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介绍了GSD2系列可通信电动机保护器的主要技术指标及功能。通过对该系列电动机保护器基于DeviceNet现场总线,集总线通信、电流监控和过载、三相不平衡、接地故障等多种故障报警、保护功能的阐述,说明该保护器可实时高效地保护电动机,可作为节点挂接在DeviceNet总线上与主站进行通信。 相似文献
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针对传统电机保护器不具备通信功能的不足,该文以dsPIC30F6012单片机为主控制器,设计了一种基于DeviceNet的可通信智能电机保护器。它能在发生过载、三相不平衡、缺相等多项故障时实现对电动机的保护,并能够通过现场总线连接上位机实现对现场电机运行状态的实时监控。该文同时给出了相关的硬件电路、软件设计及DeviceNet通信的实现方案等。样机试验表明该电动机保护器工作可靠、实时性好,而且容易实现。 相似文献
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针对目前电动机保护器的在使用过程中的特点,介绍了一种基于智能型的可通信电动机保护器的监控系统的设计方案。上位机与可通信电动机保护器依靠现场总线技术组成监控网络。简单介绍了现场总线技术、MODBUS通信协议,用Visualc++设计了一种上位机监控软件,并对监控软件的关键技术做了介绍。 相似文献
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介绍了一种以ATnlega8为核心的电动机智能综合保护器设计方案.实现了对各种电动机故障的智能判断及保护,并针对目前电动机保护器对启动过程保护考虑较少的问题,采用了启动保护与运行保护分离的策略.在启动时段采用限时降压启动,从而实现了电动机的全程保护.该保护器选用CH452L数码管显示驱动和键盘扫描控制芯片,实现了参数设置和实时动态显示.该电动机智能综合保护器经过反复试验已经投入实际应用.取得了预期效果. 相似文献
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针对可通信电动机保护器设计开发要求,阐述了基于DSPICF30微控制单元芯片和DN1022总线通信芯片的硬件设计,对设计开发智能型电动机保护类电器具有很大的参考价值。 相似文献
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基于DeviceNet现场总线的网络式电机保护器节点集总线通信、电流监控和过载、三相不平衡、接地故障等多种故障报警、保护功能为一体,以均方根电流为判据,采用DN1022芯片作为现场总线节点的网络式电机保护器。实验结果表明,基于DeviceNet的网络式电机保护器可实时、高效地保护电动机,可作为节点挂接在DeviceNet总线上,与主站进行通信。 相似文献
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分析了一起电动机无人操作下误自启事故,排查出了电动机误启动原因为微机电动机保护监控装置由于内部电路设计原因和外部接线错误造成交流电干扰通信,为避免此类事故的发生和正确选择保护器提供了参考意见。 相似文献
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简要分析了电动机保护与控制的特征及关键技术,介绍了一种集测量、诊断、保护、控制和总线通信于一体的智能型电动机保护装置及其在智能变配电网络中的应用。 相似文献
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直线电机是近些年新兴起的一种新型电机,利用它可以输出直线运动的特点,本文将直线电机和传统的针织机械结合起来,设计出一种用于针织机械的新型超薄直线电机式电织针.设计应围绕针织机械要求的极其苛刻的厚度限制和良好的动态性能来进行,设计分为机械结构设计和电气设计,结构设计具体分为电机的动子设计、定子设计、热设计.这种新型的直线... 相似文献
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Capitanio M Vanzi F Broggio C Cicchi R Normanno D Romano G Sacconi L Pavone FS 《Microscopy research and technique》2004,65(4-5):194-204
Single-molecule techniques have propelled an impressive number of biophysical studies during the last decade. From relatively simple video-microscopy techniques, to sophisticated manipulation and detection apparata, single-molecule techniques are capable of tracking the movements and the reaction trajectories of single enzymatic units. By observing microspheres attached to biomolecules it is possible to follow the motion of molecular motors, or to detect conformational "switching" induced by regulatory proteins. Micromanipulation tools like optical tweezers have been widely applied to understand the mechanisms of linear molecular motors, and have allowed the measurement of the elementary steps and the forces produced by several motor proteins, including myosin, kinesin, and dynein. New experimental assays based on magnetic or optical "wrenches," which are able to apply and detect torques on rotary motors and biopolymers, are opening new possibilities in this field. Here, established and emerging magneto-optical manipulation and video-tracking techniques are reviewed, in the perspective of single molecular motors and regulatory proteins studies. 相似文献
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Induction machines play an important role in today’s industry. Thus, preventive maintenance combined with fault diagnosis techniques have become an essential issue. One of the most used techniques for the diagnosis of faults in the induction machine is motor current signature analysis (MCSA). This approach presents some limitations for induction motor rotor diagnosis, particularly for small faults. In this paper, a new motor square current signature analysis (MSCSA) fault diagnosis methodology is presented. The proposed technique is based on three main steps: first, the induction motor current is measured; secondly, the square of the current is computed; and finally a frequency analysis of the square current is performed. This technique allows more information to be obtained from a motor with a rotor fault than the classical MCSA approach. Simulation and experimental results are presented in order to confirm the theoretical assumptions. This methodology has also been tested for the identification of two distinct faults (broken bars and rotor eccentricity). 相似文献
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《Measurement》2016
Single-phase induction motors are used in the industry commonly. Induction motors are not expensive, so it is a reason to use them. Diagnostics of faults is very important. It prevents financial loss and unplanned downtimes causes by faults. In this paper the authors described fault diagnostic techniques of the single-phase induction motor. Presented techniques were based on the analysis of thermal images of electric motor. The authors measured and analysed 3 states of the single-phase induction motor. In this paper an original method of the feature extraction of thermal images called MoASoS (Method of Area Selection of States) was presented. The proposed method - MoASoS and an image histogram were used to form feature vectors. Classification of the obtained vectors was performed by NN (Nearest Neighbour classifier) and Gaussian Mixture Models (GMM). The described fault diagnostic techniques are useful for reliability of the single-phase induction motors and other rotating electrical machines such as: three-phase induction motors, synchronous motors, DC motors. 相似文献
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直线电机技术在CKS6125数控车床上的应用 总被引:1,自引:0,他引:1
采用直线电机技术的CKS6125数控车床,改变了传统的数控机床进给系统结构,使机床的加工精度、生产效率等性能指标得到了很大的提高. 相似文献
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