西工大電機(jī)與拖動(dòng)試題庫

1、Delegatesstaff:Hello!intherunuptotheSpringFestivalweheldonesessionoffourstaffrepresentativesConference2013wkshopfullbackin2012carefulanalysisofthecurrentsituationdiscuss2013developmentplans.Hereonbehalfofmycompany2013wkr

2、eptstotheGeneralAssemblyfconsideration.PillarI2012backin2012XXpowercompaniesadheretothepartys17greatspiritfguidancecomprehensivelyimplementthescientificconceptofdevelopmentpromotingcostleadershipstrategystardsfocusonimpl

3、ementationleanmanagementcontinuouslyimprovesmoothpresentsafetysituationofenterprisemanagementbusinessmanagementcontrolscientificstardizedthededicationofstaffmanageaharmoniousdemocraticatmosphereofthegoodsituation.Mainind

4、icatsareasfollows:thebatteryindicat:powergenerationtotaled7.815billionkWhbeyondtheannualbudgetimplementationcapacityof315millionkWhanincreaseof757millionkWh.Salestotaled7.425billionkWhexceedingsalesof330millionkWhtheannu

5、alExecutivebudgetanincreaseof729millionkWh.Securitymeasures:unplannedoutages2.5times.Nopersonalinjuryaccidentoccurrednomajaccidentabovenomajfireaccidentswithoutenvironmentalpollutionaccidentssafetyfthreeconsecutiveyearst

6、omaintainstabilitytogoodposture.–Businessfinancialindicats:totalprofitsof255millionYuanbeyondtheannualbudgetof207millionYuanbeyondtheDatangcompanyindex41.89millionYuananincreaseof1.76millionYuanFCMassessmentatgradefour.E

7、nergy:powersupplystardcoalcompleting312.25gkWhdown0.1gkWhintegratedauxiliarypowerconsumptionratioin5.12%down0.26%pollutantemissionsperfmancegreatlyreducedcomparedtolastyearcarbon0.09gkWhsulfurdioxide0.104gkWhNOx0.512gkWh

8、dustremovalefficiencyofmethan99.8%.Reliabilityindex:equivalentavailabilityfactin93.47%increased7.95%fromayearearlier.Equivalentfcedoutagerate0.08%0.16%reductionoverthesameperiodayearearlier.Majachievements:firstweshoulda

9、dheretothetwo“managementsystem“basisstrengtheningtechnologicalresearchstrengthenhiddenhazardscontrolintrinsicsafetyEnterpriseconstructiontooknewsteps.Thetwo“managementsystem“fimprovement.Focusonpromotingthepowerofthecomp

10、anymanagementsystemtheapplicationimplementationofthesafetyloopfivestarmanagementsystemimprovethesafetymanagementsystemrealizethesystemofsafetycontrol.Furtherregulatesecurityroutinessafetysupervisionmanagementwkroletoplay

11、toachieveclosedloop.Strengtheningthesupervisionmanagementofhabitualviolationofstrengtheningthesafetysupervisionofoutsourcingcontracts.Carriedoutinspringautumnofsecurityinspectionsfloodcontrolinspectionsafetyproductionmon

12、thdaysupervisionofproductionsafetytheOlympicGamesotheractivitiescomprehensivetampingSafetyFoundation...Troubleshootingmanagementmechanismgivefullplaytoroleoftechnicalsupervisionrealizationoftroubleshootingmanagementimpro

13、vedprocessmanagement.Thisyearcompletedtheboilerlowerheaderleakageboilerpressureamajriskmanagementcompleted29ofgreatrisks3Generalproblemsofgovernance.Completechemistrylabconstructionthermalcontrolcompletetheboilerscaleint

14、egratedmanagementhostshaftingvibrationof10scientifictechnologicalprojectssuchas.Completesupercritical630MWonlinesimulationsystemdevelopmentapplicationofcirculatingwaterMCCstbypowertransfmationthetransfmationofdesulfuriza

15、tionwastewatertheunitwatersupplysystemofcomprehensivetreatmentdisgevalvemodificationofcoalmill5keytechnologicaltransfmationprojectsgrouphealthisimproved.Sciencetechnologyinnovationisfurtherincreased.Strengthentheacterist

16、icsofsupercriticalunitmajissuesgraduallyclearingtheparticularityofsupercriticalunitregularity.Developedmotoiltimemanagementswitchactiontimesstatisticscoalaidedmeasurementsoftwareimprovestheproductionlevelofleanmanagement

17、.Increasedinvestmentinsciencetechnologyreptingsciencetechnologyprojects14technicalprojecttotalcostpercentageofthetotalannualproductionoutputof0.25%.“Largescalecoalfiredpowerplantfluegasdesulfurizationdenitrificationcompl

18、etedevelopmentapplicationofkeytechnologies“projectwonthenationalsciencetechnologyprogresssecondprize.630MWsupercriticalunitsoptimizedcontrolstrategiesthe630MWdevelopmentapplicationofonlinesimulationsystemfsupercriticalun

19、itssupercritical600MWunitsofturbinedrivenboilerfeedpumpsetofcomprehensivetreatmentofdefectsDatangtechnologyrespectivelyonetwothird.Meanwhileinfmationtechnologyachievementsthecompanywasnamed“Chinapowerinfmationtechnologyb

20、enchmarkingenterprises.“Repairmaintenancehasimprovedfurther.Modifytheinspectionstardsstardsonaregularbasisstardizingwkprocedurescheckinginspectionproject.DeepeningtheBFSsystemimplementsmaintenanceinfmationshared.Reganizi

21、ngRBlogicagainensurethesuccessoftheRB.Innovatingthemechanismofmaintenancemanagementimplementedaprojectmanagersystem.Successfulcompletionoftwoautonomousmaintenancereliabilityimprovedsteadily.Implementingtwoclevelmaintenan

22、ceprojectthemselves48.7%42.3%respectively.AccomplishtwocirculatingpumpsrepairoverhauloffourMillsmaintenanceteamstogetexercise.Promotethewkofenergysavingconsumptionreducingcompletetheunitenergyconsumptiondiagnosisplantwat

23、erbalancetest10energysavingprojects.Secondweshouldadhereto“three“ontheeconomicbenefitsofimprovingoutreach西北工業(yè)大學(xué)西北工業(yè)大學(xué)《電機(jī)與拖動(dòng)》最新試題庫《電機(jī)與拖動(dòng)》最新試題庫第一部分第一部分直流電機(jī)直流電機(jī)一、填空題一、填空題：1、并勵(lì)直流發(fā)電機(jī)自勵(lì)建壓的條件是_____________________。(主磁路存在剩磁；并聯(lián)在電

24、樞兩端的勵(lì)磁繞組極性要正確，使勵(lì)磁電流產(chǎn)生的補(bǔ)充磁通方向與剩磁磁通方向相同；勵(lì)磁回路的總電阻必須小于臨界電阻)2、可用下列關(guān)系來判斷直流電機(jī)的運(yùn)行狀態(tài)，當(dāng)_______時(shí)為電動(dòng)機(jī)狀態(tài)，當(dāng)_______時(shí)為發(fā)電機(jī)狀態(tài)。（Ea〈U；Ea〉U）3、直流發(fā)電機(jī)的繞組常用的有_______和_______兩種形式，若要產(chǎn)生大電流，繞組常采用_______繞組。（疊繞組；波繞組；疊）4、直流發(fā)電機(jī)電磁轉(zhuǎn)矩的方向和電樞旋轉(zhuǎn)方向_______，直流電動(dòng)

25、機(jī)電磁轉(zhuǎn)矩的方向和電樞旋轉(zhuǎn)方向_______。（相反；相同）5、單迭和單波繞組，極對(duì)數(shù)均為p時(shí)，并聯(lián)支路數(shù)分別是_______，_______。（2p；2）6、直流電機(jī)的電磁轉(zhuǎn)矩是由_______和_______共同作用產(chǎn)生的。（每極氣隙磁通量；電樞電流）7、直流電機(jī)電樞反應(yīng)的定義是_______，當(dāng)電刷在幾何中線時(shí)，電動(dòng)機(jī)產(chǎn)生_______性質(zhì)的電樞反應(yīng)，其結(jié)果使_______和_______，物理中性線朝_______方向偏移。（電

26、樞磁動(dòng)勢(shì)對(duì)勵(lì)磁磁動(dòng)勢(shì)的作用；交磁；氣隙磁場產(chǎn)生畸變；對(duì)主磁場起附加去磁作用）二、判斷題二、判斷題1、一臺(tái)并勵(lì)直流發(fā)電機(jī)，正轉(zhuǎn)能自勵(lì)，若反轉(zhuǎn)也能自勵(lì)。（）（F）2、一臺(tái)直流發(fā)電機(jī)，若把電樞固定，而電刷與磁極同時(shí)旋轉(zhuǎn)，則在電刷兩端仍能得到直流電壓。（）（T）3、一臺(tái)并勵(lì)直流電動(dòng)機(jī)，若改變電源極性，則電機(jī)轉(zhuǎn)向也改變。（F）4、直流電動(dòng)機(jī)的電磁轉(zhuǎn)矩是驅(qū)動(dòng)性質(zhì)的，因此穩(wěn)定運(yùn)行時(shí)，大的電磁轉(zhuǎn)矩對(duì)應(yīng)的轉(zhuǎn)速就高。（）（F）三、選擇題三、選擇題1、直流發(fā)

27、電機(jī)主磁極磁通產(chǎn)生感應(yīng)電動(dòng)勢(shì)存在于（）中。（1）（1）電樞繞組；（2）勵(lì)磁繞組；（3）電樞繞組和勵(lì)磁繞組2、直流發(fā)電機(jī)電刷在幾何中線上，如果磁路不飽和，這時(shí)電械反應(yīng)是（）（3）（1）去磁；（2）助磁；（3）不去磁也不助磁。3、如果并勵(lì)直流發(fā)電機(jī)的轉(zhuǎn)速上升20%，則空載時(shí)發(fā)電機(jī)的端電壓U0升高（）。（2）（1）20%；（2）大于20%；（3）小于20%。四、簡答題四、簡答題1、直流發(fā)電機(jī)的勵(lì)磁方式有哪幾種？Delegatesstaff:H

28、ello!intherunuptotheSpringFestivalweheldonesessionoffourstaffrepresentativesConference2013wkshopfullbackin2012carefulanalysisofthecurrentsituationdiscuss2013developmentplans.Hereonbehalfofmycompany2013wkreptstotheGeneral

29、Assemblyfconsideration.PillarI2012backin2012XXpowercompaniesadheretothepartys17greatspiritfguidancecomprehensivelyimplementthescientificconceptofdevelopmentpromotingcostleadershipstrategystardsfocusonimplementationleanma

30、nagementcontinuouslyimprovesmoothpresentsafetysituationofenterprisemanagementbusinessmanagementcontrolscientificstardizedthededicationofstaffmanageaharmoniousdemocraticatmosphereofthegoodsituation.Mainindicatsareasfollow

31、s:thebatteryindicat:powergenerationtotaled7.815billionkWhbeyondtheannualbudgetimplementationcapacityof315millionkWhanincreaseof757millionkWh.Salestotaled7.425billionkWhexceedingsalesof330millionkWhtheannualExecutivebudge

32、tanincreaseof729millionkWh.Securitymeasures:unplannedoutages2.5times.Nopersonalinjuryaccidentoccurrednomajaccidentabovenomajfireaccidentswithoutenvironmentalpollutionaccidentssafetyfthreeconsecutiveyearstomaintainstabili

33、tytogoodposture.–Businessfinancialindicats:totalprofitsof255millionYuanbeyondtheannualbudgetof207millionYuanbeyondtheDatangcompanyindex41.89millionYuananincreaseof1.76millionYuanFCMassessmentatgradefour.Energy:powersuppl

34、ystardcoalcompleting312.25gkWhdown0.1gkWhintegratedauxiliarypowerconsumptionratioin5.12%down0.26%pollutantemissionsperfmancegreatlyreducedcomparedtolastyearcarbon0.09gkWhsulfurdioxide0.104gkWhNOx0.512gkWhdustremovaleffic

35、iencyofmethan99.8%.Reliabilityindex:equivalentavailabilityfactin93.47%increased7.95%fromayearearlier.Equivalentfcedoutagerate0.08%0.16%reductionoverthesameperiodayearearlier.Majachievements:firstweshouldadheretothetwo“ma

36、nagementsystem“basisstrengtheningtechnologicalresearchstrengthenhiddenhazardscontrolintrinsicsafetyEnterpriseconstructiontooknewsteps.Thetwo“managementsystem“fimprovement.Focusonpromotingthepowerofthecompanymanagementsys

37、temtheapplicationimplementationofthesafetyloopfivestarmanagementsystemimprovethesafetymanagementsystemrealizethesystemofsafetycontrol.Furtherregulatesecurityroutinessafetysupervisionmanagementwkroletoplaytoachieveclosedl

38、oop.Strengtheningthesupervisionmanagementofhabitualviolationofstrengtheningthesafetysupervisionofoutsourcingcontracts.Carriedoutinspringautumnofsecurityinspectionsfloodcontrolinspectionsafetyproductionmonthdaysupervision

39、ofproductionsafetytheOlympicGamesotheractivitiescomprehensivetampingSafetyFoundation...Troubleshootingmanagementmechanismgivefullplaytoroleoftechnicalsupervisionrealizationoftroubleshootingmanagementimprovedprocessmanage

40、ment.Thisyearcompletedtheboilerlowerheaderleakageboilerpressureamajriskmanagementcompleted29ofgreatrisks3Generalproblemsofgovernance.Completechemistrylabconstructionthermalcontrolcompletetheboilerscaleintegratedmanagemen

41、thostshaftingvibrationof10scientifictechnologicalprojectssuchas.Completesupercritical630MWonlinesimulationsystemdevelopmentapplicationofcirculatingwaterMCCstbypowertransfmationthetransfmationofdesulfurizationwastewaterth

42、eunitwatersupplysystemofcomprehensivetreatmentdisgevalvemodificationofcoalmill5keytechnologicaltransfmationprojectsgrouphealthisimproved.Sciencetechnologyinnovationisfurtherincreased.Strengthentheacteristicsofsupercritic

43、alunitmajissuesgraduallyclearingtheparticularityofsupercriticalunitregularity.Developedmotoiltimemanagementswitchactiontimesstatisticscoalaidedmeasurementsoftwareimprovestheproductionlevelofleanmanagement.Increasedinvest

44、mentinsciencetechnologyreptingsciencetechnologyprojects14technicalprojecttotalcostpercentageofthetotalannualproductionoutputof0.25%.“Largescalecoalfiredpowerplantfluegasdesulfurizationdenitrificationcompletedevelopmentap

45、plicationofkeytechnologies“projectwonthenationalsciencetechnologyprogresssecondprize.630MWsupercriticalunitsoptimizedcontrolstrategiesthe630MWdevelopmentapplicationofonlinesimulationsystemfsupercriticalunitssupercritical

46、600MWunitsofturbinedrivenboilerfeedpumpsetofcomprehensivetreatmentofdefectsDatangtechnologyrespectivelyonetwothird.Meanwhileinfmationtechnologyachievementsthecompanywasnamed“Chinapowerinfmationtechnologybenchmarkingenter

47、prises.“Repairmaintenancehasimprovedfurther.Modifytheinspectionstardsstardsonaregularbasisstardizingwkprocedurescheckinginspectionproject.DeepeningtheBFSsystemimplementsmaintenanceinfmationshared.ReganizingRBlogicagainen

48、surethesuccessoftheRB.Innovatingthemechanismofmaintenancemanagementimplementedaprojectmanagersystem.Successfulcompletionoftwoautonomousmaintenancereliabilityimprovedsteadily.Implementingtwoclevelmaintenanceprojectthemsel

49、ves48.7%42.3%respectively.AccomplishtwocirculatingpumpsrepairoverhauloffourMillsmaintenanceteamstogetexercise.Promotethewkofenergysavingconsumptionreducingcompletetheunitenergyconsumptiondiagnosisplantwaterbalancetest10e

50、nergysavingprojects.Secondweshouldadhereto“three“ontheeconomicbenefitsofimprovingoutreach22110100CuaaaPRIWW????110fPW?2211020CubbaPUIWW??????輸出功率：211()1755.25CuafCubmecFePPPPPPPPPW??????????效率：21100%75.98%PP????2、一臺(tái)并勵(lì)直流發(fā)

51、電機(jī)，銘牌數(shù)據(jù)如下：PN=6kW，UN=230V，nN=1450rmin，Ra=0.57Ω（包括電刷接觸電阻），勵(lì)磁回路總電阻Rf=177Ω，額定負(fù)載時(shí)的電樞鐵損PFe=234W，機(jī)械損耗為Pmec=61W，求：（1）額定負(fù)載時(shí)的電磁功率和電磁轉(zhuǎn)矩。（2）額定負(fù)載時(shí)的效率。解：（1）26NPPkW??2201.3177fffUIAAR???2299fffPRIW??600026.1230NNNPIAAU???27.4aNfIIIA???

52、2427.9CuaaaPRIW??所以26726.9emCuafPPPPW????6726.944.32145060ememPTNmNm????????（2）17021.9emmecFePPPPW????21100%85.45%PP????3、一臺(tái)并勵(lì)直流發(fā)電機(jī)，銘牌數(shù)據(jù)如下：PN=23kW，UN=230V，nN=1500rmin，勵(lì)磁回路電阻Rf=57.5Ω，電樞電阻Ra=0.1Ω不計(jì)電樞反應(yīng)磁路飽和。現(xiàn)將這臺(tái)電機(jī)改為并勵(lì)直流電動(dòng)機(jī)運(yùn)