Usha 8801e Sewing Machine Price In Chennai

AN IMPROVED SERVO CONTROL SYSTEM FOR SEWING MACHINE

Thispaperpresentsa permanentmagnetsynchronousmotor(PMSM)servodrivesystemforhighspeedflatindustrialsewingmachine.Inordertosatisfythespecialfunctionofsewingmachine,severalapproachesareappliedinthisservosystem:Usingvoltagefeed-forwarddecouplingcontrolincurrentlooptoimprovespeedandpositioncontrolperformance;Variablegaincontrolisadoptedinsystemtocompensateincompletedecouplingcausedbydisturbanceandinaccuracyofparameter;PMSMusedinsystemisspeciallydesignedwithconcentratedwindingandleanchargemagnetismbarrel-drainrotor,whichcaneffectuallyimprovemotoroperatingandreducetorqueharmonics.Theexperimentalcurvesofsewingprocedureshowthat:thespeedfeedbackcanaccuratelytrackspeedreferenceunderdifferentsewingconditions,whichprooftheservocontrolsystemmeetpurposeofindustrialsewingmachineswell

Industrialsewingmachinesaremainequipmentingarmentindustry,whichhasalargenumber.Today’sscienceandtechnologychangewitheverypassingday.Inordertoachievehighperformanceandenergy-saving,nowadaysmoredesignerstendtodriveindustrialsewingmachinesbyPMSMservosystems[3,6].PMSMdriveshavebeenusedashighperformancevariablespeedsystemsinmanyindustrialapplicationsbecausethosemotorshaveseveralinherentadvantages,suchasruggedconstruction,easyformaintenance,highefficiency,hightorquetocurrentratio,lowinertia,andhighpowerfactor[1,2,7].Thispaperproposesanimprovedservosystemforhighspeedflatindustrialsewingmachines.Theservosystemcangethighperformancetorquecontrolofspecial-designedhighefficiencyraremetalPMSM.Modularizedsewingfunctionssoftwareonthissystemcanrealizehigh-precisionneedlestopposition,threadcut,threadshift,sewingcount,footraise-press,automaticthreadtrimmer,reverse-feedandpresserfootlift,etc.ofsewequipment.Sewingmachineswiththoseservosystemsareapplicablefordifferentmaterials,alsowiththeiradvancednoise-decreasingmotorsanddrivers,theycanremainreliabilityanddurabilityat thehighspeedof5000r/min

AN IMPROVED SERVO CONTROL SYSTEM FOR SEWING MACHINE

Current control loop AVoltageFeed-forwardDecouplingControlmethodisusedincurrentloop.SinceanACservocurrentloopisalwaysinastateoftransition,thetargetofcurrentcontrolisaccuratelytrackingACcurrentamplitudeandvaryingfrequencyaccompanyingspeedvariety,whosefailwillcauseseriouslydistortioninoutputcurrentwaveandbadtorqueperformanceduetosteady-stateerroranddelayincurrentloop.Asdescribedinthispaper,coordinatetransformationandcompensationoperationareemployedbyusingDSPchiptoachievevoltagefeed-forwarddecouplingcontrol.Intermoftheseoperations,torquecurrentandexcitingcurrentarecompletelydecomposed,toachievethequickandaccuratecontrolofcurrentandimprovedynamicspeedbehaviour.SincemostofthePMSMdrivesystemsinindustrialapplicationsarecontrolledwithproportionalintegral(PI)andproportionalintegralderivative(PID)controllers.Nowadaysthereexistsa growingdemandtooptimallysetthePIandPIDparametersinrealtimeaccordingtothevaryingoperationconditionstoobtainbettercontrolperformance.Ina sewingmachinetheloadvariesrapidlywith differentmaterialsinawidespeedrange,soinoursystema variablegaincontrolisusedincurrentcontrolloop.Benefitedfromadvantageoffulldigitalcontrol,thevariablegaincontrolisadoptedinsystemtocompensateincompletedecouplingcausedbydisturbanceandinaccuracyofparameter.Inthelastdecade,a lotofstudieshavebeenmadeintheareaofgainself-tuningcontrolinordertoimprovetheperformanceoftraditionalPIandPIDcontrollers.Roughlyspeaking,therearetwogroupofthoughtstoautotunethePIandPIDgainssothatthecontrollerscanbeadoptedforthevaryingconditions:modelbasedanalyticalmethodandmodel-freemethod[4].Inoursystema model-freemethodisused:inhigh-speedperiod,currentregulationgainwillincreaseautomaticallytoreducesteady-stateerrorofcurrentcontrol.Atlowspeed,especiallynearzerospeed,currentregulationgainwilldecreaseautomaticallytoreducecurrentripplesandshiftbearingvibration[4,5].Thismethodcaneffectivelyreducesystemtorqueripplesandnois https://www.vssewingmachine.in/

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