Electric Machinery 电机学 英汉双语 教学课件 作者 刘慧娟 英文课件Chapter1-DC machine.ppt

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1、Chapter1DCMachines1.1Introductiontodcmachines1.2Armaturewindings1.3Magneticfieldsofdcmachines1.4Inducedvoltageandelectromagnetictorque1.5Equivalentcircuitofadcmachine1.6Powerflowandlossesindcmachine1.7Operationcharacteristicsofdcgenerator1.8Operationcharacteristicsofdcmotors1

2、.9Speedcontrolofshuntdcmotor1.10Startingofdcmotor1.11Brakingofdcmotor1.12CommutationBriefContent1.1.1TheConstructionofDCMachinesDCMachine(Armaturecore)(Armaturewinding)(Brushes)(Brushes)(Commutator)(Shaft)FieldpoleFieldwindingThecross-sectionofadcmachine(interpole)(Fieldpole)

3、(York)(Armaturecore)(Armaturewinding)(Frame)FieldwindingSheetofrotorStatorandRotorAirgapwhichisseparatingstatorandrotorStationarypart:Frame,FieldPoleandBrushesRotatingpart:Armaturecore，WindingShaftandCommutatorDCMachinesThearmaturewindingisplacedintherotorslotandconnectedtoro

4、tatingcommutatorwhichrectifiestheinducedvoltageThebrusheswhichareconnectedtothearmaturewinding,rideoncommutator1.1.2OperationPrincipleofDCMachines(sliprings)（brushes）(commutator)（brushes）DCMotors:operationprinciplesSupplyaDCvoltagetothebrushesXandY.1.1.3ExcitationtypesofDCMac

5、hinesSeparatelyexcitedDCmachineShunt(excited)DCmachineSeries(excited)DCmachineCompounded(excited)DCmachineDCMotor＋－＋－＋－他励(Separatelyexcited)+-并励(Shuntexcited)+_串励(Seriesexcited)复励(Compoundexcited)－＋－＋＋－他励(Separatelyexcited)－＋并励(Shuntexcited)－＋串励(Seriesexcited)复励(Compoundexcit

6、ed)DCGenerator1、Ratedpower：W,kWMotor:theoutputmechanicalpower：Generator:theoutputelectricalpower：2、Ratedcurrent：A3、Ratedvoltage：V4、Ratedspeed：r/min5、Ratedexcitationcurrent：A6、Ratedexcitationvoltage：V8、Polenumber：polepairnumber1.1.4RatingsofdcmachinesExample1-1Adcgenerator,its

7、ratedpowerPN=10kW,ratedvoltageUN=230V,ratedspeednN=2850r/min,ratedefficiencyN=0.85.Calculateitsratedcurrentanditsratedinputpower?Solution:theratedcurrentofthedcgeneratorisIN=PN/UN=10*1000/230=43.48(A);TheratedinputpowerisP1=PN/N=10*1000/0.85=11765(W).Example1-2Adcmotor,itsr

8、atedpowerPN=17kW,ratedvoltageUN=220V,ratedspeednN=1500r/min,ratedeff