新康达磁芯及术语及定义

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1、术语及定义Terms&Definitions 1.起始磁导率 Initialpermeability,μi起始磁导率是磁性材料的磁导率(B/H)在磁化曲线初始区的极限值，即ThisisthelimitvalueofB/HwhereHisindefinitelyclosetozeroattheinitialmagnetizationcurveofaferromagneticsubstance.                            式中Where：μ0为真空磁导率permeabilityinvacuum(4π×10-

2、7H/m)H为磁场强度 magneticfieldstrength(A/m)B为磁通密度magneticfluxdensity(T)2. 有效磁导率 Effectivepermeability,μe为了便于绕线，在变压器和电感器中常用两只磁心配对构成闭合磁路。由于磁路各部分形状尺寸不同，且配合面又残存气隙(为改善性能，有时在磁路中开制气隙)，因此要用有效磁导率代替起始磁导率来表示磁心的性能。在闭合磁路中Thisisusuallydefinedastheeffectivepermeabilityofacoreformingaclos

3、edcircuitwhereleakagefluxisnegligiblysmall.                           式中Where：L为装有磁心的线圈的电感量self-inductanceofcoilwithcore(H)N为线圈匝数numberofcoilturnsLe为磁心有效磁路长度 effectivemagneticpathlengthofcore(m)Ae为磁心有效截面积effectivecross-sectionalareaofcore(m2)3. 饱和磁通密度 Saturationfluxde

4、nsity,Bs(T)材料磁化到饱和状态的磁通密度。见图1Saturationfluxdensityisthemaximumattainablefluxdensitywhenaveryhighmagneticfieldisappliedtoasoftmagneticmaterial,asshowninFig.14. 剩余磁通密度 Residualmagneticfluxdensity,Br(T)从饱和状态去除磁化场后，剩余的磁通密度。见图1Thisistheamountofresidualmagneticfluxdensityre

5、tainedbythecoreafterthemagneticfieldisweakenedandfinallyremoved,asshowninFig1.5. 矫顽力 Coercivity,Hc(A/m)从饱和状态去除磁场后，磁心继续被反向的磁场磁化，直至磁通密度减为零，此时的磁场强度称为矫顽力。见图1Thisisthestrengthofthemagneticfieldwherebytheresidualfluxdensitybecomeszeroundertheintensificationintheoppositedire

6、ctionofthemagneticfield,asshowninFig1.6. 损耗因数 Lossfactor,tanδ损耗因数是磁滞损耗、涡流损耗和剩余损耗三者之和：Thelossfactorcanbe splitup intothreeparts:tanδ=tanδh+tanδe+tanδr式中Where： tanδh为磁滞损耗hysteresislossTanδe为涡流损耗eddy-currentlossTanδr为剩余损耗residualloss7. 相对损耗因数 Relativelossfactor,tanδ/μ相对损

7、耗因数是损耗因数与磁导率之比。tanδ/μi适用于材料；tanδ/μe适用于磁路中含有气隙的磁心。Thisistheamountoflossperunitpermeabilityandisexpressedasfollows:tanδ/μi(formagneticmaterial)                      tanδ/μe(wheregapsareaddedtothemagneticcircuit)8. 磁滞常数 Hysteresismaterialconstant,ηB (10-6/mT)磁滞常数表征材料在磁通密

8、度增加时磁滞损耗的变化Hysteresismaterialconstantcharacterizesthechangeofthehysteresislossofthematerialwhenthefluxdensityisincreased.