotorsasapossiblealternativetoadjustablespeedacanddcdrives,asinglechiplogiccontrollerforcontrollingtorqueandspeedusesaPLCtoimplementthedigitallogiccoupledwithapowercontroller[19].OtherreportedapplicationconcernsalinearinductionmotorforpassengerelevatorswithaPLCachievingthecontrolofthedrivesystemandthedataacquisition[20].Tomonitorpowerqualityandidentifythedisturbancesthatdisruptproductionofanelectricplant,twoPLCswereusedtodeterminethesensitivityoftheequipment[21].
II.PLCASSYSTEMCONTROLLER
APLCisamicroprocessor-basedcontrolsystem,designedforautomationprocessesinindustrialenvironments.Itusesaprogrammablememoryfortheinternalstorageofuser-orientatedinstructionsforimplementingspecificfunctionssuchasarithmetic,counting,logic,sequencing,andtiming[23],[24].APLCcanbeprogrammedtosense,activate,andcontrolindustrialequipmentand,therefore,incorporatesanumberofIOpoints,whichallowelectricalsignalstobeinterfaced.InputdevicesandoutputdevicesoftheprocessareconnectedtothePLCandthecontrolprogramisenteredintothePLCmemory(Fig.1).
Fig.1.ControlactionofaPLC.
III.CONTROLSYSTEMOFINDUCTIONMOTOR
InFig.2,theblockdiagramoftheexperimentalsystemisillustrated.Thefollowingconfigurationscanbeobtainedfromthissetup.
a)Aclosed-loopcontrolsystemforconstantspeedoperation,configuredwithspeedfeedbackandloadcurrentfeedback.Theinductionmotordrivesavariableload,isfedbyaninverter,andthePLCcontrolstheinverterVfoutput.
b)Anopen-loopcontrolsystemforvariablespeedoperation.TheinductionmotordrivesavariableloadandisfedbyaninverterinconstantVfcontrolmode.
c)Thestandardvariablespeedoperation.Theinductionmotordrivesavariableloadandisfedbyaconstantvoltage-constantfrequencystandardthree-phasesupply
Theopen-loopconfigurationb)canbeobtainedfromtheclosed-loopconfigurationa)byremovingthespeedandloadfeedback.Ontheotherc)resultsiftheentirecontrolsystemisbypassed.
IV.HARDWAREDESCRIPTION
Thecontrolsystemisimplementedandtestedforawoundrotorinductionmotor,inTableI.Theinductionmotordrivesadcg
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