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1、电机拖动试题ThemotorisdraggingthetestbankmotortodragthetestlibraryChoicechoice1,ademotortodragaseparatelyexciteddegenerator,whenthemotorvoltage,excitationcurrentunchanged,increasetheloadofgenerator,motorarmaturecurrentandrotatingspeednwill()・NreduceBanddecreaseswitht
2、heincreaseoftheA,andhighernC,reduction,nreduce2,Ashuntdemotor,whenthetorqueunchanged,ifthesupplyvoltageUdropof0.5times,ignoringtheinfluenceofarmaturereactionwiththemagneticcircuitsaturation,atthistimethespeedofthemotor():A,Bconstantreducedto0.5timesthatoftheori
3、ginslspeed,speed,speeddownD,unabletodetermine3C,demotorintheprocessofseriesresistancespeedregulation,iftheloadtorqueremainsthesame,willremainthesame()A,theinputpower,outputpower,BC,Delectromagneticpower,theefficiencyofthemachineWhenstartingdemotor,themagneticci
4、rcuitcircuitshould()power.A,andthearmatureloopaccessatthesametime,beforethearmatureloopaccessCB,thanthearmatureloopaccessafter5,Ashuntdemotorwillchangethesinglelapwindingforsingle-wavewinding,maintainitsbranchcurrentisconstant,electromagnetictorquewillbe.A,B,ch
5、angeC,getsmaller6,shuntdemotorfluxincreased10%,whenloadtorqueisconstantunchanged(T2),regardlessofthesaturationandtheinfluenceofarmaturereaction,stableelectricmotor,thefollowingquantitstivechangeinto:n,la,P2・A,B,reducetheC,basicallythesame7,theexcitationdemotori
6、sbrokenatruntime,themotorwill()・A,theflyingcarB,thestopC,thepossibilityofAflyingcar,ortheratedpowerofan8,demotor・A,themechanicalpowerthatisabsorbedontheshaft,themechanicalpower,theoutputofthepowerD,andtheoutputofthearmatureport・Inordertoenabletheelectricfunctio
7、ntostartuptotheratedspeed,theelectromagnetictorqueisgreaterthantheloadtorque・A,averageB,instantC,ratedWhenthetorqueoftheloadisconstant,theexcitationcircuitofthedemotorissetintheresistance,andthearmaturecurrentwillturn()・B,constant,riseC,rise,riseA,up,downThedeg
8、eneratorisonthegeometriccenterline,andifthemagneticpathissaturated,thearmaturereactionis()a12,three-phaseasynchronousmotorinoperation,taketwooppositestator,therotorspeedwill
