Optimal design considerations for a linear actuator with active magnetic01665644

Optimal design considerations for a linear actuator with active magnetic01665644

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Unformatted text preview: Optimaldesignconsiderationsforalinearactoatorwithactivemagneticstispension LARD Dick Optimaldesignconsiderationsfor a linear actuator withactive magnetic suspension A.V.Lebedev,E.A.Lomonova,A.J.A.Vandenput D.A.H.Laro EINDHOVEN UNIVERSITYOF DELFT UNIVERSITYOF TECHNOLOGY TECHNOLOGY P.O.Box513- 5600 MB Mekelweg2,2628CD Eindhoven,TheNetherlands Delft,TheNetherlands Tel.:+31/(40)- 247.35.71 Tel.:+31/(15)-278.31.42 Fax:+31/(40)- 243.43.64 Fax:+31 / (15)- 278.93.87 E-Mail: E-Mail:d.a.h.1aroZ)wbmt.tude1ft.n U R L : U R L : Acknowledgements Theauthors are gratefultoDutch"TechnologiestichtingSTW" forgrantingtheproject on "SixDegree-of- Freedom Contactless Slide System" and acknowledge the valuable support (with soft magnetic composites)fromtheHoganasAB,Sweden. Keywords Actuator,Design,Lineardrive,Magneticdevice,Modelling Abstract The paper describesthedetailedanalysisthat encompasses themagnetostaticdesignmethodologyofa linearelectromechanicalactuator.Theactuatoritselfisa complexelectromechanical system combining featuresoftheactivemagneticbearing(suspended mass intheorderof0.3kg)andthelinearLorentz actuator (longstrokerange- 50mm). Thebasicdesignconsiderations are describedandthetasksofthe magnetostaticdesignare defined.Theanalysisandselectionofthemagneticmaterialsare carriedout.A parametricsearchwithrespecttomaindesignvariablesisperformed.Ithashighlightedseveralpeculiar featuresoftheactuatorperformance,suchas a stronglongstrokepositiondependenceofthesuspension forceand a cross-couplingbetweenthesuspensionandthepropulsiondirections.A designprocedure leadstomodificationsindimensionsandcoilsarrangement. Theinitialandtheimprovedprototypes are compared on thebasis ofthe finiteelement method (FEM) modeling and themeasurement results, showingsignificantimprovementsinperformance. Introduction The actuator consistsoftwo permanent magnets, two U-shaped cores and a mover (rotorbar).Four additionalfluxguidingironblocksare usedtoconnectthe permanentmagnets andtheU-shaped cores. Two suspensionandfourpropulsioncoils are placedon theU-shapedcores inordertocontrolthe x- and z-positions ofthemover. The threedimensional schematic layout oftheactuatoris presented in Fig. 1. ThedetaileddescriptionoftheIU-shapedactuatorconceptandprinciplesofitsoperationcan befoundin [1]. TheactuatorexploitsthereluctanceandtheLorenzforcesforcorrespondinglysuspensionandpropulsion principles.The permanent magnets create a biasmagneticfluxthroughthe mover, causingitsunstable levitationduetotheEamshaw's theorem [1].The suspensioncoilsdistortthefluxdensitydistribution, EPE 2005 Dresden P.1 Optimaldesign considerationsforaEnearactuatorwithactive magneticsuspension LARO Dick EPE2005- Dresden ISBN:90-75815-08-5 P.1 Optimaldesignconsiderationsforalinearactoatorwithactivemagneticstispension LARDDick introducingthedifferenceinthevaluesofthefluxdensityintheairgaps aboveandbelowthemover....
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This note was uploaded on 05/08/2011 for the course MECHANICAL 203 taught by Professor Krishna during the Spring '11 term at Akademia Ekonomiczna w Poznaniu.

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Optimal design considerations for a linear actuator with active magnetic01665644

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