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1、本科毕业论文（20届）抽拉式电磁铁电磁力的有限元分析27摘 要摘要:本文概述了电磁场基本理论及用有限元法计算电磁力。根据抽拉式电磁铁的具体实样，建立一个ANSYS有限元的分析模型进行仿真模拟。利用ANSYS软件完成前处理，主要是各种材料的定义，实体建模，网格划分，边界条件确定及载荷施加，再利用ANSYS磁标量位方法求解，得出铁芯受到的电磁力，并与实验测得的实际作用力进行了比较，计算得到的结果误差很小。分析了一些影响电磁力的因素如材料性质、铁芯与底边框之间的间隙大小、电流强度和线圈匝数等。运用控制变量法对上述
2、因素分别进行计算分析，得到电磁力曲线分布图，由这些计算分析和曲线分布图得出一些结论：铁芯与底边框的间隙越小，电磁力越大；铁芯磁导率越大，电磁力也越强，但是超过200H/m后增加平缓；边框的磁导率越大，电磁力也越强，基本成正比关系；电磁力随着电流增大而增大，超过0.2A后基本成正比；电磁力随线圈匝数增多而增大，超过2500匝后增大变快。这些计算分析及结论可以为抽拉式电磁铁的设计生产提供一些参考。关键词:抽拉式电磁铁；电磁力；有限元仿真。27Finiteelementanalysisofelectromagne
3、ticforceofpullelectromagnetsAbstract:Thisdissertationsummarizesthebasictheoryofelectromagneticfieldandthecomputationofelectromagneticforcebyfiniteelementmethod.ThefiniteelementmodelofapullelectromagnethasbeenestablishedbyusingANSYSsoftwareandnumericalsimul
4、ationshavethenbeenperformed.Firstly,ANSYSsoftwarehasbeenusedtoaccomplishthepreprocessingwhichincludesdefiningmaterials,geometrymodeling,meshing,prescribingboundaryconditionsandapplyingloads.AndthenANSYSscalarmethodhasbeenusedtoobtainmagneticforce,whichissi
5、milartotheresultsofexperiment.Factorsthataffectelectromagneticforcehavebeendiscussed,includingmaterialproperties,theclearancebetweenthecoreandbottomborder,currentintensityandthenumberofcoilwindings.Curvesofelectromagneticforcehavebeendrawnonthecalculatinga
6、ndanalyzingbyusingthemethodofcontrolvariable.Conclusionshavebeenmadethroughanalyzingsimulationresults.Firstly,thatthesmallerthespacebetweenthecoreandthebottomborderis,thelagertheelectromagneticforcewillbe.Secondly,thelagerthepermeabilityofthecoreis,thelage
7、rtheelectromagneticforcewillbeaswell,butit’llincreaseslowlyafterthepermeabilityisover200H/m.Thirdly,electromagneticforceisinproportiontothepermeabilityofthebottomborder.Fourthly,electromagneticforcewillincreasetogetherwiththeincreasingelectricity,andtheyar
8、eproportionalafterelectricityisover0.2A.Finally,theelectromagneticforcewillincreasewiththerisingturnratio,anditclimbsmorequicklyafterturnratioisover2500.Theseconclusionsprovidereferencestothedesignandmanufact
