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Bredthauer Jurgen Wachta Bernhard Appleton Steve 《Industry Applications, IEEE Transactions on》1987,(3):451-463
An important role is played by the compressor in the petrochemical industry. Typical high-speed compressor drivers are turbines and induction and synchronous motors. The cylindrical-rotor synchronous motor and its application as a high-speed compressor driver is discussed. Important tasks within the production processes of the petrochemical industry include gas liquefaction, compression, refrigeration, and heat recovery. Compressor drive systems constitute important components in plants for such processes. In the past, large high-speed radial and axial compressors were driven mainly by turbines, but in recent years electric motors have been used increasingly. In addition to lower plant costs, the advantages Include high operating efficiency, low pollution, and simpler handling and maintenance. The majority of drives are operating at constant speed, using a four-or six-pole motor with stepup gear. For large ratings, synchronous motors are preferred. For these a number of specific characteristics, such as electrically excited oscillating torques during asynchronous acceleration and special cooling conditions, must be considered. The urge for optimum operating characteristics has led to the development of the synchronous motor with laminated cylindrical rotor, derived from the two-pole turbine-driven generator. The design structure, the steady-state and dynamic operating characteristics, and the starting performance during asynchronous acceleration of such synchronous drive systems are the topics covered here. The theoretical background has been excluded from the normal text and is summarized in the Appendices. 相似文献
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This work presents an analytical methodology for selecting the most economical mix of drivers for large mechanical load and power generation for offshore production in the Gulf of Mexico. These method accounts for CAPEX, life-cycle costs and the effect of emissions and production availability in the selection of drivers and associated equipment. Result of driver studies have shown that all electric designs are viable on floating platforms in the Gulf of Mexico. 相似文献
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开关磁阻电机(SRM)具有结构简单、成本低、控制灵活等优点,尤其组成的调速系统具有交、直流调速系统所没有的优点。但由于电机本身的非线性电磁特性,导致了其转矩脉动比其他传动系统严重,因此如何控制好转矩成为关键,而转矩控制最终要通过控制电流来实现。对8/6结构SRM的绕组磁场特性及电感进行分析,构建了基于3层结构的径向基函数(RBF)神经网络的SRM电感模型,该模型算法简单并能较好地反映SRM电感非线性模型;依据该模型提出了一种自调节的电流控制方法,该方法通过已建立的SRM电感模型动态调节PWM的占空比,克服电感对电流的影响。实验结果证明,该方法使实际电流很好地跟随给定电流,有效减小了电流波动,取得了良好的电流控制效果。 相似文献
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朱卫国 《国外电子测量技术》2007,26(8):9-11
在嵌入式操作系统Windows CE下,为了驱动外部USB设备,本文介绍了一种基于流接口驱动的USB设备驱动开发方案,先后从注册表的配置、驱动程序的加载、流接口驱动、软件设计等方面详细地分析了驱动程序的构成和工作原理.该方案有效地降低了USB传输协议编程的复杂度,并且易于代码维护和功能扩展.实验表明,该驱动实现了USB设备与操作系统间的高效数据传输,且具有可靠性高、传输速度快等特点. 相似文献
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伺服驱动器的DeviceNet控制接口 总被引:1,自引:0,他引:1
针对伺服驱动器向智能化、网络化方向发展的需要,以及目前国际标准现场总线Devi-ceNet没有对伺服驱动器定义设备描述从而给产品设计等实际应用带来困难的问题,作者对现有DeviceNet电动机控制设备层协议进行了深入分析,对伺服驱动器进行了接口定义,并给出了对伺服驱动器进行控制的信号流图,完成了实验系统硬件研制和软件编制,并进行了相关的实验测试。实验结果证实了所提出方法的可行性和实用性,是对DevcieNet协议中电动机控制设备层部分的一个重要补充,对设备描述部分的研究过程也适用于其它特定用途的DeviceNet节点开发。 相似文献
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三电平六相同步电机变频调速技术研究 总被引:3,自引:0,他引:3
中压逆变技术是大容量变频调速的首选方案,但受到功率器件耐压等级和导通电流的限制,仅仅依靠中压逆变技术来进一步提升调速系统的容量已经变得非常困难。多相电机是实现大容量传动的又一途径。该文以这两种技术为研究背景,探索结合中压逆变技术和多相电机技术的调速方案:文章在三相同步电机矢量控制的基础上扩展建立了六相同步电机的气隙磁通定向矢量控制方法和六相同步电机的气隙磁链观测技术;文章将六相逆变器分解为两个三相逆变器来控制,从而简化了六相三电平逆变器的空间矢量调制和中点电位平衡处理。作者利用这些技术设计开发了"690V/ 200kW三电平六相同步电机变频调速装置",并在该装置上进行大量动态和稳态实验研究,取得良好的运行效果。 相似文献
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《Device and Materials Reliability, IEEE Transactions on》2006,6(3):347-348
This Special topic Issue of IEEE TRANSACTIONS ON DEVICE AND MATERIALS RELIABILITY documents the recent progress in the area of reliability of Smart Power devices. These high voltage/power devices such as LDMOS and DeMOS are increasingly integrated into advanced process technologies for mixed signal IC applications, e.g. smart low-side and high-side drivers, motor and relay driver/controllers, printer and display drivers/controllers, audio amplifiers, xDSL line drivers, high efficiency power management circuits for ac/dc conversion and dc/dc conversion (programmable buck, boost, and linear regulators). Reliability challenges in these devices are gaining more attention in the industry. This issue contains one review paper and several contributed papers covering a range of topics on reliability physics, characterization, and failure mechanisms of Smart Power devices. This collection of articles will be of great interest to anyone working in the held of Smart Power reliability 相似文献
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大气隙直线感应电机的力特性分析 总被引:6,自引:1,他引:6
大气隙直线感应电机(气隙长度大于10mm)目前已经在地铁、轻轨中得到了很好的应用,在过山车、海盗船等大型游乐设备中也有很好的应用前景,其推力与法向力特性对系统性能很重要.该文介绍了该类电机的结构与设计所用的传统等值电路.通过实验证明,等值电路对计算电流与推力仍然有效,而法向力的计算与纵向边端效应对气隙磁场的影响则需要建立在有限元数值分析方法基础上;在此模型基础上分析了推力、法向力与电机初级电流大小、电流频率、气隙长度之间的关系.结果表明大气隙直线感应电机的法向力与推力之比小于普通直线感应电机,因此法向力基本不影响应用系统.该文的结论为此类电机的设计与应用提供依据. 相似文献
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对步进电机有源抑制驱动器工作原理进行了分析和运行实验,结果表明,同样1台步进电机配用有源抑制驱动器可以达到更高的转速,节省更多的电机,说明有源抑制驱动器是目前步进电机若干种驱动器中综合性能最好的一种。 相似文献