简介：Thisstudypresentedanoff-lineidentificationmethodofinductionmotor(IM)parameters.Beforestartup,theinverterdriveperformedautomaticallyamodifiedDCtest,alocked-rotortest,ano-loadtestandastep-voltagetesttoidentifyalltheparametersofaninductionmotor.Nomanualoperationandspeedsignalswererequiredintheprocess.Inordertoobtaineffectivemessagesandimprovetheaccuracyofidentification,thediscretefastFouriertransform(DFFT)andtheleast-squareswereusedtoprocessthesignalsofcurrentsandvoltages.Aphase-voltagemeasuringmethodformotorswasalsoproposed,whichmeasureddirectlytheactualconductingtimeofthreeupperswitchesintheinverterwithoutneedforadead-timecompensator.Thevalidity,reliabilityandaccuracyofthepresentedmethodshavebeenverifiedbytheexperimentsonaVSI-fedIMdrivesystem.

简介：1.IntroductionItiswellknownthattheefficiencyandpowerfactorofthesolid-rotorinductionmotorarelowerthanthoseofthecagerotorin-ductionmotorduetolargerleakagereactance.Therefore,conduct-ingendringsareoftenfittedtorotorendstoimprovemotorper-formance.Mostoftheanalysesonthesolid-rotorinductionmotorwithendringshaveassumedthatthemotorisofinfinitecorelengthandtangentialcurrentintherotortobenegligible.

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。