frequencies.Atlowerfrequencies,icfluxincreasesand,thus,izingcurrentresultinginincreasedlosses.Thissystempresentsasimilardynamicresponseastheclosed-loopsystemwithV/fspeedcontrol.Itstransientperformanceislimitedduetooscillationsontorque[32]andthisbehaviorrestrictstheapplicationofthissystemtoprocessesthatonlyrequireslowspeedvariation.Fig.8EfficiencyofcontrolledsystemwithandwithoutPLCperunitofefficiencyofstandardsuppliedmotor.Fig.ontrol.VII.anbeusedinautomatedsystemswithaninductionmotor.uracyinspeedregulationatconstant-speed-variable-loadoperation.TheeffectivenessofthePLC-basedcontrolsoftwareissatisfactoryupto96%ofthesynchronousspeed.paredtotheopen-loopconfigurationoftheinductionmotorfedbyaninverter.Specifically,athighspeedsandloads,theefficiencyofPLC-controlledsystemisincreasedupto10–12%work.
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