资源描述：
《连续高压脉冲下空间电荷对变频牵引电机绝缘老化影响的研究》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、西南交通大学硕士学位论文连续高压脉冲下空间电荷对变频牵引电机绝缘老化影响的研究姓名：周力任申请学位级别：硕士专业：高电压与绝缘技术导教师：吴广宁20100501AbstractInverter-fedmotorisanindispensableequipmentforthedevelopmentofhigh-speedrailwayinChina.AsacorecomponentofACdriveelectriclocomotive,performanceofinverter-fedmotordirectlyinfluencesthestability
2、andreliabilityoflocomotiverunning.However,PulseWidthModulation(PWM)whichwasinputfrominverterischaracterizedbysteeprisingedgeandhighfrequency,resultinginthetooearlyfailureofmotorinsulation.Presently,polyimidefilmcharacterizedbyhightemperatureresistance(400°C),lowtemperaturetolera
3、nce(-269°C),radiationresistanceandexcellentdielectricpropertieswidelyappliedinturntoturninsulationandturntogroundinsulationofinverter-fedmotorsisakindofbasicinsulatingmaterial.AstraditionaldesignmethodandtheoryforACmotorisnotcompletelysuitableforinverter-fedmotor,consequently,re
4、searchontheagingandfailuremechanismofinsulatingmaterialunderhighvoltagepulsecanprovidetheoreticalfoundationforthedesignofinverter-fedmotorinsulationstructureandprolongservicelife.Spacechargeplaysanimportantroleindamaginginsulationunderhighvoltagepulse.Developresearchworkinaccord
5、ancewithinfluenceofspacechargeonagingofinverter-fedmotorinsulationunderhighvoltagepulse.Firstly,constructagingandspacechargemeasurementsystem;measurespacechargeaccumulationthresholdfieldbetweencorona-resistant(lOOCR)andcommonpolyimidefilms(lOOHN)andanalyzetheinfluenceofaddingnan
6、o-particlesondielectricpropertyofinsulatingmaterial.Furthermore,spacechargedistributioninpolyimidefilmsunderdifferenttemperaturewasmeasured,basedonwhichspacechargecharacteristicsunderhighvoltagepulsewereresearched.Secondly,bymeansofScanningElectricalMicroscope(SEM),effectsofagin
7、gtimeandfrequencyonsurfaceandsectionmorphologywereanalyzed,basedonwhichthecausefornano-particlesimprovingcorona-resistantpropertywasresearched.Finally,conductexperiment,includingelectricalbreakdown,thermalbreakdownandelectricaltreebreakdown,onmagnetwires;meanwhilecombiningwithSE
8、Mandenergyspectrumanalysis,thecorrespondingbrea
