变频器的控制模式 VF,矢量控制

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1、MotorControlModesVariableFrequencyDrivesPUBLICPUBLICCopyright©2016RockwellAutomation,Inc.AllRightsReserved.BasicControlTypesVolts/HertzControlFluxVectorControl(FVC)(V/Hz)SensorlessVectorControlFieldOrientedControl(FVC/FOC)(SVC)PUBLICCopyright©2016RockwellAutomation,Inc.AllRightsReserved

2、.PWMACDriveBlockDiagramPowerConversionUnit(PWM)ThisfigureshowsablockdiagramofthepowerconversionunitinaPWMdrive.Inthistypeofdrive,adiodebridgerectifierprovidestheintermediateDCcircuitvoltage.IntheintermediateDCcircuit,theDCvoltageisfilteredinaLClow-passfilter.Outputfrequencyandvoltageisc

3、ontrolledelectronicallybycontrollingthewidthofthepulsesofvoltagetothemotor.PUBLICCopyright©2016RockwellAutomation,Inc.AllRightsReserved.MotorCurrent.FluxProducingComponent-IdTorqueProducingComponent-IqTotalCurrent(FLA)-ItIdSowhatistherelationship?Load122It=Id+IqItIqLoad2ItPUBLICCopyr

4、ight©2016RockwellAutomation,Inc.All4RightsReserved.Volts/HertzControlVolts/HertzcontrolisabasiccontrolmethodRequirestheleastsetupVariesthevoltageandfrequencyattheoutputofthedriveMainlyusedforfanandpumpapplicationsMostcommonlyusedmotorcontrolmodePUBLICCopyright©2016RockwellAutomatio

5、n,Inc.AllRightsReserved.V/HzCurveDrivemaintainsalinearrelationshipbetweenVoltage&Frequency460Vac/60Hz=7.667V/Hz230Vac/60Hz=3.833V/HzPUBLIC.Copyright©2016RockwellAutomation,Inc.AllRightsReserved.6V/HzCurveCustomV/HzorPump/FancurvePUBLIC.Copyright©2016RockwellAutomation,Inc.AllRightsRes

6、erved.7V/HZControlPUBLICCopyright©2016RockwellAutomation,Inc.AllRightsReserved.V/HzControl-TorqueVsSpeedOneissuewithV/HzControlispoortorqueatlowspeedsPerUnitTorquePUBLIC.Copyright©2016RockwellAutomation,Inc.AllRightsReserved.9SensorlessVectorSensorlessVectordoes…usestheV/Hzcoreprovid

7、esbetterbreakawaytorquethanV/HzprovidesbettertorquethroughoutthespeedrangethanV/HzrequiresanautotuneproceduretobeperformedonthemotorSensorlessVectordoesnot…requireafeedbackdeviceregulatetorqueregulatespeedPUBLICCopyright©2016RockwellAutomation,Inc.All10RightsReserved.Sens