转向架牵引电机安装座损伤分析及其处理措施

笔者所在公司在动车组转向架检修过程中,发现某个转向架构架牵引电机安装座表面存在异常损伤。文章简要介绍了该动车组转向架牵引电机安装座特殊损伤的情况,并针对该损伤产生的几种可能原因如牵引电机电击、材料缺陷、电化学腐蚀等进行了详细的分析,同时为避免该种损伤的发生,制定了相应的措施,并提出了具体修复检修的方法。     

动车组牵引电机温度过高故障浅析

动车组牵引电机温度过高对运营安全可靠有很大影响,为保证动车组安全可靠运行,有效降低故障率,动车组牵引电机温度升高超过限值时将限速运行,影响运营秩序。文章对导致牵引电机温度过高的故障原因进行了分析,并提出了整改和维护措施,以保证动车组安全可靠运行。     

动车组牵引电机短路环超声相控阵检测工艺分析

在动车组牵引电机设备运行过程中,发生在转子导条技术组件,或者是短路环技术组件的断裂问题,是诱导牵引电传动技术系统运行过程丧失基本技术作用的主要原因。借由针对短路环技术组件的焊接处理工艺流程展开分析,选择超声相控阵检测技术工艺,针对发生技术失效的区域展开检测技术工艺设计,且在上述工作流程中,借由运用仿真模拟方法,以及参考试块试验方法验证确定检测技术工艺的可靠性和适用性,能够为实际开展的动车组电机失效检测工作提供工艺流程设计基本思路。文章围绕动车组牵引电机短路环超声相控阵检测工艺,展开简要的阐释分析。     

我国更高速电力机车牵引系统核心技术获突破

中国南车株洲电机有限公司2011年12月28日宣布，自主研制的高性能牵引电机、牵引变压器成功装备了刚刚下线的中国更高速度等级动车组，新系统在安全节能与功率等级方面取得突破。     

中国标准动车组“核心动力”通过线路高速试验

<正>2015年11月25日从中国中车株洲电机有限公司获悉,搭载该公司研制的核心动力——牵引电机和牵引变压器的中国标准动车组,日前在太原大西铁路客运专线顺利通过线路阶段性高速试验。这意味着拥有完全自主知识产权的中国高铁驱动技术迈出了关键一步。据介绍,在条件复杂的阳曲-原平区间综合试验跑车过程中,中国标准动车组跑出了每小时385 km的试验速度,其牵引     

马来西亚动车组联轴节组装工艺研究

文章针对马来西亚动车组项目电机侧联轴节驰缓问题进行了分析,提出了解决驰缓问题的组装工艺方法。     

Matlab/Simulink环境下异步电机定子故障诊断的仿真与研究

针对定子电流谐波分量法对异步电动机进行定子故障诊断,难以得到明显电流故障特征分量的问题.本文中根据具体故障情况下定子绕组的接线,通过数学分析推导出发生故障时定子端电压,建立了在两相静止坐标系下故障电机的模型,并使用定子电流谐波分量法对滤去工频谐波分量之后的故障定子电流进行分析来诊断电机是否发生定子故障.对仿真结果进行分析,使用定子电流谐波分量法可以检测到明显的故障特征谐波分量,准确的诊断出异步电机的定子故障.该方法对实际电机定子故障诊断的研究有一定参考价值和实际意义.     

高压电机常见故障的现场检修方法探索和研究

高压电机是各行各业生产中一个必不可少的设备,高压电机的类型是多种多样的,判别标准也不同,一般情况下,通用型高压鼠笼式三相异步电机的使用范围是最为广泛的。高压电机的需要基于电磁感应基础上运行,在技术条件、高电磁因素、运行条件、外部环境等因素的影响下,电机会产生各种类型的机械故障与电气故障。在以往,电机发生故障后,除了轴承在现场进行更换,其他部件都是送至修理厂进行维修,不仅花费高,也会浪费大量的时间。本文主要探索高压电机常见故障的现场检修方法。     

磁钢槽加工刀具及工艺改进

电机转子磁钢槽与磁钢的配合尺寸是制造稀土永磁电机的关键尺寸,因为磁钢槽与磁钢配合太宽松将造成严重漏磁现象,使电机的电气性能指标达不到要求,如果电机采用过裕量设计方案来补偿漏磁损失,又会增加昂贵的磁钢用量以及使电机结构尺寸增大,从而增加企业的制造成本;可是,太紧配合又会增加磁钢的装配难度,而且在磁钢压入磁钢槽装配过程中容易产生磁钢破损、碎裂以至无法装配等问题.     

磁钢槽加工刀具及工艺改进

电机转子磁钢槽与磁钢的配合尺寸是制造稀土永磁电机的关键尺寸,因为磁钢槽与磁钢配合太宽松将造成严重漏磁现象,使电机的电气性能指标达不到要求,如果电机采用过裕量设计方案来补偿漏磁损失,又会增加昂贵的磁钢用量以及使电机结构尺寸增大,从而增加企业的制造成本;可是,太紧配合又会增加磁钢的装配难度,而且在磁钢压入磁钢槽装配过程中容易产生磁钢破损、碎裂以至无法装配等问题.……     

CRH3C型高速动车组DC110V接地故障的分析及排除

文章介绍了DC110 V接地故障对动车组的影响,阐述了DC110 V供电系统和它的负载分配情况,总结了DC110V接地的检测方法,重点论述如何利用这些检测方法及时发现处理CRH3C型高速动车组DC110 V接地故障,对于提高铁路运输质量安全具有重大意义。     

基于动态事件调度仿真的高速铁路动车组运用计划计算机协同编制方法的研究

依据动车组运用的牵引动力与载客装置不可分离的原则,动车组挂运接续和列车运行线的时点是一致的,因此将这些时点作为变量,考虑动车组整备维修、动车组站段折返接续作业时间、列车运行线铺画约束、列车挂运匹配等条件,建立以动车组运用效率和列车运行计划均衡性为指标的基本模型,采用动态事件表调度方法实现可行方案编制,研究站间固定区段运用模式下,单基地多车种的动车组运用计划与成对列车运行计划协同编制问题。最后以京津客运专线实际条件模拟编制动车运用计划,以验证模型与算法的可行性。     

高速铁路牵引站外部电源接入设计相关问题的研究

文章介绍了高速铁路牵引站供电形式及牵引供电负荷的特点对电网造成的影响,并结合广西境内的相关高铁工程,提出了接入牵引站线路的变电站的继电保护、电能计量及电能质量的配置原则和需要注意的问题。     

高速铁路综合接地施工工艺

综合接地系统是将铁路沿线的牵引供电回流系统、电力供电系统、信号系统、通信及其他电子信息系统、建筑物、道床、站台、桥梁、隧道、声屏障等需接地的装置通过贯通地线连成一体的接地系统。现就高速铁路综合接地的施工工艺进行简要分析。     

EMU and Labour: Facing up to the Euro

EMU is the historic issue facing the Labour Government. In this article, David Currie considers the prospects for EMU and the challenges that it poses for the Government, particularly in the light of the forthcoming UK Presidency. He also considers the implications and risks of the Chancellor's recent statement on EMU.     

成绵乐城际铁路旅客列车开行方案探讨

如何制定一个经济合理的旅客列车开行方案,是铁路运输部门急需解决的首要问题。通过对成绵乐城际铁路的客流分析,在预测2012年客运量的基础上,对旅客列车开行方案进行探讨,主要包括动车组的运用、列车运行速度、列车开行对数、动车组停站方案和动车组在站技术作业时间等。     

Some perspectives on currency relations between EMU and Central and East European EU accession countries

Central and East European prospective EU members are natural candidates for a subsequent admission to the European Monetary Union (EMU). This poses questions on (a) the optimal EMU accession time for Central European EU aspirants, and (b) the optimal exchange rate system in preparing for EMU accession. This paper discusses related issues and introduces four special issue papers on the subject.     

The Impact of Shocks on the UK Economy in and Out of EMU

Entry to EMU at an inappropriate exchange rate could trigger a full-blown business cycle in the UK. Once inside EMU, the UK's response to a number of different economic shocks would change — partly because of the fixed exchange rate, and partly because of the common monetary policy. In particular, when an asymmetric shock occurs — one that hits the UK harder than other Eurozone economies — the UK response is generally likely to be more pronounced inside EMU than outside. We find that that result still applies even in a reformed EMU — one in which the ECB and the labour market are reformed to bring them closer to the Anglo–Saxon model.     

The impact of EMU on bond yield convergence: Evidence from a time-varying dynamic factor model

This paper examines the dynamics of long term sovereign bond yields for 21 OECD countries. Following Del Negro and Otrok (2008), we estimate a dynamic factor model, with time varying parameters and stochastic volatility, that decomposes the observed variation in bond yields for each country into a common factor, a regional factor (EMU/non-EMU), and an idiosyncratic country specific factor. We find that prior to the financial crisis of 2008, the common factor played a dominant role for most countries in our sample. In the post financial crisis period there is substantial heterogeneity in the relative importance of the EMU and the idiosyncratic factors across different countries. For instance, our results suggest that there was a decoupling between the EMU and bond markets of the periphery economies of Greece, Ireland and Portugal in the post-2008 period. We find that after the onset of sovereign debt crises in these economies, the idiosyncratic factor assumed an important role in driving the bond yield variation. Thereafter, the EMU’s share in bond yield changes in Ireland and Portugal increased considerably since 2012, whereas for Greece the idiosyncratic factor continued to play a significant role in driving bond yields. In contrast, the EMU factor consistently played a dominant role in explaining bond yield changes in Italy and Spain, the other two economies that also experienced severe debt crisis during this period. We argue such differences in the importance of the EMU factor between core and periphery economies can be attributed to the systemic importance of core members for the EMU. This is indicated by our finding that bond yields and credit default swap (CDS) are less sensitive to changes in debt-GDP ratios in countries where the EMU factor played a larger role in the post-2008 period.     

Internal and external transmissions of monetary and fiscal policies in the EMU

With the introduction of Economic and Monetary Union (EMU), the sovereignty of national monetary institutions has been replaced by a common monetary institution, the European Central Bank (ECB) and national currencies have been replaced by a common currency, the euro. EMU therefore implies the loss of national monetary policy autonomy and internal exchange rate flexibility inside the EMU area. However, external exchange rate adjustment, i.e. adjustment of the euro exchange rate, remains a feasible adjustment mechanism. This paper analyses how internal and external exchange rate flexibility affect macroeconomic adjustment in EMU and non-EMU countries. To do so, a model is constructed in which three countries interact: two countries that decide to form a monetary union and a third country that does not participate in the monetary union. Numerical simulations of a representative example are used to characterise the adjustment dynamics induced by monetary and fiscal policies before and after the start of the EMU.