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1、ApplicationBriefMoving-CoilLoudspeakersAmoving-coilloudspeakeristhemostcommontypeofloudspeaker,alsocalledan(electro)dynamicloudspeaker.Thedeviceisanelectro-acoustictransducerthatconsistsofavoicecoilthatmovesinasteadymagneticАeldtoproducethesoundinresponsetoelectricalaud
2、iosignalinput.ANSYSMaxwellsoftwarecanbeusedtoeЏectivelyanalyzevariousimportantdesignaspectsofmoving-coilloudspeakers.KeywordsMoving-coilloudspeaker,electrodynamicloudspeaker,voicecoil,magneticАeld,АniteelementanalysisProductsUsedANSYS®Maxwell®16.0,ANSYSOptimetrics™Backg
3、roundIncontrasttoothertypesofloudspeakers(suchaspiezoelectric,electrostaticormagnetostrictive),moving-coilloudspeakersworkontheLorentzforceprinciple.Accordingtothisprinciple,theforceactsonacurrent-carryingcoilofwireinamagneticАeld.Inamoving-coilloudspeaker,themagneticАe
4、ldisalmostalwaysgeneratedbypermanentmagnets.Themovingcoil(orvoicecoil)isattachedtoacone,whichisconnectedtoarigidbasket(frame)throughaǯexiblesuspensioncalledthespider.Thespiderrestrictscoilmovementtoaxialdirectioninsideacylindricalmagneticgap.Bydrivingacurrentthroughthev
5、oicecoil,amechanicalforceisgenerated,whichmovesthecoilaswellastheattachedcone,therebyreproducingsoundunderthecontroloftheappliedelectricalsignalcomingfromtheampliАer.Individualtransducers(calleddrivers)areusedtoreproducediЏerentfrequencyranges.Toadequatelyreproduceawide
6、rangeoffrequencies,mostloudspeakersystemsemploymorethanonedriver(subwoofer,woofer,mid-rangedriver,tweeter),particularlyforhighersoundpressurelevels.Description1Moving-CoilLoudspeakersVariousimportantdesigncharacteristicsofmoving-coilloudspeakerscanbeeasilypredictedbythe
7、ANSYSMaxwellelectromagneticАeldsimulator.Theseincludeǯuxmodulation,BL-factor,lossesandimpedanceofaloudspeaker.Asthesedevicesfeaturemostlyrotationalsymmetry,theyaretypicallyanalyzedusinga2-Daxisymmetricalsolver.Figure1showsatypicalmagnetassemblyofamoving-coilloudspeakert
8、ogetherwiththemagneticǯuxlinesplot,withthez-axisbeingtheaxisofrotationalsymmetry.Thetopplate,bottomplateandcen
