资源描述：
《AC machines overview 专业英语论文》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、ACmachinesoverviewAbstract:ThispaperintroducesthedevelopmenthistoryofACmachinesandexpoundstheapplicationofSynchronousMachinesandvariableReluctanceMachines.Itmakespeoplerealizeclearlythemachineprincipleofworkandsomeadvantagesanddisadvantages.Thispaperhelpspeopleunderstandthea
2、cmachineinthelifeofthemainfunctionsandthescopeofapplication,sothatthepeoplecanuseACmachinebetter.Keywords:ACmachine,SynchronousMachines,VariableReluctanceMachineIntroduction:Theelectricalmachinethatconvertselectricalenergyintomechanicalenergy,andviceversa,istheworkhorseinadr
3、ivesystem.Amachineisacomplexstructureelectrically,mechanically,andthermally.Althoughmachineswereintroducedmorethanonehundredyearsago,theresearchanddevelopmentinthisareaappearstobeneverending.TextInductionMachinesAmongalltypesofACmachines,theinductionmachine,particularlytheca
4、getype,ismostcommonlyusedinindustry.Thesemachinesareveryeconomical,rugged,andreliable,andareavailableintherangesoffractionalhorsepowertomulti-megawattcapacity.Low-powerFHPmachinesareavailableinsingle-phase,butpoly-phase(three-phase)machinesareused,mostofteninvariable-speeddr
5、ives.Thethree-phasewindingsaredistributedsinusoidallyandembeddedinslots.Inawound-rotormachine,therotorwingingissimilartothatofthestator,butinacagemachine,therotorhasasquirrelcage-likestructurewithshortedendrings.Basicallythemachinecanbelookeduponasathree-phasetransformerwith
6、arotatingandshort-circuitedsecondary.Bothstatorandrotorcoresaremadewithlaminatedferromagneticsteelsheets.Theairgapinthemachineispracticallyuniform.Oneofthemostfundamentalprinciplesofinductionmachinesisthecreationofrotatingandsinusoidallydistributedmagneticfieldintheairgap.Ne
7、glectingtheeffectofslotsandspaceharmonicsduetonon-idealwindingdistribution,itcanbeshownthatasinusoidalthree-phasebalancedpowersupplyinthethree-phasestatorwindingcreatesasynchronouslyrotatingmagneticfield.Therotorwindingwillbesubjectedtoasweepingmagneticfield,andhaveinducingc
8、urrentintheshort-circuitedrotor.Theinteractionofairgapfluxandrotormmfproduc
