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1、IN-WHEELELECTRICMOTORSThePackagingandIntegrationChallengesAlexanderFraserSeniorMechanicalSystemsEngineerProteanElectricLtd,UKABSTRACTOneofthefundamentaladvantagesofin-wheelmotorsisthattheyfreeuppackagingspaceonthevehicleplatform.Fromretrofitstonewvehicledesigns
2、,thefreedomtoaddbatteries,rangeextenders,orsimplypreservecargoandpassengerspaceisamajorcompetitiveadvantageforallstylesofin-wheelmotorovermoreconventionalelectricalmachines.Thisadvantageneedstobepreservedbynothavingtore-locatethefrictionbraketoapositiononthespr
3、ungmassofthevehicle,sobothmotorsandbrakesmustbeaccommodatedinsidethewheelsofavehicle.Topreserveasmuchoftheretrofitmarketaspossible,itmustbeensuredthatthepackagingsolutioninsidethewheeldoesnotrequiresignificantplatformtear-up.Inaddition,thewholesystemmustbesafe,
4、reliable,andprovidecrediblevehicleperformance.Thishasledtosomeradicallydifferentin-wheelmotorconceptsbeingdevelopedbyvariousorganisationsaroundtheworld.Protean'suniquesolutiontothispackagingproblemwas,onthefaceofit,aboldoneforastart-upcompany;displacethebraketo
5、providespaceforamotor,anddevelopanewpackagingphilosophyfortheunsprungassemblyincorporatingbothbrakeandmotor.Byworkingwithanexpertpartneronthebrakingside,this,webelieve,resultsinamuchmoreharmonioususeofthevaluablespaceinsidethewheelthanotherin-wheelsolutions,and
6、meetsorexceedsalltherequirementsoutlinedabove.ThispresentationwillprovidedetailsoftheprocessthatresultedintheProteandesign,aswellashighlighttheengineeringofthesolutionfittedtothefrontaxleofthehighperformanceProtean/BrabusE-Classvehicle.Figure1:Unsprungassembly,
7、Protean/BrabusE-classfront-leftcorner.TARGETMARKETSANDREQUIREMENTSOVERVIEWProteanElectricistargetingbothpassengervehiclesandlightcommercialswithablanksheetelectricmotordesignwhollydedicatedtoin-wheelapplications.Principally,themotormustbecapableofbeingthesoleso
8、urceoftractivepowerforanelectricvehicleorserieshybrid,butmustalsoworkalongsideconventionalinternalcombustionpowertrainstoenableparallelhybridarchitectures.Tokeepcostsdown,2W