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AnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanceMotor5.3-120SwitchedReluctanceMotorThisexampleisintendedtoshowyouhowtocreateandanalyzeamagnetostaticproblemwithstrandedconductorsonaSwitchedReluctanceMotorgeometryusingMagnetostaticsolverintheAnsoftMaxwell3DDesignEnvironment.WithintheMaxwell3DDesignEnvironment,solidcoilscanbemodeledasStrandedConductors.TherearemanyadvantagestousingStrandedConductorswhenmodelingcoilsthathavemultipleturns.Thefirstobviousadvantageisthatacoilwithmultiplewires,say2500,canbemodeledasasingleobjectasopposedtomodelingeachwirewhichwouldbeimpracticable.DefiningaStrandedConductormeansthatthecurrentdensitywillbeuniformthroughoutthecrosssectionoftheconductor.TheexamplethatwillbeusedtodemonstratehowStrandedConductorsareimplementedinaswitchedReluctanceMotor.Thisswitchedreluctancemotorwillhavefourphasesandtwocoilsperphase..EddyCurrentSolver:ThereisnofundamentaldifferencebetweenhowstrandedconductorsaretreatedintheEddyCurrentsolverascomparedtotheMagnetostaticSolver.WhenusingtheEddyCurrentSolverandspecifyingStrandedfortheterminalexcitationtheEddyEffectisautomaticallyturnedoff.TransientSolver:SeeExample7.1forsetupinstructionsforthisdesign.AnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanceMotor5.3-121Theory–MagnetostaticSolverWhenusingtheMagnetostaticSolver,withaStrandedCurrentSource,thesolverassumesthefollowingconditions:1.Thecurrentdensityisuniformlydistributedoverthecrosssectionoftheterminal2.Thedirectionofthecurrentisindicatedbythearrowasseenontheterminal.ChangethedirectionofthecurrentbyclickingonSwapDirectionintheCurrentExcitationwindowtoreversetheflow.3.Thesolverdoesnotknowhowmanyturnsarerepresentedbythecoil,thusthevalueofcurrentthatisbeingappliedrepresentsthetotalampere-turns.Forthisexample,thevalue3570couldrepresentanyofthefollowing:1.25ampsat150turns2.5ampsat750turns3.15ampsat250turnsoranysuchcombinationthatproducesavalueof3750ampere-turns.Therationofamptoturnsdoesnotimpactthemagnetics,althoughitdoesimpacttheinductance.Pleaserefertotheoverviewfordetailsoftheinductancecalculation.AnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanceMotor5.3-122Theory–MagnetostaticSolver(Continued)Theampere-turnvalueusedtodefinethecurrentsourceisusedtocalculatethecurrentdensitywhichistheinitialconditionusedbythesolveraccordingtotheequation:Where:Iisthetotalcurrentinampere-turnsSistheareaoftheterminalinm2istheunitnormaldirectionistheCurrentDensityvectorinA/m2Thepathofthecurrentisdeterminedbytheconductionpath.SelectthemenuitemMaxwellExcitationsConductionPathstoviewtheconductionpath,andverifythattheconductionpathiscorrect.Inthisexample,ifanyofthecoilstouchedthestator,thenthiswouldconstituteaseparateconductionpathsincethematerialpropertiesofthestatorhasaconductivityvalue2e6siemens/meter;tosolvethisproblemaninsulationboundarywillneedtobeappliedtothecoilsorstator;pleaserefertotheoverviewsectionfordetailsoninsulationboundaries.AlthoughtheMagnetostaticsolverusesthecurrentdensityvectorJastheinitialcondition,itdoesnotsolveforJdirectlyaspartoftheoutputsolutionmatrix.ThequantitythattheMagnetostaticsolverdirectlycalculatesisthemagneticfieldintensityH.FromH,thecurrentdensityJinanyconductorisderivedby:HJ×∇=∧=nSIJ∧nJAnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanceMotor5.3-123AnsoftMaxwellDesignEnvironmentThefollowingfeaturesoftheAnsoftMaxwellDesignEnvironmentareusedtocreatethemodelscoveredinthistopic3DSolidModelingUserDefinedPrimitives(UDP):SwitchedReluctanceMotorPrimitives:RegularPolyhedronSurfaceOperations:SectionBooleanOperations:SeparateBodiesBoundaries/ExcitationsCurrent:StrandedAnalysisMagnetostaticResultsFieldCalculatorFieldOverlays:MagnitudeBAnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanceMotor5.3-124GettingStartedLaunchingMaxwell1.ToaccessMaxwell,clicktheMicrosoftStartbutton,selectPrograms,andselectAnsoftandthenMaxwell11.SettingToolOptionsTosetthetooloptions:Note:Inordertofollowthestepsoutlinedinthisexample,verifythatthefollowingtooloptionsareset:1.SelectthemenuitemToolsOptionsMaxwellOptions2.MaxwellOptionsWindow:1.ClicktheGeneralOptionstabUseWizardsfordataentrywhencreatingnewboundaries:;CheckedDuplicateboundarieswithgeometry:;Checked2.ClicktheOKbutton3.SelectthemenuitemToolsOptions3DModelerOptions.4.3DModelerOptionsWindow:1.ClicktheOperationtabAutomaticallycoverclosedpolylines:;Checked2.ClicktheDrawingtabEditpropertyofnewprimitives:;Checked3.ClicktheOKbuttonAnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanceMotor5.3-125OpeningaNewProjectToopenanewproject:InanAnsoftMaxwellwindow,clicktheOntheStandardtoolbar,orselectthemenuitemFileNew.FromtheProjectmenu,selectInsertMaxwellDesign.SetSolutionTypeTosetthesolutiontype:SelectthemenuitemMaxwellSolutionTypeSolutionTypeWindow:ChooseMagnetostaticClicktheOKbuttonAnsoftMaxwell3DFieldSimulatorv11User’sGuide5.3Example(Magnetostatic)–SwitchedReluctanc