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DCMachineImplementseparatelyexcitedDCmachine(continuousanddiscreteblocks)LibraryMachinesDescriptionTheDCMachineblockandtheDiscreteDCMachineblock(alsointheMachineslibrary)bothimplementaseparatelyexcitedDCmachine.TheDCMachineblockimplementsacontinuousmodel,andtheDiscreteDCMachineblockimplementsadiscretemodel.Thefollowingdescriptionappliestobothblocks.Anaccessisprovidedtothefieldterminals(F+,F-)sothatthemachinemodelcanbeusedasashunt-connectedoraseries-connectedDCmachine.ThetorqueappliedtotheshaftisprovidedattheSimulinkinputTL.Thearmaturecircuit(A+,A-)consistsofaninductorLaandresistorRainserieswithacounter-electromotiveforce(CEMF)E.TheCEMFisproportionaltothemachinespeed.E=Ke*w.KEisthevoltageconstantandωisthemachinespeed.InaseparatelyexcitedDCmachinemodel,thevoltageconstantKEisproportionaltothefieldcurrentIf:Ke=Laf*IfwhereLafisthefield-armaturemutualinductance.TheelectromechanicaltorquedevelopedbytheDCmachineisproportionaltothearmaturecurrentIa.Te=Kt*Ia.whereKTisthetorqueconstant.ThesignconventionforTeandTLisThetorqueconstantisequaltothevoltageconstant.ThearmaturecircuitisconnectedbetweentheA+andA-portsoftheDCMachineblock.ItisrepresentedbyaseriesRaLabranchinserieswithaControlledVoltageSourceandaCurrentMeasurementblock.Mechanicalpart:ThefieldcircuitisrepresentedbyanRLcircuit.ItisconnectedbetweentheF+andF-portsoftheDCMachineblock.ThemechanicalpartcomputesthespeedoftheDCmachinefromthenettorqueappliedtotherotor.ThespeedisusedtoimplementtheCEMFvoltageEofthearmaturecircuit.ThemechanicalpartisrepresentedbySimulinkblocksthatimplementtheequationwhereJ=inertia,Bm=viscousfrictioncoefficient,andTf=Coulombfrictiontorque.DialogBoxandParametersPresetModelProvidesasetofpredeterminedelectricalandmechanicalparametersforvariousDCmachineratingsofpower(HP),DCvoltage(V),ratedspeed(rpm),andfieldvoltage(V).Selectoneofthepresetmodelstoloadthecorrespondingelectricalandmechanicalparametersintheentriesofthedialogbox.SelectNoifyoudon'twanttouseapreset
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