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1、谁能回答变频器的问题Chapter1maincircuitoffrequencyconverter1.,whyistheunitofratedcapacityofmotorkW,whiletheunitofratedcapacityoffrequencyconverteriskVA?2.whyinverterbridgemustadoptpowertransistor?3.whatisthemaincircuitofanACDCcycloconverter?4.whatistheallowablerangeoftheinputvoltageoftheinverter,340~420V,an
2、dwhatistherangeoftheDCaveragevoltage?What'stheeffectofthe5.currentlimitingresistor?Burnedouthowtomatch?What，sthefunctionofthe6.voltageresistance?Whatisthepossiblecauseoftheburnoutofaconstantvoltageresistor?7.whatisthefunctionoftheDCpowerindicator?Whyisthediode8.paralleltothereversediode?9.whenthem
3、otorisrunningat50Hz,thecurrentis80A,andtheinputcurrentoftheconverteriscloseto80A.Ifthemotorisrunningat20Hz,thecurrentisstill80A・Whatistheinputcurrentoftheinverter?10.whentheoutputvoltageoftheconverterisequalto150V,250Vand380V,whatistheirpulseheight?9.todeterminewhethertheinverterisoverloaded,which
4、partofthecurrentshouldbemeasured?Whichpartofthecurrentshouldbemeasuredwhenmeasuringtheelectricalenergyconsumedbythefrequencyconversiondrivesystem?10.whydoestheparallelcompensationcapacitorintheinputsideoftheinverternotchangethepowerfactor?11.infrequencyconversiontimingsystem,whatistheinfluenceofth
5、epowerfactorofthemotorontheinputsideoftheinverter?12.whatpartsoftheconvertermaybeasourceofinterferencetootherequipmentduringoperation?13.aconstantpressurewatersupplysystem,thefrequencyconverterrunning,theflowmetercannotworkproperly,whatmeasurescanbetakentosolve?Thesecondchapteristheloadcharacteris
6、ticofthemotorafterfrequencyconversion1.inverterintheinverteratthesametime,whyhavetochangethepressure?2.whyisthemotortorqueliftinginlowfrequency?3.whatisthecontrolmodeoffrequencyconverter?Whatarethemainfeaturesandscopeofapplicationofvariouscontrolmodes?4.whydoesthefrequencyconverterhavetosetmanyU/f
7、linesfortheusertochoose?1.frequencycontrol,thelightertheload,thesmallerthecurrentlaw,whysometimesdoesnotapply?2.thefrequencyconvertersometimeshasover-currentprotectioninlightload・Whatisthereason?Whatistheinfluenc
