共查询到20条相似文献,搜索用时 62 毫秒
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本文详细分析了同步电动机运行中因励磁装置技术性能不完善而出现的问题 ,对比提出了用先进的LZK智能型励磁装置取而代之的必要性。 相似文献
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介绍励磁装置结构和原理,以及WKLF-41微机控制励磁装置在矿山磨机大型化无刷同步电动机上的应用,并对励磁系统稳定运行所采取的技术措施和在使用中需注意的问题进行说明。 相似文献
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阐述了唐钢中型轧钢厂杭氧六千机组空压机同步电动机应用BKL系列高可靠多功能励磁装置,改善了电气设备的技术性能和运行可靠性 相似文献
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阐述了唐钢中型轧钢厂抗氧六千机组空压机同步电动机应用BKL系列高可靠多功能励磁装置,改善了电气设备的技术性能和运行可靠性。 相似文献
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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… 相似文献
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Y O'Connor 《Canadian Metallurgical Quarterly》1993,106(1265):198-201
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CW Cole 《Canadian Metallurgical Quarterly》1997,349(9064):1490-1491
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The recently published 1994 National Earthquake Hazards Reduction Program (NEHRP) provisions include new and substantially improved provisions for the seismic design of nonstructural components, including architectural, mechanical, and electrical components. The provisions are a significant departure from the 1991 NEHRP provisions and other seismic provisions, such as those offered by the 1994 Uniform Building Code (UBC). The design-force provisions are rationally derived and consider actual in-structure acceleration data recorded in recent significant California earthquakes. Also considered in the design-force equations are the dynamic properties of the components, the location of the component within the supporting structure, the safety and operational importance of the component, and the component's anchorage ductility and energy-absorption capability. The resulting force requirements of the new recommendations are compared with the 1991 NEHRP provisions and the 1994 UBC requirements. In addition, explicit design displacement provisions are introduced and discussed. 相似文献
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Benjamin P. Thompson Stuart D. Anderson Jeffrey S. Russell Awad S. Hanna 《Canadian Metallurgical Quarterly》2002,18(3):129-137
This paper presents guidelines for implementing the construction warranty contracting method in the highway construction industry. A logical, step-by-step method for effectively applying the warranty contracting program for use in the highway construction industry is developed. Relevant issues that may present obstacles to the implementation are addressed, while the best practices, compiled from an evaluation of the current industry’s state-of-the-art practices, will assist an interested state highway agency in creating a warranty specification. In performing this research, the current use of warranty specifications among state highway agencies was examined, and an in-depth case study of the Wisconsin Department of Transportation’s warranty program was conducted. 相似文献