基于plc的异步电动机监控系统的设计及应用-毕业论文外文翻译

1、翻译部分英文原文DesignImplementationofPLCBasedMonitingControlSystemfInductionMotMariaG.IoannidesSeniMemberIEEEAbstract—Theimplementationofamonitingcontrolsystemftheinductionmotbasedonprogrammablelogiccontroller(PLC)technologyisd

2、escribed.Alsotheimplementationofthehardwaresoftwarefspeedcontrolprotectionwiththeresultsobtainedfromtestsoninductionmotperfmanceisprovided.ThePLCcrelatestheoperationalparameterstothespeedrequestedbytheusermonitsthesystem

3、duringnmaloperationundertripconditions.TestsoftheinductionmotsystemdrivenbyinvertercontrolledbyPLCproveahigheraccuracyinspeedregulationascomparedtoaconventionalVfcontrolsystem.TheefficiencyofPLCcontrolisincreasedathighsp

4、eedsupto95%ofthesynchronousspeed.ThusPLCprovesthemselvesasaveryversatileeffectivetoolinindustrialcontrolofelectricdrives.IndexTerms—Computercontrolledsystemscomputerizedmonitingelectricdrivesinductionmotsmotioncontrolpro

5、grammablelogiccontrollers(PLCs)variablefrequencydrivesvoltagecontrol.I.INTRODUCTIONSincetechnologyfmotioncontrolofelectricdrivesbecameavailabletheuseofprogrammablelogiccontrollers(PLCs)withpowerelectronicsinelectricmachi

6、nesapplicationshasbeenintroducedinthemanufacturingautomation[1][2].Thisuseoffersadvantagessuchaslowervoltagewhenturnedontheabilitytocontrolmotsotherequipmentwithavirtuallyunitypowerfact[3].ManyfactiesusePLCsinautomationp

7、rocessestodiminishproductioncosttoincreasequalityreliability[4]–[9].Otherapplicationsincludemachinetoolswithimprovedprecisioncomputerizednumericalcontrol(CNC)duetotheuseofPLCs[10].Toobtainaccurateindustrialelectricdrives

8、ystemsitisnecessarytousePLCsinterfacedwithpowerconverterspersonalcomputersotherelectricequipment[11]–[13].Neverthelessthismakestheequipmentmesophisticatedcomplexexpensive[14][15].Fewpaperswerepublishedconcerningdcmachine

9、scontrolledbyPLCs.TheyreptboththeimplementationofthefuzzymethodfspeedcontrolofadcprogramisenteredintothePLCmemy.Inourapplicationitcontrolsthroughanalogdigitalinputsoutputsthevaryingloadconstantspeedoperationofaninduction

10、mot.AlsothePLCcontinuouslymonitstheinputsactivatestheoutputsaccdingtothecontrolprogram.ThisPLCsystemisofmodulartypecomposedofspecifichardwarebuildingblocks(modules)whichplugdirectlyintoaproprietarybus:acentralprocessunit

11、(CPU)apowersupplyunitinputoutputmodulesIOaprogramterminal.Suchamodularapproachhastheadvantagethattheinitialconfigurationcanbeexpedfotherfutureapplicationssuchasmultimachinesystemscomputerlinking.III.CONTROLSYSTEMOFINDUCT

12、IONMOTInFig.2theblockdiagramoftheexperimentalsystemisillustrated.Thefollowingconfigurationscanbeobtainedfromthissetup.a)Aclosedloopcontrolsystemfconstantspeedoperationconfiguredwithspeedfeedbackloadcurrentfeedback.Theind

13、uctionmotdrivesavariableloadisfedbyaninverterthePLCcontrolstheinverterVFoutput.b)Anopenloopcontrolsystemfvariablespeedoperation.TheinductionmotdrivesavariableloadisfedbyaninverterinconstantVFcontrolmode.ThePLCisinactivat