The free-piston linear generator - potential and chellenges

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1、DEVELOPMENTALTeRnATiveDRivesTHEFREE-PISTONLINEARGENERATORPOTENTIALSANDCHALLENGESTheGermanAerospaceCenter(DLR)exploresafree-pistonlineargenerator(FPLG)withgasspring.ForthefirsttimeanFPLGoverallsystemwasputintooperationrecentlyandprovidedtheproofofconcept.AnFPLGcanbeappliedasrangeextenderin

2、automotivepowertrain.38AUTHORsCONCEPTOFTHEFREE-PISTONLINEARGENERATORThebasicstructureoftheFPLGasimplementedbytheDLR,❶(a),consistsofthesubsystemscombustionunit,lineargeneratorandgasspring.InthecombusDIPL.-ING.FLORIANKOCKtionunitheatisreleasedbyatwostrokeisProjectManagerFPLGattheinternalcom

3、bustioncycle,sothepistoninstituteofvehicleConcepts,unitperformsalinearmovement.OntheGermanAerospaceCenter(DLR)oppositesidethereisanotherpistonwithinstuttgart(Germany).anadjacentairfilledcompressionchamber,whichisunfiredandthereforeactsasagasspring.Theextractionofenergyfromthesystemisperfo

4、rmedbythelineargenerator.Itisformedbyamoverholdingpermanentmagnetsandwindingsfixedinthehousing(stator).DIPL.-ING.ALEXHERONisResearchAssociateattheThearrangementselectedbytheDLRinstituteofvehicleConcepts,distinguishesitselffrommostfreepistonGermanAerospaceCenter(DLR)projectsinthepastbytheg

5、asspring[1].instuttgart(Germany).Firstly,thisinnovativeapproachhasbeenchoseninordertobeabletovarythestrokeandsecondlythisdesignallowsforeasierpistonmotioncontrol.Basedonthedescribedarrangementwithonepistonunit(consistingofcombustionandgasspringpistonandtheDR.-ING.FRANKRINDERKNECHTlinearge

6、neratorrotor)afurthermirrorisHeadofDepartmentAlternativeenergyConvertersatthesymmetricunitiscompulsoryforuseininstituteofvehicleConcepts,vehicles.ThesetupallowsforacompenGermanAerospaceCenter(DLR)sationofallthemovingmassesthroughinstuttgart(Germany).mirroredsynchronousoperation.Thereforea

7、lownoiselevelandcalmoperationcanbeachieved.Furthermorevariousdifferentembodimentsarepossible.Theyaredividedintothecategoryofsinglecombustionchambersystems,①(a),andthecategoryofcentralcombustionPROF.DR.-ING.chambersystems,①(b,c).HORST E. FRIEDRICHisDirectoroftheinsti