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1、Principleofrotarytransformeranditsapplicationinautomaticcontrol（旋转变压器原理及其在自动控制中的应用）PrincipleofrotarytransformeranditsapplicationinautomaticcontrolAbstract:Thispaperintroducestherotarytransformer(theresolver)classification,structurecharacterandworkingprincip
2、leanddecodingmethod,andapplicationinallwalksoflife,andtherelatedindustrialequipment(SMARTCAM)applicationfeatures.Keywords:resolver,SMARTCODER,SMARTCAMResolverRotaryisasignalelementwhoseoutputvoltagevarieswithrotorangle.WhentheexcitationwindinginACvoltageexc
3、itationfrequency,outputvoltageamplitudeandangleofrotorwindingintothesineandcosinefunction,orinarelationshiporinacertainanglerangeandthelinearrelationshipbetweentheangle.Itismainlyusedforcoordinatetransformation,triangulationandangledatatransmission.Itcanals
4、obeusedastwophaseshifterinangledigitalconversiondevice.Accordingtothefunctionrelationshipbetweenoutputvoltageandrotorangle,therearethreemaintypesofrotatingtransformer:1.positivecosineresolver----thefunctionofitsoutputvoltageandrotorangleissinusoidalorcosine
5、function.2.linearresolver----theoutputvoltageislinearlyrelatedtotherotorangle.LinearresolverAccordingtotherotorstructureanddividedintotheimplicitpoleandconvexpoletypeoftwo.3.proportionalresolver----theoutputvoltageisproportionaltotheangleofrotation.Structur
6、edescriptionThecosinerotatingtransformerourcompanyonlysalesTamagawacompany,sotherotarytransformerispositivecosinetype.Therotoriscomposedofarotorandastatorwinding,andthetwoareindependentofeachother.Theprimaryandsecondarycoilsarewoundonthestator.Therotorconsi
7、stsoftwosetsofcoilswithadifferenceof90degrees,usingabrushlessdesign,asshowninfigure1.RotorwindingFigure1Fig.2isanelectricaldiagramoftheresolver.ER1-R2ExcitationvoltageVeES2-S4Figure2Thespecificfunctionrelationshipbetweentheinputandoutputvoltageisshownbelow:
8、Therotorangleistheta,andtheprimarycoilvoltage(i.e.excitationvoltage)isER1-R2=E*Sin2PIftF:excitationfrequency,E:signalamplitudeThentheoutputvoltageisES1-S3=K*E*Sin2PIft*Costheta;ES2-S4=K*E*Sin2PIft*Sint
