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V. K. Voronin S. A. Evdokimov A. I. Leviush A. L. Trofimov 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2006,40(3):190-195
Disturbance of the grounding of the shaft of a turboset or its absence for technical reasons can result in failure, misoperation,
limitation of the operating zone, errors or limitation of the sensitivity of devices for control and protection of exciting
circuits from single-point leakage, and electroerosion of elements of the turboset structure. Measures for increasing the
reliability of the grounding of the shaft are discussed.
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Translated from élektricheskie Stantsii, No. 3, March 2006, pp. 61–66. 相似文献
3.
R. Masui 《International Journal of Thermophysics》2002,23(4):921-935
The development of a magnetic suspension densimeter that has been built for measurement of the density of compressed liquid at pressures up to 30 MPa in the temperature range 20 to 150°C is described. The densimeter was first built by the author and his coworkers at NIST. We describe here further improvements made on a second system built at NMIJ based on the same principle. The densimeter uses a small coil suspended from an electronic balance. Within the coil is placed a sample cell in which the pressurized sample and a buoy, which is a permanent magnet, are enclosed. For measurement of density, balance readings are recorded (1) with the buoy at rest and (2) with the buoy in magnetic suspension. The measurement procedure is basically a hydrostatic weighing, which is simpler than those of conventional magnetic densimetry. As an example, measurements of toluene density performed as part of an inter-laboratory comparison are presented. The data agreed with reliable literature values to within a few hundredths of a per cent. 相似文献
4.
Shunsuke Ohashi 《Electrical Engineering in Japan》2005,150(1):71-77
Magnetic bearing using pinning force of a permanent magnet and a high‐temperature superconductor has been developed. Additional permanent magnet is introduced to increase the levitation force of the magnetic bearing. In this hybrid magnetic bearing system, levitation force is mainly given by the repulsive force of the permanent magnets, and stability for the lateral direction is given by pinning force of the superconductor. The experimental device is developed. A ring‐type superconductor and a bulk one are examined. Levitation characteristics of the hybrid magnetic bearing are measured. The bulk superconductor shows better characteristics of both levitation and lateral stability than the ring one. Levitation force of the hybrid system becomes about twice as large as that of the nonhybrid one. Although, the repulsive force of the permanent magnet decreases the lateral stability of the system, its influence becomes small by choosing an adequate position of the permanent magnets and the superconductor. © 2004 Wiley Periodicals, Inc. Electr Eng Jpn, 150(1): 71–77, 2005; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10350 相似文献
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介绍了如何使用PLC和数字变频调速技术 ,对传统环锭捻线机进行技术改造 ,使锭速、捻度和卷绕成形变换实现数字化柔性控制 ,扩大了工艺参数的变化范围 ,使整个捻线加工车间实现信息化管理成为可能。 相似文献
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微机控制缠绕机控制系统的数字仿真监测 总被引:1,自引:0,他引:1
本文采用控制系统的数字仿真技术,在STD工业控制机上实现了对微机控制纤维缠绕机控制系统的稳速精度、跟踪性能和光电编码器的性能的监测。文中阐述了检测电路、测量方案、仿真程序设计和结果分析等内容。 相似文献
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在实践经验的基础上,分析了我国匝间绝缘短路的主要原因,提出在匝间绝缘的设计,制造工艺及耐压试验等工序采取合理措施,以提高匝间绝缘的可靠性。 相似文献
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