lecture7-analytical design method vs fea analysis讲座设计与分析方法.pdf

Classicalelectricalmachinedesign

Analyticalmachinedesignformulasdevelopedovertheyearshavebeen

usedelectricmachinedesign.

Thesuccessofthisdesignmethodhasbeenvalidatedandimprovedby

calibrationadjustmentsfromactualmachinetesting.

Certainparameterscausingaccuracydifficultieshavebeenaddressedby

famousengineerswhodevelopedapproximationsolutionmethodsbased

upontestresults.

Examples:EquivalentCircuit(AlgerSpeedmethods)

(Plusothers)Endwindingleakagereactance(Alger,RichterPostnikov)

Leakagereactancesaturation(Norman)

DeepBareffects(Boldea)

circuitfluxdensitiesassumedtobeuniformineachcrosssection

usingclassicalanalyticalmethods.Doesnotaccountforpathlength.

Usingclassicalanalyticalequationsrequiresleakagefluxorarmature

reactancefluxlinkagereductionvaluesbeestimatedormeasured.

Mod7Copyright:JRHendershot201261

Analyticalcalculationsusingclassicfieldequations

Analyticalmethodsusingclassicicfieldequationsforcalculatingthe

icfluxmagnitudeanddistributionwithintheiccircuitcanonly

beestimated.Leakageandtheeffectsinchangesinmaterialpermeabilitydue

tofluxdensitiescannotbeaccountedforusingclassicfieldequations.

Howeverthesedesignmethodsareveryusefulbecausetheyarefastandre-

iterativesolutionscanberapid.Thisprocessisusedforinitialdesignsand

sizingofmachines.Overtheyearschartsoftypicaldataforaveragecurrent

densitiesaveragecircuitfluxdensitiesareavailabletospeedupthisprocess.

Expertdesignershavedevelopedandvalidatedspecialsolutionmethodsas

mentionedearlier.

TheseclassicfieldequationsarealsousedwithallFEAsolversforpost

proce