ontroloftwoPMsynchronousmotorsusingasingleinverter.Inthisapproach,thequadraturecurrentofeachmotoriscontrolledwhilethedirectcurrentisuncontrollable.Suchanapproachwasalsoconsideredinthework[].Thisproblemwasmotivatedbythecontrolofelevatordoors.Aconventionalelevatordoorsystemhasthetwodoorsmechanicallyconnectedtoasinglecablewhichforcesthetwodoorstoopenandclosetogetherduetothemechanicalcoupling.Usingpositionsensorfeedbackfromthewall,thepositionofthedoorsisthencontrolledbyamotor/invertersystemthatpushes/pullsonthecable.Theobjectiveherewastoconsideradifferentsystemwherethecablesystemiseliminatedandeachofthetwodoorsoftheelevatorareactuatedusingalinearsynchronousmotor.Thetwomotorsmustreliablyopenandclosethetwodoorsoftheelevatorwhilemaintainingastiffnessinthedifferentialdirectionofmotionontheorderof,N/mtohavethe―feel‖oftheconventionalcabledrivendoors.Forexample,inaconvenm:REQNP=.存在位置差异他不受控制电流id,id。
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