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1、数控电气驱动器设计基础作业数控电气驱动器设计基础作业专业班级：船舶电子电气工程（2）班姓名：指导教师：薛征宇大连海事大学轮机工程学院二O一四年十二月solicitedopinionsandsuggestionsArticle265,including:fourproblemsto171.Deepeningspecialregulation,StatelineStatemodified,sidechecksidemodified,totalsolutionhighlightproblem19a;torectificationspiritcarr
2、iedoutpartypoliticallife,in-depthcarriedouthearttalk,seriouscarriedoutcriticismandself-critical;putbuiltchapterStatebusinessthroughoutactivitiesalways,fullcleanupandestablishedperfectainvolved"fourwind"aspectsofsystemprovides,new12items,amendmentperfect15items,abolition3ite
3、ms.Througheducationalpractices,"fourwinds"problemsignificantlycurb,partymembersandcadres'apparentchangeofconsciousnessandabilityofservingthemassesincreasedsignificantly.(C)topromotethesustainedandhealthydevelopmentofeconomyandsociety.Adheretothe"party-ledtownship,prospering
4、Township,eco-village,projectspromotingTownshipandindustrialTownship,industry-richTownship,harmonyTownship,stabilizationcontrol"developmentstrategy,takeeconomicconstructionastheCenter,strengthenleadershipovertheeconomicworkinearnest,closelyaroundthetargetdeterminedearlierthi
5、syeartodealwithandtrytoresolvethevariousadversefactors,paycloseattentiontothework.Effortstopromotingtheconstructionofmajorprojects.Totransportation,waterconservancy,urbaninfrastructureconstruction,focusingonimplementationofanumberofindustrialstructureadjustmentandoptimizati
6、onandupgradingofkeyprojectsforleadingroles;CompletedhasXXvillagepassvillageHighway,andtownshiplocationlightsbrightof,andXXmeters"beautifulvillage",andtownshippublicrentalandXianghospitalspublicrental,and270setsruralhousingroom船舶电子电气工程（2）班7数控电气驱动器设计基础作业摘要电力电子器件第二章对应作业题44．请详细
7、回答电力电子器件都有哪些？它们的符号是什么？它们的导通条件是什么？它们的主要参数是什么？它们在主电路里应用的优缺点是什么？电力电子器件主要可分为三大类，全控型器件，半控型器件，不可控器件。不可控器件：电力二极管。电气符号为：导通条件：主要依据了电导调制效应，PN结上流过的正向电流较小时，二极管的电阻主要是作为基片的低掺杂N区的欧姆，电阻，阻值较高；PN结上流过的正向电流较大时，注入并积累在低掺杂N区的空穴载流子浓度将很大，电阻率明显下降。故也就是说当流过电力二极管的电流达到一定的值时，二极管才会导通。主要参数：正向平均电流IF(AV)即是：工
8、频正弦半波电流的平均值；正向压降UF:在指定温度下，流过某一指定的稳态正向电流时对应的正向压降。反向重复峰值电压URRM:对电力二极管所能重复施加的反向最高峰值电压
