CTERISTICSOFTHEMAXIMUMTORQUEPERAMPEREANDFLUXWEAKENINGCONTROLMETHODThecharacteristicsoftheMTPA+FWcontrolmethodwereexaminedindetail.Thereferencespeedandloadtorqueusedweremin-and.Nm,respectively.Thedc-busvoltagecharacteristicsareshowninFig.,andthoseoftheconverterinputvoltageandcurrentareshowninFig..WhenthecapacityofthesmoothingcapacitorisμF,thedc-busvoltagedcVissmoothed.However,thedc-busvoltageVdcisnotsmoothedwhenthecapacityofthesmoothingcapacitorisμF.(assumingafilmcapacitor)Inaddition,whenthecapacityofthesmoothingcapacitorisμF,theconductionwidthofthediodeisnarrowedandtheconverterinputpowerfactorisworsened.Incontrast,theconductionwidthofthediodeiswidenedandtheconverterinputpowerfactorisimprovedwhenthecapacityofthesmoothingcapacitorisμF.Thecharacteristicsofmotorefficiency,torqueripple,andconverterinputpowerfactorwereexaminedforchangingreferencespeedω*andloa述。
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