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ID:8464047
大小:952.52 KB
页数:19页
时间:2018-03-28
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1、附录Ⅰ:MagnetoelasticTorqueSensorUtilizingaThermalSprayedSense-ElementforAutomotiveTransmissionApplicationsBrianD.KilmartinSiemensVDOAutomotiveCorporationABSTRACTAMagnetoelasticbasedNon-Contacting,Non-CompliantTorqueSensorisbeingdevelopedbySiemensVDOforautomotivetransmissionapplic
2、ations.Suchasensorwouldbenefittheautomotiveindustrybyprovidingthefeedbackneededforprecisecomputercontroloftransmissiongearshiftingunderawiderangeofroadconditionsandwouldalsofacilitatecross-platformusageofacommontransmissionunit.SiemensVDOhasprototypedtransmissiontorquesensorsop
3、eratingontheprincipleofInverse-magnetostriction,alsoreferredtoastheInverse-JouleEffectandtheVillariEffect.Magnetostriction,firstdocumentedinthemid1800’s,isastructuralpropertyofmatterthatdefinesamaterial’sdimensionalchangesasaresultofexposuretoamagneticfield.Magnetostrictionisca
4、usedwhentheatomsthatconstituteamaterialreorientinordertoaligntheirmagneticmomentswithanexternalmagneticfield.Thiseffectisquantifiedforaspecificmaterialbyitssaturationmagnetostrictionconstant,whichisavaluethatdescribesamaterial’smaximumchangeinlengthperunitlength.Inverse-magneto
5、striction,conversely,defineschangesinamaterial’smagneticpropertiesinresponsetoappliedmechanicalforces.Materialthatishighlymagnetostrictiveandelasticinnatureisreferredtoasbeingmagnetoelastic.ThepremiseoftheSiemensVDOtorquesensordesignisthatamagnetoelasticmaterialcanbebondedtoacy
6、lindricalshaftandmagnetizedinitsmechanicalquiescentstatetocreateasense-element.Whileundertorque,principletensileandcompressivestressvectorsintheformofcounter-spiraling,mutuallyorthogonalhelicesdevelopintheshaftandareconveyedtothemagnetoelasticsense-elementgivingrisetoameasurabl
7、emagneticfieldchange.Themagneticfielddeviationthatarisesfromthemagnetoelasticsense-elementisdirectlyproportionaltothemagnitudeoftheimposedtorque.Ineffect,themagneticfieldismodulatedbytorque.Asensitivemagnetometerthentranslatesthefieldstrengthintoananalogvoltagesignal,therebycom
8、pletingthetorque-to-voltagetransducerfunction.Critical
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