A Capacitor-Run Single-Phase Induction Motor Probl

AnsoftRMxprtApplicationNoteApplicationNoteAP066-9911ACapacitor-RunSingle-PhaseInductionMotorProblemThisapplicationnotedescribeshowtosetup,solve,andanalyzetheresultsofasix-pole,capacitor-runsingle-phaseinductionmotorusingRMxprt.Oncesolved,theresultsfromRMxprtwillbeusedasabasisforperformingmoredetailedanalysesinthefiniteelementtimetransientsolver,EMpulse.RMxprtusesacombinationofelectricandmagneticcircuitequationstopredicttheperformanceofthissinglephaseinductionmotor.EMpulseisanonlineartime-domainfiniteelementanalysis(FEA)softwarepackagethatsolveselectromagneticfieldequations,electriccircuitequations,andequationsofmotion.YoucancreatethisprojectfromscratchorviewitbyopeningtheRMxprtprojectnamed1ph.pjtandthefiniteelementprojectnamed1ph_fea.pjt.TheRMxprtprojectisinthe/ansoft/examples/rmxprt/directory,andhefiniteelementprojectcanbedownloadedfromtheAnsoftWebSiteatfinetheGeneralDataUsetheGeneral1windowtodefinegeneralmotorcharacteristics,suchasoutputpower,voltage,numberofpoles,andfrequencyofthemotor.➤Definethegeneraldata:1.ChooseTools/Optionsfromthemenubar,andmakecertaintheWireSettingisAmerican(AWG).ChooseOKtoacceptthewiregaugesetting.2.Enter0.268kWintheRatedOutputPowerfield.3.Enter115voltsinthedrivingRMSRatedVoltagefield.4.Enter6intheNumberofPolesfield.5.Enter60HzintheFrequencyfield.6.Enter1013rpmintheRatedSpeedfield.7.Enter5.4wattsintheFrictionLossfield.Frictionandwindlossesaretypicallyassumedtobetwotothreepercentoftheratedoutputpower.Forthisexample,use2%or5.4watts.8.Enter43.688mmintheIronCoreLengthfield.Theironcoreisthestator.9.Enter0.95astheStackingFactor.Thisgivesavalueof41.504mmasthenetlengthofthesteel,aftertakinglaminationintoaccount.10.SelectM22_24GintheSteelTypefieldtospecifythenonlinearsteeltypeusedinmanufacturingtherotorandstatorlamination.ToviewtheBH-curveforthismaterial,chooseMaterials/BH,thenchooseOpenfromtheMaterialDatawindow.SelectM22_24G.h-basthefiletoopen.Oncethedataisloadedintheleft-handwindow,youcanplottheBH-curveforthismaterial.Thestandardlossandspecificweightofthematerialarealsodisplayed.Thisinformationisnecessarytocalculatetheironcoreloss.ChooseExittoexittheMaterialDatawindowandcontinuethegeneraldatainput.11.Leave75intheOperatingTemperaturefield.12.SelectConstantPowerastheLoadType.13.SelectInnerastheRotorPosition.ACapacitor-RunSinglePhaseInductionMotorProblemPage3DefinetheOperationModesUsetheGeneral2windowtodefinetheoperationmodesofthemotor.➤Definetheoperationmodes:1.SelectC-RunastheOperationMode.Thesupportedoperationmodesare:2.Enter0intheRunCapacitanceandResistancefieldsfortheauto-designofthecapacitors.InCapacitorRunmode,thecapacitorisdesignedtominimizethebackwardmagnetomotiveforce.Theresistanceisunknown.RMxprtevaluatesthevalueoftheresistancebasedonalosstangentof0.01.3.SelectNoneastheSpeed-AdjustMode.Inthisexample,themotorisacapacitorrun(C-Run)typewithnospeedadjustment.Becausethereisnoadjustment,theAdj.WindingTurnRatioisinactiveandsettozerobydefault.C-RunCapacitorRunmode.Acapacitorisconnectedinserieswiththeauxiliarywinding.C-StartCapacitorStartmode.Theauxiliarywindingconnectedinserieswithacapacitorisdisconnectedaftertherotorreaches20%ofthesynchronousspeed.C-R&SCapacitorRunandStartmode.Twocapacitorsareusedinserieswiththeauxiliarywinding,oneforstartingandoneforrunning.R-StartResistanceStartmode.Theauxiliarywindingisdisconnectedafterthemotorhasstarted.Page4ACapacitor-RunSinglePhaseInductionMotorProblemStatorDataUsetheStator1andStator2windowstodefinethestatordimensionsandwindings.DefinetheDimensionsUsetheStator1windowtodefinethestatordimensions.➤Definethestator:1.Enter82.575mmintheInnerDiameterfield.2.Enter139.192mmintheOuterDiameterfield.3.Enter24intheNumberofSlotsfield.4.Select2astheSlotTypefortheshapeoftheslot.5.MakecertainthatAutoDesignisdeselected.6.EnterthefollowingdimensionsintheBigslotcolumn:•Enter0.7112intheHs0field.•Enter0.5588intheHs1field.•Enter13.97intheHs2field.•Enter2.3876intheBs0field.•Enter5.6896intheBs1field.•Enter9.5504intheBs2field.DefinetheWindingsUsetheStator2windowtodefinethestatorwindings.➤Definethewindings:1.SelecttheStator2tab.2.Enter0.254mmintheSlotInsulationfield.Thisvalueisthethicknessononesideofthestatorslot.3.Enter0intheEndAdjustmentfield.Thisvalueisusedasthelengththatthestatorwindingsextendfromtheendofthestator.ACapacitor-RunSinglePhaseInductionMotorProblemPage54.SelectTopastheMainCoilPosition.Themaincoilisplacedinthetopoftheslot,andtheauxiliarycoilinthebottom.5.Select32astheWindingType.Thewindingisasecond-classconcentricwinding.6.RMxprtcanoptionallycalculatetheoptimumwindingarrangement,includingthenumberofwiresperconductor,thewirediameterandthenumberofconductorspereachslot.Ifyouwantthis,youcanselectAutoDesign.Forthisexample,makecertainthatAutoDesignisdeselected.7.E