同步电动机转子位置检测方法的分析

转子位置检测是进行失量坐标变换，保证同步电动机正常工作的必要条件。本文分析了马钢Ｈ型钢厂同步电动机转子位置检测方法的原理，澄清了初始定位和计数器预置数值的确定这两个容易淆的概念。     

近代交流调速：第七讲 无换向器电动机

无换向器电动机是近年来发展起来的一种新型调速电机,它是由可控硅逆变器、同步电动机和转子位置检测器三者组成的电机系统。其运行原理和特性与直流电动机相似,结构上却没有机械换向器,故称为无换向器直流电动机,简称无换向器电动机。由于它采用可控硅变频器供电,又称为可控硅电动机。它的变频器的频率严格受控于转子位置信号,实质上是同步电动机的自控式变频调速系统。用交-直-交变频器供电的叫直流式无换向器电动机,用交-交变频器供电的则称为交流式无换向器电动机。 无换向器电动机由于它实际上是电子换向式的直流电动机,所以它既有与直流电动机相似的优良     

同步机矢量控制系统中码盘定位的调试方法

凌源钢铁公司中宽带生产线引进一套西门子公司的SIMADIN－C同步电动机变频调速的H手设备。在调试这种系统时，应当使用专用的电机模拟器，但是我们在调试过程中，没有这种装置。经过实践木断摸索，我们找出了一种不用电机模拟器的新方法，其中主要是找到对转子初始定位的一种行之有效的办法。同步电动机矢量控制系统须准确检测转子位置，其检测电路如图1所示。当电机旋转时，同轴的光电码盘发出相差图回转子位置检测电路框国90o电角度的A、B脉冲和同步的Z脉冲。A、B脉冲为每周256个，Z脉冲为每周1个。正常旋转时，A、B脉冲经过四倍频…     

负载换流同步电动机在高线精轧机主传动中的应用

介绍了用于包钢高速线材厂精轧主传动中的负载换流同步电动机控制系统。该系统中同步电动机定子为双电枢，转子采用无刷励磁方式，两变频器交叉串联联结，控制系统的控制原则是使同步电动机的利用率最优。     

ACS 6000 SD中压变频传动系统在高速线材轧制中的调试及应用

湖南华菱湘潭钢铁有限公司新建高速线材生产线,传动系统采用国产同步交流变频电动机,电控系统采用ABB三电平中压变频器ACS6000SD,变频器功率元件采用IGCT。介绍了电控系统硬件配置,对传动硬件选型和同步电动机励磁控制方式选择等进行了对比和分析,着重介绍了整流单元同步电压与主回路电压相序校验方法和逆变单元对电动机转子绝对位置编码器位置偏差的调试。另外对系统在试运行期间发生的一些典型故障作出分析、判断和总结,为今后系统故障处理提供一定的参考思路。     

塔式起重机用绕线型三相感应电动机调速方法纵横谈

分析绕线型三相感应电动机的转子串电阻与配合涡流制动器的调速，变极调压调速，转子斩波调速，转子串变频器的超同步调速方法的特点及应用现状，指出绕线型双速电动机转子串电阻与配合涡流制动器的调速和绕线型电动机转子串变频器的超同步调速是塔机实际应用中有推广前景的调速方法。     

交-交变频同步电动机转子位置检测方法

码盘定位在同步电动机交-交变频矢量控制系统中起着至关重要的作用,而且定位精度要求高,是该系统中的一个技术难点.在消化吸收国外交流调速系统所使用的转子位置检测器的基础上,介绍了码盘定位的方法.     

梅钢4号烧结机主抽风机变频软启动系统

介绍一个采用一台西门子GL150型LC I变频器依次启动两台6 900 kW同步电动机拖动的主抽风机的变频软启动系统。变频器的控制方式为转矩控制,启动方式为分段加速,变频软启动系统通过降压变压器-GL150变频器-升压变压器启动10 kV同步电动机。GL150型变频器采用大功率晶闸管元件,变频软启动系统在启动中通过直接检测定子电压、电流来计算转子位置,不需要外置的测速编码器。采用变频软启动方式启动大型高压电动机,避免了传统的不变频异步启动方式必然带来的电动机电枢发热严重的现象。采用GL150型变频器的变频软启动系统,在整个启动-并网过程中对电动机完全可控,对风机无冲击。     

5600kW同步电动机无刷励磁装置

１前言本钢氧气厂由德国林德公司引进的４＃１００００ｍ２／ｈ制氧机，其空压机配用了西门子公司５６００ｋＷ无刷励磁同步电动机。该机由辅助励磁回路给同步发电机同轴的励磁发电机激磁，励磁发电机通过转子上的固定旋转整流器由空心轴向同步电动机转子激磁绕组激磁，使电动机进入同步运行。大型同步电动机的励磁装置经历了由直流励磁发电机到晶闸管励磁装置的演进过程。由于晶闸管励磁装置具有无触点投励、自动控制等诸多优点，因而逐步取代了直流励磁发电机，但是它们的共同缺点是与主机的联接方式都离不开电刷及其附属机构。无刷励磁装…     

稀土磁体无刷电动机

在可变频率同步电动机及无刷直流电动机的转子结构中使用了永磁体。简要论述了这些装置。所用的控制方法,讨论了稀土磁体结构的必要技术条件。以稀土磁体无刷直流电动机为例,进行了讨论,並给出了这一系统的性能特征。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.