4_Electrically excited synchronous machine (1).pdf

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1、4.4.ElectricallyexcitedsynchronousmachinesElectricallyexcitedsynchronousmachinesSource:SiemensAG,GermanyDARMSTADTDept.ofElectricalEnergyConversionUNIVERSITYOF4/1TECHNOLOGYProf.A.BinderACRotatingfieldmachines:Basicprinciple•ACrotatingfieldmachines:Inductionmachin

2、es,synchronousmachines•Example:Salientpolerotorsynchronousmachine:Workingprinciple:2-polerotatingfield•3-phasesinuscurrentsystem(rmsI)instator3-phasewindingexcitesrotatingstatorfield.s•Excitingrotorwinding(“salientpoles”)fedvia2slipringswithDCcurrent:“fieldcurre

3、ntIA2-polerotormagneticDCfieldisexcited.•The2-polestatorrotatingfieldpullsviamagneticforcetherotorSYNCHRONOUSLY.•ForcalculatingtheoperationalperformanceofACrotatingfieldmachinesthecalculationoftherotatingfieldanditseffects(voltageinduction,torquegeneration)isnee

4、ded.WeuseAMPERE´slaw,FARADAY´sinductionlaw,windingschemesandFOURIER-analysis.DARMSTADTDept.ofElectricalEnergyConversionUNIVERSITYOF4/2TECHNOLOGYProf.A.BinderSynchronousmachinewithroundrotorandsalientpolerotorROUNDROTOR:FieldwindingdistributedSALIENTPOLEROTOR:con

5、centratedfieldwindinginrotorslots;constantairgaponrotorpoles;airgapisminimumatpolecentre•Synchronousmachine:RotorfieldwindingexcitesstaticmagneticrotorfieldwithDCfieldcurrentIf.•MOTOR-operation:Stator3-phaseaccurrentsystemIsexcitesstatorrotatingairgapfield.Thisf

6、ieldrotateswithn=fs/pandattractsrotormagneticfield,whichhassamenumberofpoles.Sorotorwillrotatesynchronouslywithstatorfield.•GENERATOR-mode:Rotorisdrivenmechanically,andinduceswithrotorfieldinthestatorwindinga3-phasevoltagesystemwithfrequencyf=n.p.Statorcurrentdu

7、etosthisvoltageexcitesstatorfield,whichrotatessynchronouslywithrotor.DARMSTADTDept.ofElectricalEnergyConversionUNIVERSITYOF4/3TECHNOLOGYProf.A.BinderSynchronousmachinewithroundrotor:TurbinegeneratorforthermalpowerplantStator:36slots,two-layerwinding,1turn/coilq=

8、6slotsperpolesandphase21kVratedvoltageSource:SiemensAG,Two-poleconfiguration:Rotorwindinginrotorslots;Germanyleft:crosssectionwithq=5rotorcoilsperpolerright:no-loadfi