A Novel Permanent Magnet Motor with Doubly Salient Structure

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1、ANovelPermanentMagnetMotorwithDoublySalientStructureYuefengLiao,FengLiangandThomasA.Lip0DepartmentofElectricalandComputerEngineeringUniversityofWisconsin-Madison1415JohnsonDriveMadison,WI53706-1691Abstract-Anewtypeofdoublysalientmachinetanceisreachingitsmaximum,inordertopreventdrawingispresentedinw

2、hichthefieldexcitationispro-energyfromthemechanicalsystem(i.e.producingnegativevidedbynon-rotatingPermanentMagnet.Thistorque).Theproblemwiththislimitationliesinthelargedoublysalientpermanentmagnet(DSPM)motoristurn-offinductance,whichpreventsthecurrentfromshowntobekindredtosquarewaveformperma-droppi

3、ngquickly.ThisproblemofcurrentcommutationnentmagnetbrushlessDC(PM-BLDC)motors.associatedwithalargeturn-offinductancegreatlydecreasesLinearandnonlinearanalysishasbeenmadetoinvestigatethecharacteristicsofthisnewtypeofthetorqueproductioncapabilityoftheVRMfedbyanon-PMmotor.AprototypeDSPMmotorisdesigned

4、idealpowerconverterwithfiniteKVA.Thisfeaturecanbeandcomparisonmadebetweenthisnewtypeofviewedasanadditionalpenaltytothe“excitationpenalty”motorandtheinductionmotor.Itisshownthatnormallyimposedonallelectricallyexcitedmachines,byfullyexploitingmodernhighenergyPMmate-particularlyforsmallmachines.Theexc

5、itationpenaltyrialandthedoublysalientstructure,theDSPMrelatestothefactthatthephasesofelectricallyexcitedmotorcanoffersuperiorperformanceoverexis-machinesmustnotonlycarrythetorqueproducingtingmotorsintermsofefficiency,torqueden-componentofcurrentbutmustalsosupporttheexcitationsity,torque-to-currentr

6、atio,torque-to-inertiacomponentwhichservestomagnetizethemachine.Asaratioetc.whileretainingasimplestructureamen-result,boththemachinewindingsandthepowerconverterabletoautomaticmanufacture.areusuallyhighlystressedfromthepointofviewofvoltageandcurrent,resultingintheneedforanincreasedI.INTRODUCTIONVAra

7、tingforthedrive.Also,theairgapoftheVRMmustbesubstantiallyreducedcomparedtoothercompetingTheVariableReluctanceMotor(VRM)employingamachinestohelppushthemachineintothehighlydoublysalientstructurehasbeenthefocu