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1、BasicPrinciplesandFunctionsofElectricalMachines1*12O.I.Okoro,Ph.D.,M.U.Agu,Ph.D.,andE.Chinkuni,Ph.D.1DepartmentofElectricalEngineering,UniversityofNigeria,Nsukka,EnuguState,Nigeria*E-mail:oiokoro@hotmail.com2PolytechnicUniversityofNamibia,Windhoek,NamibiaE-mail:chikuni@yahoo.comABS
2、TRACTthestatorandalternatingcurrentsareinducedintherotorbytransformeraction.Recentadvancesinpowerelectronicsandhigh-speedmicroprocessorshaveledtoconsiderableInthesynchronousmachine,directcurrentisattentioninelectricalmachineswithregardtosuppliedtotherotorandAlternatingCurrenttheira
3、pplicationsinindustrialdrives.Thispaper(A.C.)flowsinthestator.Ontheotherhand,abringstothefore,varioustypesofelectricalD.C.machineisamachinethatisexcitedfrommachines,theiroperations,andapplications,asD.C.sourcesonlyorthatitselfactsasasourcewellasthemethodofdeterminingtheirofD.C.[5].
4、Itisacommonpracticeinindustrytoparameters.VariouswaysofprotectingelectricemployA.C.motorswhenevertheyaremachinesagainstoverloadsandmechanicalinherentlysuitableorcanbegivenappropriatefaultsarealsohighlighted.Itisanticipatedthatcharacteristicsbymeansofpowerelectronicstheworkpresented
5、inthispaperwillbeofdevices.Yet,theincreasingcomplexityofimmensebenefittopracticingengineersindustrialprocessesdemandsgreaterflexibilityespeciallyinareasofmachinedesign,fromelectricalmachinesintermsofspecialmaintenance,andprotection.characteristicsandspeedcontrol.Itisinthisfieldthat
6、theD.C.machines,fedfromtheA.C.(Keywords:electricalmachines,operationdesign,supplythroughrectifiers,aremakingtheirmark.maintenance,protection,stator)Inthispaper,weshalldiscussthevarioustypesofelectricmachines,thereafter,weshalllookatINTRODUCTIONthebasicfeaturesandprinciplesofoperati
7、onofelectricmachines.DeterminationofmachineTheDirectCurrent(D.C.)machine,theparameters,basicprotections,maintenance,andsynchronousmachine,andtheinductionelectricmachineapplicationsarealsodiscussed.machinearethemajorelectromechanicalconversiondevicesinindustry[1].Themeritsofthesquir
8、relcageinductionmachineare
