基于Maxwell的无线电能传输耦合机构的磁屏蔽分析-豆柴文库

您所在位置：网站首页 / 基于Maxwell的无线电能传输耦合机构的磁屏蔽分析.docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 2

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

基于Maxwell的无线电能传输耦合机构的磁屏蔽分析
Introduction
Wirelesspowertransfer(WPT)isapromisingtechnologyforprovidingpowertodeviceswithouttheneedforphysicalconnections.However,itposesachallengeduetothefactthatthepoweristransferredthroughmagneticfields,whichcaninterferewithsurroundingelectronicdevices.Toovercomethisissue,amagneticshieldingmechanismcanbeusedtoreducemagneticfieldinterferenceinWPT.ThispaperpresentsananalysisofamagneticshieldingmechanismforaWPTcouplingstructurebasedonMaxwell’sequations.
Maxwell’sEquations
Maxwell’sequationsdescribetherelationshipbetweenelectricandmagneticfieldsandthesourcesthatproducethem.Theequationscanbeusedtopredictthebehaviorofelectromagneticwavesandfieldsinavarietyofsituations.InthecaseofWPT,weareinterestedinthemagneticfieldgeneratedbythepowertransmitterandhowitinteractswiththereceivingdevice.TherearefourMaxwell’sequationsthatdescribetheelectromagneticfield:
1.curlE=-dB/dt
2.divB=0
3.curlH=J+dD/dt
4.divD=ρ
Here,Eistheelectricfield,Bisthemagneticfield,Histhemagneticfieldintensity,Jisthecurrentdensity,Distheelectricdisplacementfield,ρistheelectricchargedensity,andtistime.Theseequationsdescribethebehavioroftheelectromagneticfieldinspaceandtime.
WPTCouplingStructure
TheWPTcouplingstructureconsistsofatransmittercoilandareceivercoilthatareplacedinproximitytoeachother.ThetransmittercoilisdrivenbyanACpowersource,whichgeneratesamagneticfieldthatinducesanelectriccurrentinthereceivercoil.Theinducedcurrentinthereceivercoilisthenusedtopowerthedevice.
MagneticShieldingMechanism
Inordertoreducetheeffectsofelectromagneticinterferencefromthemagneticfieldgeneratedbythetransmittercoil,amagneticshieldingmechanismcanbeused.Themagneticshieldingmechanismconsistsofaferromagneticmaterialthatisplacedaroundthetransmittercoil.Theferromagneticmaterialactsasashield,whichabsorbsthemagneticfieldgeneratedbythetransmitterandpreventsitfrominterferingwithnearbyelectronicdevices.
MagneticShieldingAnalysis
TheeffectivenessofthemagneticshieldingmechanismcanbeanalyzedusingMaxwell’sequatio