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1、ANSYS2011中国用户大会优秀论文DesignandStudyofaNovelLinearMotorforStirlingCryocoolerWenpengZheng,ZhouZhang,WeiSuNo.21ResearchInstituteunderChinaElectronicsTechnologyCompany,ChinaE-mail:zwp-2000@163.comDigest:BasedontheanalysisofthetwoexistingtypicallinearmotorsforStirlingCryocoolers,anovelstructureli
2、nearmotorisdeveloped,whichadoptsassembledstatorcoreandhasthecharacteristicsofhighairgapfluxdensity,smallvolume,lightweightandsimpleinstallation.Firstly,thesizeestimationformulaisestablishedinthispaper,andthenthemotorparametersareoptimizedwiththefiniteelementmethod(FEM)consideringtheeffecto
3、fchangingitsstructuresize.Analyticalresultsshowthatthenovelstructurecansignificantlyreducethevolume,whichisspeciallyimportantforthespaceflightapplication.Theexperimentverifiesthefeasibilityandcalculationaccuracyofthedesign.Keywords:linearmotor,stirlingcryocooler,magnet-moving1.INTRODUCTION
4、ComparedwithrotationStirlingCryocoolers,linearStirlingCryocoolersarecharacterizedwithsmallvolume,highefficiencyandlonglife,makingthemmoreutilized.ThelinearStirlingCryocoolerisdirectlydrivenbyalinearmotorandthetwoisassembledinoneunit;therefore，themotorbehaviorhasaveryimportanteffectontheCry
5、ocooler.AdvancedlinearStirlingCryocoolersmostlyadoptmagnet-movinglinearmotors(MMLMs),inwhichthemagnetmoveswhilethewindingkeepsstill.Thistypeofmotorisoflonglifeandhighreliability,makingitsuitableforthespaceapplication.MMLMscanbeclassifiedintotwotopologiesintermsofthestatorcore:theonewithtoo
6、thandthatwithouttooth.TheMMLMwithouttooth,showninFig.1,[1]iscomposedofstatorandmover,andthestatorincludescoilandyokewhilethemovercontainsmagnetandinnerironcore.Theconstructionhasthemeritofsimplestructureandeasyinstallation.However,itslowfluxdensityduetoitslargeactivegaplengthleadstoalowpow
7、erdensity.MostThalesproductsareofthisstructure.Literature[2]proposesanMMLMwithtooth,showninFig.2,whichisalsocomposedofstatorandmover.Thestatorenvelopscoil,outerstatorcoreandinnerstatorcorewhilethemoverincludesmagnet.Itssmalleffectiveairgaphelpsachievehighairga
