简介：OnMarch13th,ReutersreportedthatthelongrunversionofTeslaModel3willusepermanentmagnetmotors.Oneofthematerialsforthistypeofmotorisrareearthmetalneodymium,whichwillfurtherincreasethesupplypressureofneodymium.Governmentsaroundtheworldarecommittedtoreducingtheharmfulemissionsproducedbyfossilfuelcars,pushingupdemandforelectricvehiclesand

简介：Neuromuscularactivityissuppressedduringmaximaleccentric（ECC）musclecontractioninuntrainedsubjectsowingtoattenuatedlevelsofcentralactivationandreducedspinalmotorneuron（MN）excitabilityindicatedbyreducedelectromyographysignalamplitude,diminishedevokedH-reflexresponses,increasedautogenicMNinhibition,anddecreasedexcitabilityindescendingcorticospinalmotorpathways.MaximumECCmuscleforcerecordedduringmaximalvoluntarycontractioncanbeincreasedbysuperimposedelectricalmusclestimulationonlyinuntrainedindividualsandnotintrainedstrengthathletes,indicatingthatthesuppressioninMNactivationismodifiablebyresistancetraining.Insupportofthisnotion,maximumECCmusclestrengthcanbeincreasedbyuseofheavy-loadresistancetrainingowingtoaremovedordiminishedsuppressioninneuromuscularactivity.Prolonged（weekstomonths）ofheavy-loadresistancetrainingresultsinincreasedH-reflexandV-waveresponsesduringmaximalECCmuscleactionsalongwithmarkedgainsinmaximalECCmusclestrength,indicatingincreasedexcitabilityofspinalMNs,decreasedpresynapticand/orpostsynapticMNinhibition,andelevateddescendingmotordrive.Notably,theuseofsupramaximalECCresistancetrainingcanleadtoselectivelyelevatedV-waveresponsesduringmaximalECCcontraction,demonstratingthatadaptivechangesinspinalcircuitryfunctionand/orgainsindescendingmotordrivecanbeachievedduringmaximalECCcontractioninresponsetoheavy-loadresistancetraining.

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简介：摘要由于新能源电动汽车用永磁同步电机要求具有高功率密度，体积小，重量轻以及输出转矩大等特点，这需要电机具有较高的电负荷和磁负荷，然而这些都会产生较高的铜损和铁损，使电机发热过快，温升变高。因此，针对永磁同步电机的温度场分析是十分有必要的。本文以额定功率为80kw的电动客车用永磁同步电机为研究对象，通过热路法对该电机进行了温度场仿真，并通过实验验证了仿真的正确性。