德国Loher公司EHSV450LA—04A高压增安型三相异步电动机简介

1概述上海石油化工总厂塑料厂的聚丙烯装置环管泵装有4台增安型高压中型防爆电动机，由德国Loher公司制造，电动机型号为EHSV－450LA—04A，表示意义如下：电动机结构及安装型式为IMB3（按DINIEC34—7），冷却方法为IC0151（按IEC34－6），外壳防护等级为IP55（按IEC34－5），防爆标志为EExel（按ENSO019）。电动机主要技术数据如下：a．额定功率为33OkW；b额定电压为6kV；。额定频率为50HZ；d．额定转速为1493r／min；e．额定功率因数为0·89；f．t。时间：温度组别为TI、TZ时为305，温度组别为T3时为16s。电动机的安装…     

鼠笼型高压厂用动机转子导条断裂原因分析及改进

简要分析了鼠笼型高压厂用电动机转子导条断裂的原因，介绍了部分国内生产家厂采用的新型防导条断裂结构及包头第一热电厂从自身实际出发采取的措施。     

中型高压异步电动机的结构改进设计

本文用数值法和等效热路法地中型高压电机的通风结构进行了研究。结果表明采取适当的措施后，可在中型高压电机采用纯轴向通风结构，和改进前的电机相比，可节省有效材料，减少工时，降低成本。     

Y2系列10kV紧凑型高压三相异步电动机

介绍了Y2系列10 kV紧凑型高压异步电动机的整体结构、通风散热结构、绝缘系统、电磁设计及风扇噪声抑制方法,并与国际先进产品进行了比较.     

Y2系列10kV紧凑型高压三相异步电动机

介绍了Y2系列10 kV紧凑型高压异步电动机的整体结构、通风散热结构、绝缘系统、电磁设计及风扇噪声抑制方法,并与国际先进产品进行了比较。     

手车式高压电动机真空接触器控制柜

手车式高压电动机真空接触器控制柜福建龙岩矿务局林兆水余姚矿用电器厂诸伯良１前言手车式高压电动机真空接触器控制柜（ＧＣＫＹ－１－１７型），是为龙岩矿务局红一煤矿井下中央变电所６ｋＶ配电系统设计的，因其结构紧凑、占地小、密封防尘、防滴、防溅、维修方便，在...     

防止高压电动机定子绕组损坏的几点体会

本文针对电动机损坏的部位和损坏的时间,分析了电机损坏的原因,采取了相应的防震、防潮、防尘的措施,在绝缘结构和工艺上进行了改进,取得了明显的效果,延长了电动机的使用寿命。所采取的措施有一定的经济价值。     

给水泵电动机转子的事故及处理

近年来我国火力发电厂所使用的磨煤机、风机、给水泵、排粉机等旋转机械的高压电动机，经常发生鼠笼转子断条事故，给电厂安全生产带来一定影响。我厂给水泵电动机为原苏联所产３１５０ｋＷ，２极，６０００Ｖ电动机，由于随着累计开停机次数的增多、本身结构及制造欠缺等...     

笼型高压感应电动机转子断条故障的技术处理

一种意大利ITALIANO制造厂生产的高压感应电动机采用笼型单笼转子结构,笼条采用铜排,两端各伸出铁心近150 mm长度,转子铁心两端短路铜环呈斜锥体结构,环壁厚50 mm,近铁心端面与各笼条端部截面铜焊焊接.多出转子铁心两端的各铜排端部形成"排热风扇",对转子进行自冷散热.转子轴伸侧转轴装有金属风扇.     

高压电动机故障原因分析及防止对策

本文根据我厂５０台高压时机的故障统计，从设计制造工艺、振动、过电压、运行和检修维护等方面分析了高压电动机发生故障的原因，并提出了具体的防范措施。     

Ultrasonic motors: Their models, drives, controls and applications

In the last decades piezoelectrically driven ultrasonic motors have become alternative actuators to the conventional electromagnetic motors especially for precise and accurate servo positioning applications. Different types of ultrasonic motors have been constructed and manufactured. Several drive systems have been designed, implemented and proposed for these motors. A variety of control techniques have been applied to them. The research given in this study covers bases of the ultrasonic motors. Theoretical background, modeling, drive systems, control techniques and applications of the ultrasonic motors have been introduced. Firstly, the general overview has been given. Then, modeling studies focused on performance estimation and analysis of ultrasonic motors have been examined. Afterwards, drive systems and control techniques of ultrasonic motors have been investigated. Furthermore, an example drive and control system has been presented. This drive system has been designed as to be controlled digitally. In addition, the important industrial and research applications of these motors have been included. The presented study has been arranged as a review of ultrasonic motors. The important points of specifications, models, drive systems and control methods of the ultrasonic motors have been emphasized.     

与直流电动机同类型的自控式同步电动机

自控式电动机专指有直流励磁磁极的一种电机.从动态转速的观点,审视同步电动机和直流电动机的两种不同构建模式,它们的区别在于是否允许转子角速度相对于电枢磁动势角速度有所变动,以及由此呈现的不同基本特征.指出自控式的交流电动机是具有箝位效应的直流电动机的新发展.从交流电枢的视角探讨直流电动机原理有助于为工程实践提供有益的启示.     

一种小容量异步电机有功损耗的快速估算方法

三相异步电机空载有功损耗是异步电机比较重要的性能指标之一。在三相异步电机运行效率分析的基础上,提出了三相异步电机空载有功损耗的估算方法,并分析了其在不同异步电机空载视在功率中的占比,对开展异步电机相关的工作具有一定的现实指导意义。     

感应电动机的综合方法研究

传统的感应电动机综合方法以容量为加权因子进行综合计算。根据电磁�滑差特性曲线的特点,提出了改进的感应电动机分组方法。根据感应电动机的参数对感应电动机的加权因子进行修正,提出了改进的感应电动机综合方法。仿真计算结果表明,与传统方法相比,上述感应电动机的分组方法和综合方法可以提高负荷模型中感应电动机的计算精度。     

步进电动机国内外近期发展展望

步进电动机是一种将数字脉冲信号转换成机械角位移或者线位移的数模转换元件。在经历了一个大的发展阶段后，目前其发展趋于平缓。然而，由于步进电动机的工作原理和其它电动机有很大的差别，具有其它电动机所没有的特性。因此，它仍然能根据市场的需求，沿着小型、高效、低价的方向发展。     

Peculiarities of controlling switch-inductor motors

An analysis of the results of methods of controlling switch-induction motors are described. Switch-induction motors were shown to be motors with alternating, a priori unknown parameters. Control of these motors using microprocessor systems and digital sensors leads to time delays that result in brake torques and decreasing power characteristics of motors that limit the torque at high rotating frequencies. Ways and methods of solving this problem are determined.     

Scaling Effects of Inverter-Induced Bearing Currents in AC Machines

In this survey paper, we show by straightforward mathematical scaling considerations that small inverter-fed ac motors of up to typical 20 kW at 1500/min are likely to suffer from discharge (electric discharge machining) bearing currents, whereas larger motors are likely to be subjected to high-frequency (HF) circulating bearing currents. When comparing motors that operate at the same voltage level, the resulting bearing-current density is high for very small and very large motors. Smaller values occur in between these two extremes with medium size motors in the range of 10-100 kW. Therefore, electric bearing insulation is useful for larger motors to interrupt the HF circulating bearing-current path, whereas small motors need rotor shielding, common-mode voltage filters, or hybrid bearings.     

两个不同结构六相永磁同步电机串联驱动系统

由于多相电机较以前传统的三相电机优点明显,因此越来越受到关注.其优点之一就是多台多相电机可以进行串联,并且串联的多台电机由一台电压源型逆变器供电,减少了逆变器支路数量,使设备的体积大大减小.系统由一台对称六相永磁同步电机(PMSM)和一台夹角为0°的六相PMSM组成,两台电机的定子绕组按照一定的方式联接,运用矢量控制技术使两电机解耦,两电机实现独立控制.从电机的结构入手,分析两电机原理及串联规则,并建立两电机串联的数学模型,最后确定串联驱动系统的动态解耦性.     

Three-phase electromagnetic AC motors

Advanced three-phase electromagnetic ac motors based on electromagnetic gate-inductor motors are proposed. The concept of development and the constructive scheme of a three-phase electromagnetic ac motor are given. Advantages of the proposed motors compared to asynchronous motors are shown.     

Proper application of motors operated on adjustable frequencycontrol

Most high-efficiency motors can withstand the rigors of adjustable speed drive (ASD) operation. However, there are significant differences between applications of motors operated on sinewave power and motors operated on adjustable frequency controls (AFCs). This is an ongoing subject, rapidly changing due to advances in the technology of the AFCs. Subsequently, many of the older problems associated with the application of motors on AFCs have been solved, while at the same time, new problems were introduced. In many cases, high-efficiency, low-voltage motors can be applied on AFCs with no or little modification. In order to do this successfully, however, basic motor operating principles and the affect of applying a motor on an AFC need to be understood. The proper application of a motor for use on an ASD is dependent on an understanding of: thermal motor limitation-from AFC harmonics and reduced-speed operation at constant load (i.e., constant torque); and upper-speed limitation (beyond base speed)-constant power electrical limitation and mechanical upper-speed limitation. This article targets the application of motors not specifically designed for AFC operation. Generally, NEMA motors (i.e., motors up to the 440 frame) are more apt to be indiscriminately applied on AFCs than above-NEMA (ANEMA) motors (i.e., motors larger than the NEMA frame sizes). The concepts/guidelines presented here are equally applicable to both NEMA and ANEMA motors