创新型9相轴向磁通永磁电机：无稀土、高效率、高功率、低成本——无稀土革命

Innovative 9-Phase Axial Flux PM Motor withoutRareEarthforHighEfficiency,PowerandLowCost TheRare-Earth-FreeRevolution Ferrstron's Breakthrough Solution Aworld'sfirstProtected by IP RareEarthFreeAxial-FluxMotorsUltracompactwith98%efficiency UsesFerriteMaqnetsCommonly availableandverycheap ImprovedPerformancePowerSpeedandRange ProprietaryLogicMulti-DimensionalFlux Control SoftwareinChip Ferrstron's Innovation 4 Areas of efficiency 4 Areas of efficiency Zone 1 - Low RPM, Low Torgue CoggingTorqueisgivenbythevariationinW (magnetic energyof the machine)Losses are high due to high cogging torque in Rare Earth basedwithrespecttorotorangle Primaryreasonforhigh loss-CoggingTorque motors, since they have a very high variation in magnetic energywithrespecttorotorangle High cogging torque leads to high current required to overcomethis torque, thus leading to high copper losses in motor and highconduction losses in controller, in comparison to the mechanicalpoweroutput inthiszone Common strategies to reduce cogging torque are - slot skewing,tapering,asymmetricaldesign,fractional slotwindings,etc.However,thesestrategiesendupreducingtorquedensityofthemotor,thus requiring more current and thus high losses. Ferrstronhasnovelapproachtoreducethevariationinmagneticenergywithrespecttorotoranglebyacombinationofdesignstrategies inmotorarchitecture,geometryandplacement,thusreducingcoggingtorque Zone 2 - Low RPM, High Torque HighCopperLossesaremainlydueto Primaryreasonforhighloss Highphaseresistance(oftenresultingfromlargeendwindings as a result of distributed winding)Asthetemperatureofcopper increases.Itfurtherincreasescopperlossduetoincreaseinresistance.Normalcoolingmethodsrelyonheatextractionfromcooling jackets in motor casing,which leads to highcoppertemperature High Copper Losses (both AC and DC)High Cogging Torque-leadingto increased currentrequirementThe above two factors further increase the copper loss inmotor as well as conduction loss in controller High cogging torque is explained in the previous slide Ferrstron isabletoreducecopperlossesbyusing distributed winding,still havinga sinusoidal waveform with its novelapproachtogeometryandplacementUsingnovelwindingtechniquetoachievedirectin-coil coolingthusextractingheatdirectlyfromthesource Zone 3 - Medium RPM and Torgue HighCopper Losses aremainlyduetoHigh phase resistance (often resulting from large end windings as a result of Primary reason forhigh loss distributed winding)High flux weakening component of current (d-axis current)-particularlyhigh for rare earth magnets-based motorsLeakagefluxpath crossing windinglocationsleading to increaseinACcopperlosses High Copper Losses (both AC and DC)Highlron lossesBothcopperand ironlosses inmotorleadto increasedcurrent requirement further increasing the copper loss inmotor as well as conduction loss in controller HighlronlossesaremainlyduetoThe high magnetic field, particularly seen in rare-earth magnets based moto Manymodels existto estimate ironlosses but allof them indicatelossesareproportional to the square of magnetic field intensity. PFo = Physt + Pee + PexeChyst J B2 + Cee J2 B2 + Cexe J1s B1.5 Ferrstron isabletoreducecopper losses asexplainedinthepreviousslide Ferrstronisabletoreduceironlossesbymaximizingfluxwhilelimitingpeaksofmagneticfieldoscillations-thisisdoneoptimizingairgap interaction area as well as control algorithm FERRSTRON Zone 4 - High RPM Eddy Current Loss inthemagnet is givenby: PrimaryreasonforhighlossEddyCurrentLossesinMagnets Rare EarthMagnets sufferfrom very high eddy current losses atWhere,K.istheEddyCurrentConstantofthematerial,andisinverselyproportional tothe resistivity of themagnet material, ordirectlyproportional to material conductivity hiqhRPMs And B.is thefluctuation in the magnetic field insidethe magnet,during onecycle FormotorswithrareearthmagnetsbothK,andBmarehigh IncaseofFerrstron,sinceweuseFerriteMagnetswhichhavezero'conductivity,theeddycurrentlossesinmagnetsarezeroevenatveryhighspeeds Electromagnetic Simulation.Stack Vehicle Integration Simulation Efficiency diagrams compared Motorefficiency Motor+Controllerefficiency Driving cycle & Efficiency diagram Driving cycle results Driving cycle & Efficiency diagram Driving cycle results Driving cycle & Efficiency diagram Driving cycle results Driving cycle results Major implications Using Ferrite instead of Rare-earth magnets : StronglyreducesthecostofamotorRawmaterialsavailableworldwide:Makesyoulessdependentongeopolitical issues,supplychainsandchangingprices Energyefficiencyindailydrivingconditionsgenerates: SignificantlyincreaseddrivingrangeBettercustomersatisfaction Achievements InvestorBacked ByAlumnifromllTsatKharagpur,Mumbai,KanpurByIndustrialists,CorporateLeaders InterestfromGlobal&IndianCustomers PowertrainTestedinDemoVehicles ExtensiveR&DCapabilityDeveloped Achievements My 3 take-aways for today Designfocused on efficiency in real world driving Uniquedesign:9-PhaseAxia