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ID:34519828
大小:4.11 MB
页数:46页
时间:2019-03-07
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1、4.4.ElectricallyexcitedsynchronousmachinesElectricallyexcitedsynchronousmachinesSource:SiemensAG,GermanyDARMSTADTDept.ofElectricalEnergyConversionUNIVERSITYOF4/1TECHNOLOGYProf.A.BinderACRotatingfieldmachines:Basicprinciple•ACrotatingfieldmachines:Inductionmac
2、hines,synchronousmachines•Example:Salientpolerotorsynchronousmachine:Workingprinciple:2-polerotatingfield•3-phasesinuscurrentsystem(rmsI)instator3-phasewindingexcitesrotatingstatorfield.s•Excitingrotorwinding(“salientpoles”)fedvia2slipringswithDCcurrent:“fiel
3、dcurrentIA2-polerotormagneticDCfieldisexcited.•The2-polestatorrotatingfieldpullsviamagneticforcetherotorSYNCHRONOUSLY.•ForcalculatingtheoperationalperformanceofACrotatingfieldmachinesthecalculationoftherotatingfieldanditseffects(voltageinduction,torquegenerat
4、ion)isneeded.WeuseAMPERE´slaw,FARADAY´sinductionlaw,windingschemesandFOURIER-analysis.DARMSTADTDept.ofElectricalEnergyConversionUNIVERSITYOF4/2TECHNOLOGYProf.A.BinderSynchronousmachinewithroundrotorandsalientpolerotorROUNDROTOR:FieldwindingdistributedSALIENTP
5、OLEROTOR:concentratedfieldwindinginrotorslots;constantairgaponrotorpoles;airgapisminimumatpolecentre•Synchronousmachine:RotorfieldwindingexcitesstaticmagneticrotorfieldwithDCfieldcurrentIf.•MOTOR-operation:Stator3-phaseaccurrentsystemIsexcitesstatorrotatingai
6、rgapfield.Thisfieldrotateswithn=fs/pandattractsrotormagneticfield,whichhassamenumberofpoles.Sorotorwillrotatesynchronouslywithstatorfield.•GENERATOR-mode:Rotorisdrivenmechanically,andinduceswithrotorfieldinthestatorwindinga3-phasevoltagesystemwithfrequencyf=n
7、.p.Statorcurrentduetosthisvoltageexcitesstatorfield,whichrotatessynchronouslywithrotor.DARMSTADTDept.ofElectricalEnergyConversionUNIVERSITYOF4/3TECHNOLOGYProf.A.BinderSynchronousmachinewithroundrotor:TurbinegeneratorforthermalpowerplantStator:36slots,two-laye
8、rwinding,1turn/coilq=6slotsperpolesandphase21kVratedvoltageSource:SiemensAG,Two-poleconfiguration:Rotorwindinginrotorslots;Germanyleft:crosssectionwithq=5rotorcoilsperpolerright:no-loadfi
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