ExercisesforSubjectEnglishMay31,2006
Academicterminologies1线性定常控制系统印刷电路板可编程控制器智能功率模块集成电路三相全桥可控硅整流电路有功功率局部放电
Academicterminologies2同步电动机气体绝缘开关额定负载自耦变压器热电耦中性点频域分析强迫换流
Academicterminologies3继电器三极管功率因数逆变器运算放大器断路器传感器电动机
Academicterminologies4数据总线磁场电阻逻辑运算短路整流器万用表全双工通信
ReadingComprehension1Thearmaturewindingisdepictedasacoilwrappedaroundatoroid.Thisismerelyaschematicconvenience.Inanactualwinding,noconductorsarewastedbyplacingthemontheinnersurfaceoftherotorcorewherenofluxpenetrates.Thosepartsofthearmaturewindingwhichliedirectlybelowthebrushwidthareassumedtohavetheinsulationremoved,i.e.,thecopperisexposed.Thisallowscurrenttobeconductedtoandfromthearmaturewindingthroughthebrushastherotorrevolves.Inapracticalwindingeachcoilismadeaccessibletothebrushesbyconnectingthecoilstoindividualcommutatorsegmentsandthenplacingthebrushesonthecommutator.
ReadingComprehension2Abstract:Oneofthemostfrequentlyappliedmethodsofsensorlessrotorfluxorientedcontrolofinductionmachinesreliesonutilizationofmodelreferenceadaptivecontrol(MRAC)basedspeedestimation.Accuracyofthisspeedestimationschemeheavilydependsoncorrectsettingoftheparameterswithintheestimatorandthecontroller.Thepaperdealswithindirectfeed-forwardrotorfluxorientedinductionmachinedriveinwhichspeedestimationisperformedutilizingrotorfluxbasedMRACscheme.Astudyisconductedinordertoevaluatespeedestimationerrorduringtransientoperationofthedrive,causedbyincorrectsettingand/orvariationofparameters.Incorrectsettingofthemagnetizinginductance,statorresistancevariationandrotorresistancevariationareanalyzedbysimulation.Simulationprocedureisdescribedandcomparativeanalysisoftransientbehaviorunderdifferentdetuningconditionsisperformed.