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1、3020IEEETRANSACTIONSONMAGNETICS,VOL.49,NO.6,JUNE2013ElectromagneticPerformanceofNovelVariableFluxReluctanceMachinesWithDC-FieldCoilinStatorX.LiuandZ.Q.Zhu,Fellow,IEEEDepartmentofElectronicandElectricalEngineering,UniversityofSheffield,SheffieldS13JD,U.K.Inthispaper,novelvariable
2、fluxreluctancemachines(VFRMs)withdifferentrotorpolenumbers,whichemployadoublysalientstructuretogetherwithfieldwindingsidenticallylocatedinthestatorforeachphase,areinvestigatedandcompared.Differentfromotherdoublysalientmachines,suchasswitchedreluctancemachines(SRM)anddoublyfeddou
3、blysalientmachines(DFDSM),theequationfordeterminingthestator/rotorpolenumbers,i.e.,,isnolongerlimitedinVFRMs.Morefeasibleselectionsofrotorpolenumberscanbeusedifthestator/rotorpolenumberscansatisfy.Thus,fora6-statorpolemachinenotonlytherotorpolenumbercanbeselectedasevennumbers,
4、suchas4-and8-rotorpoles,whicharecommonlyusedforSRMandDFDSM,butoddnumbers,suchas5-and7-rotorpoles,arealsofeasible.Thebenefitsofusing5-and7-rotorpolesarethecancellationofeven-orderharmonicstogetherwiththethird-orderharmonicintheflux-linkageandback-EMF.Hence,moresinusoidalback-EMFc
5、anbeobtainedtoproducealowertorqueripple.Thecancellationin5-and7-rotorpolemachinesisbecausethefluxgeneratedbyfieldandarmaturewindingscanpassthroughtheadjacentstatorpolestoformashorterfluxpath,whichcanfurtherincreasetheiraveragetorque.Tovalidatetheanalysis,fourprototypemachineswith
6、differentrotorpolenumbersaremanufacturedandtested.IndexTerms—Hybridexcitation,rotorpolenumber,switchedreluctancemachine,variablefluxreluctancemachine,vibration.I.INTRODUCTIONamongthetopologiesforadjustingthefieldfluxdensity,therobustdoublysalientstructurewithfieldwindingsonthestat
7、orHECONCEPTofvariablefluxwasdevelopedtoeasetheissimpleandcandissipatetheheateasily.ComparedwithPMTfluxweakeningandimprovetheefficiencyofpermanentmachines,similartootherdcexcitedmachines,theproposedmagnet(PM)machinesathighspeed.DuetounchangeablePMmachineexhibitslowertorquedensity,
8、butithastheadvantagesfluxinPMmachines,toextendthespeedintheflux
