椭圆形基管H形翅片管的开发和应用

针对传统烟气冷却器存在烟阻大、积灰和磨损等问题,开发了一种椭圆形基管H形翅片管烟气冷却器。风洞模拟试验和流场分析表明:椭圆形基管的烟气冷却器烟速低,阻力小,流线平滑,积灰和磨损减轻。实际运行结果验证了该型烟气冷却器是可行的。     

一种啮合式电机结构设计与转矩分析

针对机器人等对驱动设备有空间限制的应用场合,提出了一种三相齿轮啮合式电动机结构。分析了电机的运行原理和磁场特性,给出了控制方式;推导了转矩计算方法。为提高分析精确性,采用Ansoft Maxwell有限元磁场分析软件计算了电机转子在不同工作区域的静态转矩。计算结果表明该电机具有低转速、大扭矩特点。该电机集成了减速机构,缩短了传动链,结构紧凑,有着较好的应用前景。     

塑封电机的发展及其关键技术

塑封电机具有效率高、体积小、重量轻、噪声低及适合大规模生产等特点，应用广泛。文中介绍塑封电机在国内外的发展、应用状况及其关键技术，指出塑封电机在我国发展前景广阔。     

带空/水冷却器直流电机的设计

１ 概述 带空／水冷却器的直流电机是随着现代化工业的高速发展应运而生的。某些行业设备的运行环境和工况,要求电机不仅要具有良好的运行性能,还要有较高的电机外壳防护等级,并且安装使用方便。为此我们根据市场的需求,在强风型Ｚ４系列直流电机的基础上开发了ＺＫＳＬ系列带空／水冷却器亘流电机。它的同中心高出力可达到或接近外鼓风机电机水平．而电机外壳防护等级则可达ＩＰ４４（封闭式）。适用于冶金、橡胶等行业多尘埃,有水汽等条件恶劣的环境。２ 三种封闭式直流电机的特点 现有的封闭式中小型直流电机按冷却方式区分（不包括…     

微型交流力矩电动机机械特性速度调节与控制

本文主要介绍微型交流力矩电动机的基本特点、调节方法及其应用。负载变化时,电机转矩、转速随之改变。电机从空载转速到堵转均能平滑稳定地运行。该电机转子电阻大、堵转电流小,所以可长期运行在大转矩低转速或堵转的工作状态下。文章最后介绍了调节方法。     

冷却器非正常运行传热能力的分析与计算

本文根据汽轮电机冷却器的４种不同分布型式，提出了冷却器在非正常运行时负荷能力的计算方法，通过地优化６００ＭＷ、３００ＭＷ和４７ＭＷ汽轮发电机冷却器的计算与应用，说明本方法可满足设计和用户的要求，此外，本方法还适用于采用密闭循环通风系统的大型水轮发电机及交、直流电机。它填补了冷却器性能计算中的一个缺项。     

采用空气冷却器的电机运行特性

提出了电机空气冷却器的运行特性这个新的概念，给出了运行特性的具体计算公式，并分析了影响运行特性的因素。     

多级电机同步驱动控制系统

本文对多电机同步调速控制的特点进行了分析,提出了对多级独立电机及多级柔性连接电机同步驱动的速度补偿、电流补偿方案。介绍了用此同步控制技术在钢厂边铸机、彩显管生产线以及邮政包裹分拣机等多电机同步驱动系统中的应用。     

高效传热管在电力生产中的推广及应用

文章介绍了高效传热管典型产品高翅片管、低翅片管、双面强化管、横纹管的特点及其在电力生产中的应用,并通过试验数据,着重讨论了已在一些大电厂得到成功应用的高翅片传热管、低翅片传热管的优良换热性能及良好的生产经济效益,为热力发电厂今后的设备选型提供了参考。     

设附加齿的永磁无刷直流电动机

针对小型永磁无刷直流电动机，其电压低、电流大的特点，论述了如何有效地利用电枢绕组大电流产生的电构磁势，使之产生显著的助磁效果，本文介绍了设置附加齿，充分利用电枢磁势的原理，在此基础上研制了一台钕铁硼永磁无刷直流电动机，给出了电机结构图以及电机绕组驱动电流、驱动电压的理想波形，实验测电机绕组驱动电压波形和电机性能参数，分析电压波形中反电势部分，得到了令人满意的结果，即电枢绕组反电势随电枢电流的增大明     

新型叠片热交换器的实验研究及其在大,中型电机中的应用

考虑到大、中型电机上现行铜丝绕簧式热交换器的诸多缺点,对新型叠片热交换器进行了实验研究。本文介绍了这种新型热交换器的特点和参数。它最突出的优点是散热面大、重量轻。在加热风洞内对该种热交换器的传热系数.阻力压降等进行了系统的实验。给出了风洞试验装置和传热系数、风阻压降与风速的关系曲线。进行了真机实测,分析了片距对散热面、传热系数和风速的影响。用表格列出了新旧热交换器的使用结果。     

Dry сoolers and air-condensing units (Review)

The analysis of factors affecting the growth of shortage of freshwater is performed. The state and dynamics of the global market of dry coolers used at electric power plants are investigated. Substantial increase in number and maximum capacity of air-cooled condensers, which have been put into operation in the world in recent years, are noted. The key reasons facilitating the choice of developers of the dry coolers, in particular the independence of the location of thermal power plant from water sources, are enumerated. The main steam turbine heat removal schemes using air cooling are considered, their comparison of thermal efficiency is assessed, and the change of three important parameters, such as surface area of heat transfer, condensate pump flow, and pressure losses in the steam exhaust system, are estimated. It is shown that the most effective is the scheme of direct steam condensation in the heat-exchange tubes, but other schemes also have certain advantages. The air-cooling efficiency may be enhanced much more by using an air-cooling hybrid system: a combination of dry and wet cooling. The basic applied constructive solutions are shown: the arrangement of heat-exchange modules and the types of fans. The optimal mounting design of a fully shopassembled cooling system for heat-exchange modules is represented. Different types of heat-exchange tubes ribbing that take into account the operational features of cooling systems are shown. Heat transfer coefficients of the plants from different manufacturers are compared, and the main reasons for its decline are named. When using evaporative air cooling, it is possible to improve the efficiency of air-cooling units. The factors affecting the faultless performance of dry coolers (DC) and air-condensing units (ACU) and the ways of their elimination are described. A high velocity wind forcing reduces the efficiency of cooling systems and creates preconditions for the development of wind-driven devices. It is noted that global trends have a significant influence on the application of dry coolers in Russia, in view of the fact that some TPP have a surface condensers arrangement. The reasons that these systems are currently less efficient than the direct steam condensation in an air-cooled condenser are explained. It is shown that, in some cases, it is more reasonable to use mixing-type condensers in combination with a dry cooler. Measures for a full import substitution of steam exhaust heat removal systems are mentioned.     

用合拼程序设计电机

利用系列电机的特点和拥有一定数量的电机设计单的资源,编制了设计电机方案的合拼程序。揭示了系列电机派生规格设计的规律,就是只要电机的核心部分相同,不论电机参数各异、冷却方式不同,它们都可能是同一电机并可使用同一电机设计单。     

Building Motors that Last

Air-cooled heat exchangers (ACHEs) are commonly used in the manufacturing processes of petrochemical facilities. These coolers are typically driven by electric motors placed in locations that make regular maintenance and inspection very difficult. The effects of weather, stresses caused by belt loading, and adjustable speed drive (ASD) operation add to the severity of this application. All these factors combine to form an operating environment that will dramatically shorten the life of stock electric motors. This article will explore the ACHE application as well as the modifications that can be made to a driving motor that will ensure prolonged operation.     

计算机辅助电机优化设计系统

许多最优化直接搜索法如模式搜索法、鲍威尔的共轭方向法、单纯形法、复合形法和随机搜索法等都曾用作电机的最优化设计。与其它方法相比，随机搜索法不必用罚函数或围墙函数，不会过早地陷入局部最优解，可以说是最简单有铲和最适合于电机优化设计的方法。本文详尽地讲述了随机搜索法的基本概念及其算法，应用这个算法，完成了一套“电机ＣＡＤ优化设计系统”；本文介绍了这个软件包系统，并给出了在几种电机设计中应用结果。结果表     

熔渗法AgW（75）触头材料研究

电触头作为电器设备的关键元件之一,既是载流体,又是机械零部件,要求具有良好的导电导热性、耐电孤烧损、抗熔焊、低而稳定的接触电阻、有一定的强度和易于机械加工等。本研究采用粉末冶金熔渗技术制备AgW（75）电触头材料,对其进行复压、复烧,并测量了其力学物理性能和显微组织。结果表明,粉末冶金熔渗技术与复压复烧相结合制备的AgW（75）触头材料的相对密度高,硬度达到国家标准要求,但材料收缩性大。     

New International Electrotechnical Commission standards for regulating acoustic noise and vibration of electric machines

The results of a comparative analysis of the new International Electrotechnical Commission (IEC) standards for regulating the normative values of noise and vibration of electric machines and national standards valid in the territory of the Russian Federation are presented in this article. The most essential advantages and disadvantages of new IEC standards have been specified. Principal problems that domestic developers and electric machines manufacturers may experience due to the planned transition from local to new IEC standards have been considered.     

交流励磁电机发展前景

随着电力电子技术与数字控制技术的发展,交流励磁电机应运而生。它有优于同步电机的性能。文章分析了交流励磁电机在不同工业领域的发展前景及所要解决的问题。     

无传感器电机位置检测策略综述

针对装置直接位置传感器的电机结构复杂、价格昂贵、可靠性低的弱点 ,间接位置传感器技术将成为今后电机控制技术发展的必然趋势。本文综述了有关无传感器电机的位置检测策略     

对中小型电机行业现状的分析意见

文章分析了我国中小型电机的行业现状及目前存在的问题,对照欧美市场和产品状况,指出我国未来几年中小型电机的市场走向及重点开发的产品.