搜索
沈阳理工大学学士学位论文I摘要永磁同步电机以其结构简单、效率高、调速范围宽等优点，广泛应用于机械加工、航空航天和电力牵引等领域，而直接转矩控制是继矢量控制技术之后发展起来的一种新型高性能的交流调速技术，因此，永磁同步电机的直接转矩控制系统成为研究的热点。本文以研究高性能的永磁同步电机直接转矩控制系统为目的，具有重要的理论和实际意义。本文结合大量的文献资料，介绍了永磁同步电机的结构、控制策略以及其直接转矩控制的研究现状与方向。从空间矢量原理出发，介绍了调速系统中常涉及到的三种坐标系以及它们之间的变换理论，推导了永磁同步电机在各种坐标系下的数学模型，在此基础上详细地分析了永磁同步电机传统直接转矩控制和基于SVPWM的直接转矩控制系统的原理，并推导了SVPWM算法实现过程。最后，在MATLAB/Simulink环境下对传统的直接转矩控制系统进行仿真研究。关键词：永磁同步电机；直接转矩控制；仿真；空间矢量脉宽调制技术沈阳理工大学学士学位论文IIAbstractPermanentmagnetsynchronousmachinewithitssimplestructure,highefficiency,widespeedrange,arewidelyappliedinmanyfields,suchasmachinework,aerospace,electrictractionetc.,anddirecttorquecontrolisanewtypeofhigh-performanceACdrivingsystemaftervectorcontroltechnique,asaresult,theresearchofdirecttorquecontrolofpermanentmagnetsynchronousmachinehasbecomeafocus.Therefore,thisthesistakestudiesthehigh-performancedirecttorquecontrolsystemofpermanentmagnetsynchronousmachineasagoal;ithasimportanttheoreticalandpracticalsignificance.Afterconsultedmanyliteratures,thethesisintroducedthestructureandcontrolstrategyofpermanentmagnetsynchronousmachine,andthenanalyzedthestatusandtrendofpermanentmagnetsynchronousmachine’sdirecttorquecontrolsystem.Basedonspacevectorprinciple,thethreekindofcoordinatesystemsaswellasthetransformationofthemwhichusuallyusedinmotor’sspeedcontrolsystemareintroduced,then,themathematicmodelsondifferentcoordinatesystemsarederived,bebasedonthat,theprincipleoftraditionaldirecttorquecontrolsystemaswellasthedirecttorquecontrolsystembasedonSVPWMareanalyzeddetailed,meanwhile,therealizationprocessofSVPWMalgorithmisderived.Finally,thesimulationmodelofconvientionalDTCControlsystemareestablishedinMATLAB/Simulink.KeyWords:Permanentmagnetsynchronousmachine;Directtorquecontrol;Simulation;.SpaceVectorPulseWidthModulation沈阳理工大学学士学位论文III目录摘要.............................................................................................................................................IABSTRACT...............................................................................................................................II1绪论.........................................................................................................................................11.1永磁同步电机简介...........................................................................................................11.1.1永磁同步电机的结构与分类..................................................................................11.1.2永磁同步电机的特点..............................................................................................21.1.3永磁同步电机的典型应用......................................................................................21.2永磁同步电机的控制策略.........................................................................................41.2.1永磁同步电机VVVF控制......................................................................................41.2.2永磁同步电机矢量控制..........................................................................................41.2.3永磁同步电机直接转矩控制..................................................................................51.3永磁同步电机直接转矩控制的研究现状和方向..........................................................61.4本文的研究意义和主要工作..........................................................................................82永磁同步电机数学模型分析...............................................................................................102.1空间矢量原理.................................................................................................................102.2坐标变换.........................................................................................................................112.2.1ABC坐标系与αβ坐标系之间的变换.................................................................112.2.2ABC坐标系与dq坐标系之间的变换..................................................................122.2.3αβ坐标系与dq坐标系之间的变换......................................................................142.3永磁同步电机的数学模型.............................................................................................152.3.1ABC坐标系下数学模型.......................................................................................162.3.2dq坐标系下数学模型...........................................................................................162.3.3αβ坐标系下数学模型............................................................................................172.4本章小结.........................................................................................................................183永磁同步电机直接转矩控制系统......................................................................................193.1直接转矩控制的原理.....................................................................................................193.1.1永磁同步电机直接转矩控制的基本思想............................................................193.1.2基于定子电压空间矢量的定子磁链控制............................................................21沈阳理工大学学士学位论文IV3.1.3永磁同步电机直接转矩控制系统的实现............................................................223.2基于SVPWM的直接转矩控制方法..........................................................................