EE2005 - Rotating Machines英文学习材料

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1、EE2005–ACCIRCUITSANDMACHINESSEMESTER2,2010-2011LECTURENOTESONROTATINGMACHINESDCMachines(4Hours)Three-PhaseInductionMotors(4Hours)LecturerAssocProfChooFookHoongSchoolofEEEOfficeLocation:S1-B1c-99OfficePhone:67905384DCMACHINES(GeneratorsandMotors)ContentsGeneralBasicOperatingPrinciplesConstruc

2、tionClassificationDCGeneratorsOperationandcharacteristicsLossesandefficiencyDCMotorsOperationandcharacteristicsLossesandefficiencySpeedcontrolandstartingTorquematchingReferencesG.B.ShresthaandM.H.Haque,“ACCircuitsandMachines”,PearsonPrenticeHall,EducationSouthAsia,Singapore,2006.P.C.Sen,“Pri

3、nciplesofElectricMachinesandPowerElectronics”,JohnWiley&Sons,1997.P.F.Ryff,“ElectricMachinery”,Prentice-Hall,1988.EE2005–ACCircuitsandMachinesDCMachines/Page-1ElectricMachinesAnelectricmachineconvertselectricalenergyintomechanicalenergyormechanicalenergyintoelectricalenergyGenerator:Converts

4、mechanicalenergyintoelectricalenergyMotor:ConvertselectricalenergyintomechanicalenergyElectricalsystemElectricMechanicalsystemMachineEandITandm(orn)MotorEnergyflowGeneratorElectromechanicalenergyconversionInElectricalSystem:Primaryquantitiesarevoltage(VorE)andcurrent(I)InMechanicalSystem:Pr

5、imaryquantitiesaretorque(T)andspeed(morn)ACMachines:ElectricalsystemisACDCMachines:ElectricalsystemisDCCouplingMagneticFieldThecouplingmediumbetweentheelectricalandmechanicalsystemsismagneticfieldandisessentialinallelectromechanicalenergyconversionprocessesEE2005–ACCircuitsandMachinesDCMach

6、ines/Page-2CouplingElectricalMechanicalMagneticSystemFieldSystemEandITandmCouplingmagneticfieldbetweenelectrical&mechanicalsystemsForanideal(orlossless)machineElectricalenergy=MechanicalenergyElectricalpower=MechanicalpowerElectricalpower:Pe=EIW(inDCcircuit)Mechanicalpower:Pm=TmWTistorq

7、ueinNmandmangularvelocityinradian/secForanidealmachinePe=PmEI=TmMachinespeedisusuallymeasured(orgiven)inrevolutionperminute(rpm).However,inpowercalculation,machineangularvelocity(inradian/sec)isused.Therelationshipbetweenspeedn(inrpm)andangular