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1、FiniteElementModelofaMagnetDrivenReedSwitchBryanM.LaBarge1andDr.ErnestoGutierrez-Miravete21GemsSensorsandControls,2RensselaeratHartfordScopeUseCOMSOLtopredictandvisualizeamagneticfieldUsefurtherprocessingtodeterminefieldstrengthCorrelatefieldstrengthtoreedswitchoperationBackgroundMagnet/reedswitchs
2、ystemsareusedextensivelyforproximitysensingAbilitytopredictreedswitchoperationreducestestingtime,timetomarketKnowingmagnetstrengthatanypointallowsdesignertofocusonreedswitchselectionWhatisareedswitch?GoverningEquationsMaxwell’sEquationsMagnetizationEquationB=m(H+M)ApplicationDescriptionModelCreatio
3、n2-D(r-zcoordinate)magneto-staticanalysisMagnetcenterlineboundsmodelMagnetmodeledasiron,boundedbyairM=1.6x105A/mRelativepermeability(m)=4000Elements:15,472(triangular,7859nodes)Static,stationarysolverOutput=Gauss(r-,z-,normaldirection)ModelValidationMagnetmountedtoXYtable,Gaussprobestationary,3.9mm
4、paralleltomagnetcenterlineMeasurementstakenevery0.3mmResultsplottedvs.COMSOLoutputProcedure(inbrief)ExportCOMSOLdatatoEXCELUseEXCELdataaslook-uptableCalculatecoordinatesofswitchmovementalonganarcCalculatemagneticfieldatcoordinatesusinglook-uptableDetermineswitchoperationProcedure(continued…)COMSOLd
5、ataexportedtoEXCEL0.3mmresolutionin(x,y)coordinatesMagnet/Switchlocationmeasuredrelativetopivotpoint(origin)Open/closedpositionsofswitchmeasuredforlaterreferenceProcedure(continued…)xmaxdefinesarcradiusCoordinatescalculatedon0.02mmresolutioninx-directionCoordinatesareinterpolatedfromthelook-uptable
6、toassignGaussvaluestopointsonthearcArccoordinates/Gaussvaluesbecomesecondlook-uptableResultsReedswitchesaretestedusingatestcoil,measuringoperationintermsofAmpere-Turns(AT)AT=InI=current;n=numberofcoilturnsTestswitchopen/closedvalues:Open=29.1ATClosed=18.7ATResults(continued…)Priorempiricaltestingsh
7、owsGauss/ATcorrelationG=0.533AT–0.857Open=14.7GClosed=9.12GResults(continued…)ModelVerificationRed=COMSOL,Blue=EmpiricalResults(continued…)COMSOLcontourplot,normaldirectionResults(continued…)COMSOLcontourpl
