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  • HybridElectricVehicles& RegenerativeBraking

    Cooltechnology?Ormarketingtool?

    KenStanton,PhD

    EngineeringEducation

    Dept.ofMechanicalEngineering

  • HowdoeshybridizationimproveMPG?

    Downsizeengine&runinmoreefficientzones

    Electricmotortorque&efficiency

    Aerodynamics(notuniquetohybrids,though)

    Pluginforelectricpowerrecharge

    Regenerativebraking

  • Sowhatisregenerativebraking?

    IsitaspecialtechnologyaddedtoHEVs?

    Orisitjustamarketingtool?

  • Howelectricmotorswork

    Forceinoppositedirections,aroundarotationalobject, createstorque

    Forceisfrom2magneticfieldsinteracting

    Canbe2magnets,1magnet&1coil,or2coils

    Permanentmagnetscantbecontrolled

    Butweneedtocontrolanelectricmotors

    torque&speed

    CoilscanactlikemagnetsANDarecontrollable

    Directionandmagnitudeofelectricitydeterminesmagneticfield

    directionandmagnitude

  • Howelectricmotorswork

    Electricalenergy>Mechanicalenergy(rotational)

    Also

    Mechanicalenergy>Electricalenergy

  • FluxLinkage

    Fluxlinkage

    =BdS=BA

    =NBAformultipleturns

    =BAforuniformfield

    =N

    =NBAcos

    mostcompleteequation

    Also,

    =Li

    forcoilflowingcurrent

  • BackEMF

  • Bringitalltogether

    Vehicleisinmotion>kineticenergy

    Wheelsrotatewithvehicle>rotationalenergy

    Wheelsrotateelectricmotor

    Motorrotationinducescurrentincoils>electricalenergy

    Inductioncreatesopposingtorque>braking

    Currentisrectified(toDC)andsenttobatteries>stored electricalenergy(inchemicalform)

    =RegenerativeBraking

  • Controllingregenerativebrakingforce

  • Inconclusion

    Regenerativebrakingisjustapropertyofelectric motors

    Benefits:

    Reducesuseofmechanicalbrakes(wasteheat,materials)

    Doesntrequireextraequipment

    Recoverskineticenergy

    Rechargesbatteries

  • KenStanton,PhD ResearchScientist MechanicalEngineering ColoradoStateUniversity Ken.Stanton@colostate.edu

    Questions?

    Hybrid-Electric Vehicles & Regenerative BrakingHow does hybridization improve MPG?So what is regenerative braking? How electric motors workSlide Number 5How electric motors workSlide Number 7Flux LinkageBack EMFBring it all togetherSlide Number 11Controlling regenerative braking forceIn conclusionKen Stanton, PhDResearch ScientistMechanical EngineeringColorado State UniversityKen.Stanton@colostate.edu

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