开关磁阻电机功率电路的设计和保护

开关磁阻电机功率电路的强弱电保护是开关磁阻电机调速系统中的重要组成部分。通过对三相不对称半桥型功率变换器主电路进行分析,设计了开关磁阻电机调速系统过电流、过/欠电压、电力电子部件驱动掉电保护、功率电路看门狗保护等电路,自动判断功率电路过压、过流等故障,并产生相应措施来保护电机。实践证明,该系统能够在恶劣环境中保持长期可靠运行。     

三相12-8结构开关磁阻电动机的控制设计

本文以控制系统P89LPC932A1单片机为核心,实现了开关磁阻电机调速系统数字化控制的设计,重点分析了控制系统的软件,实验表明该调速系统具有良好的性能.     

基于神经网络的开关磁阻电机建模

基于神经网络具有很好的非线性逼近能力,利用RBF网络,其函数取高斯函数,在分析测量数据和开关磁阻电机非线性磁特性的基础上,建立了开关磁阻电机的模型.通过与样机实测数据比较,验证了模型的有效性.同时更为突出的优点是使得系统的运行特性对参数的扰动有很强的鲁棒性,从而使系统获得更高的调速性能.     

基于逆系统方法的磁悬浮开关磁阻电机悬浮系统的解耦设计

磁悬浮开关磁阻电机是一个具有强耦合、非线性、多变量的复杂系统,为更有效地对其进行解耦控制,提出了一种基于逆系统方法的磁悬浮开关磁阻电机悬浮系统的解耦设计,建立了磁悬浮开关磁阻电机悬浮系统的状态方程,并对解耦系统的性能进行了仿真比较,结果表明,通过逆系统解耦,磁悬浮开关磁阻电机悬浮系统在径向两个垂直自由度上有效实现了解耦和独立控制。     

应用开关磁阻电机激励参数控制转矩脉动仿真

针对开关磁阻电机转矩脉动控制问题,以六相12/10开关磁阻电机为例,根据相电感、相电流、转子位置相互关系,建立非线性简化数学模型。采用关断角模糊补偿控制减小转矩脉动,由关断角滞后带来的输出转矩减小问题,采用开通角自调整控制,设计开通角自调整控制器,优化相电流,提高平均转矩输出。应用MATLAB构建开关磁阻电机控制系统仿真模型,得到开通角自调整与关断角模糊补偿仿真波形,仿真实验表明转矩脉动减小,平均输出转矩增大,采用的控制策略是可行的,为实际开关磁阻电机调速控制系统的设计提供了有效的方法。     

开关磁阻电机定子凸极对振动特性的影响研究

振动、噪声是开关型磁阻电动机调速系统较突出的问题和研究难点,为了深入了解SR电机定子凸极对其振动特性的影响,以有限元分析软件ANSYS为工具,建立研究SR电机定子凸极振动特性的2D、3D有限元分析模型,研究SR电机定子凸极对其固有频率和振动模态的影响。     

通用型电机数字控制实验平台

基于DSP研制了一套通用型电机数字控制实验系统。该平台以DSPTMS320F28335为控制核心,集成了电源模块、液晶显示、功率变换器主电路、驱动电路、隔离电路等功能模块。利用6个半桥组成电机控制系统通用主电路,可完成有刷/无刷直流电机、开关磁阻电机、永磁同步电机、单相/三相异步电机和步进电机等多种电机的调速实验。综合了电力电子技术、电机学、微特电机、电机拖动以及DSP控制等相关专业知识,有助于学生深入学习和理解不同电机的控制原理以及数字调速控制方法。     

开关磁阻电机的噪声及其抑制

本文对近几年出现的开关磁阻电机(SR电机)的噪声来源进行了分析，并提出了降噪的具体措施。     

开关磁阻轮毂电机冲片的设计

在内转子电机的基础上,进一步阐述了外转子开关磁阻轮毂电机冲片的设计方法,并对其进行理论推导。给出了冲片参数的选取思路。通过一个250W外转子开关磁阻电机设计实例,初步验证了该方法的有效性。     

基于通用性软件的车载开关磁阻电机仿真实验方法

在创新性本科教学中,讲解电动汽车驱动用开关磁阻电机时,需要一种合适的仿真实验方法。从通用性与实时动态性出发,提出了一种结合两种软件的车载开关磁阻电机仿真方法,来代替硬件实验设施。利用MagNet软件提供的瞬态场有限元计算实现对车载开关磁阻电机的非线性建模,利用该软件的插件将其建模结果融入到Simulink库里,利用Simulink搭建包含了BP神经网络、模糊开关角、转矩分配函数法等复杂控制算法的转速、电流双闭环控制仿真电路,该仿真电路的输出作为动态激励,施加到车载开关磁阻电机的有限元求解域,再利用MagNet计算该动态激励下的瞬态场,得到该车载开关磁阻电机的仿真结果。这些仿真结果经过了实验证明是合理可靠的。因此,由软件实现的该仿真实验方法可以作为讲解与操作电动汽车驱动用开关磁阻电机的教学工具,安装在实验室电脑内,节省教学成本。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

胡主席在印度,我却在中国

Today, Sunday morning, I sit thinking and typing at my computer. My thoughts are in my homeland, India and my body is in China. The body is here and mind there for a good reason. Mr. Hu is president and I am resident and both are in each other's countries (what a difference the absence of one small letter makes!). Mr. Hu will return in a few days and I will stay on longer.     

STORIES

正A One day a pig went to the stable(马棚)to see his good friend,an oldhorse,and was going to stay there forthenight.Night came and it was time forsleep.The pig went into the straw heap(稻草堆)and lay comfortably.A longtime passed,but the horse was stillstanding there and did not move.Thepig asked the horse why he did not go tosleep."Standing like this is the begin-ning ofsleeping,"answered the horse.     

巧妙引语(英文)

正1.Any fool can count the seeds in an apple.Only God can count all the apples in one seed.2.Happy families are all alike;every unhappy family is unhappy in its own way.3.Memories are the key not to the past,but to the future.4.Sometimes in the dark you see what you want to see.5.There is a great difference between     

Information for Authors

正Scope and Policy The Journal of Chongqing University-English Edition(JCQU-E)is a peerreviewed journal publishing research articles in multiple disciplines of science and technology,covering civil and environmental engineering,chemical engineering,biotechnology,mechanical and electrical engineering,computer and data processing,mining,metallurgy,materials science,and interdisciplines thereof.