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定子绕组是三相异步电动机的心脏部位,是最容易损坏而造成故障的部件。因此,三相异步电动机的常见故障一般出现在定子绕组部位,其故障形式多为绕组接地、绕组短路、绕组断路以及绕组接错等。文中就电动机绕组常见故障现象、产生原因、检查方法和维修方法进行了详细的阐述。 相似文献
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1电动机常见故障及排除方法异步电动机的故障可分为机械故障和电气故障两类。机械故障如轴承、铁心、风叶、机座、转轴等故障,一般比较容易观察与发现;电气故障主要是定子绕组、电刷等导电部分出现的故障。由于电动机的结构型式、制造质量、使用和维护情况的不同,往往可能出现同一故障有不同外观现象,或同一外观现象引起不同的故障。 相似文献
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本文论述在线监测大型汽轮发电机定子绕组股线电弧故障和定子绝缘过热检测。前者通过高频电流互感器测量发电机中性线的射频电流来监测定子破损绕组产生的电弧，后者通过离子室测量离子流大小来监测定子绕组过热后放出的高分子化合物含量诊断过热程度。两者均能够用于早期检测发电机内部异常状态并报警，以避免事故扩大，对减少设备故障停运，保证电力系统可靠运行有重大意义。 相似文献
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利用实物模型进行教学是行之有效的方法之一,能够表达书面语言所不能表示清楚的意思。本文浅谈应用“筒体形模型”,在绕组展开图、绕组嵌线示意图、圆形接线图、槽电势星形图的作用,在三相异步电动机定子绕组的实体与定子绕组的理论系统架起联系桥梁,便于指导、展开电动机定子绕组的教学,易学易懂。 相似文献
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利用实物模型进行教学是行之有效的方法之一,能够表达书面语言所不能表示清楚的意思。本文浅谈应用"筒体形模型",在绕组展开图、绕组嵌线示意图、圆形接线图、槽电势星形图的作用,在三相异步电动机定子绕组的实体与定子绕组的理论系统架起联系桥梁,便于指导、展开电动机定子绕组的教学,易学易懂。 相似文献
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三相异步电动机在运行中的故障属绕组烧坏的约85%,机构及其他故障约15%。绕组烧坏的原因多为缺相运行、过载运行、绕组接地、绕组相间或匝间短路等。其次是定、转子摩擦、断条等机械原因。着重从电气角度分析电机绕组烧损的原因,并提出相应的处理方法。 相似文献
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单相异步电动机的工作绕组通以单相交流电源时,气隙中将建立脉振磁场,不产生起动转矩。为解决单相异步电动机起动问题,采用电容分相式的单相异步电机通常在定子上增加一套辅助绕组,使与工作绕组构成两相绕组,利用两相绕组通以两相交流电时能在气隙中建立旋转磁场(圆形或椭圆形),产生起动转矩,使单相异步电动机在家用电器中应用很广泛。 相似文献
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三相异步电动机的定子绕组是电动机的电路部分,它将通过电流建立磁场,并感应电动势以实现机电能量转换。三相定子绕组的每相由许多的线圈按一定的规律嵌放在铁心槽内,它可以是单层的,也可以是双层的,也可以是整距的或短距的。了解定子绕组的嵌线工艺、连线方法,对电机的制造和维修都是十分必要的。 相似文献
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电动机是煤矿安全生产中的重要设备,其性能直接影响煤矿设备的正常运转,电动机使用前需要进行性能测试。交流异步电动机加载试验台实验项目包括绕组绝缘电阻测定、空载检查、分级载荷试验、超载试验等。所设计的交流异步电动机加载试验台能够为矿用电动机的性能提供精确的参考数据。 相似文献
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Jediael Machín Almeida Alexander G. Loukianov José M. Cañedo Castañeda Jorge Rivera Dominguez 《Journal of The Franklin Institute》2018,355(7):3221-3248
Using a nonlinear complete order model of a synchronous motor, a robust second order sliding mode observer based control scheme is proposed. For that, a generalized super-twisting 3rd order observer is proposed for nonlinear systems. Based on the proposed observer scheme, a robust rotor flux observer is designed, then, a stator current observer is proposed using a classical super-twisting algorithm for extracting information of the rotor speed by means of the equivalent control method. The control design for the output tracking of a desired reference signal for the rotor speed is carried out with a classical super-twisting sliding mode algorithm and adaptive backstepping techniques. Due to the number of inputs, the flux in the excitation winding, and the direct component of the stator currents are also regulated. Numeric simulations predict a good performance of the closed-loop synchronous motor with parameter variations. 相似文献
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本文主要阐述了电动机断相运行给电动机造成的危害,并在分析对比常用的三种电动机保护优缺点的基础上,介绍了一种简易的适用范围较广、灵敏度较高,且具有节电功能的三相异步电动机保护的原理。 相似文献
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对异步电动机转子发生断条故障后所产生的特征频率分量进行了分析，揭示了其在起动过程中的变化过程，提出了在起动过程中检测转子断条故障的小波脊线方法。 相似文献
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本文针对异步电动机变频调速原理,结合变频调速矢量控制策略,基于Matlab/Simulink工具箱,建立了异步电动机矢量控制变频调速系统仿真模型,对异步电动机的矢量控制特性进行研究。设置了多种电机运行状态,对电机的空载、加载、加速、减速等动态特性进行仿真研究,验证了所建立的仿真模型的正确性和可行性。 相似文献
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Parameter fault detection and estimation of a class of nonlinear systems using observers 总被引：1，自引：0，他引：1
The focus of this paper is on the detection and estimation of parameter faults in nonlinear systems with nonlinear fault distribution functions. The novelty of this contribution is that it handles the nonlinear fault distribution function; since such a fault distribution function depends not only on the inputs and outputs of the system but also on unmeasured states, it causes additional complexity in fault estimation. The proposed detection and estimation tool is based on the adaptive observer technique. Under the Lipschitz condition, a fault detection observer and adaptive diagnosis observer are proposed. Then, relaxation of the Lipschitz requirement is proposed and the necessary modification to the diagnostic tool is presented. Finally, the example of a one-wheel model with lumped friction is presented to illustrate the applicability of the proposed diagnosis method. 相似文献
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《Journal of The Franklin Institute》2021,358(16):8485-8505
This paper presents corrective control of input/state asynchronous sequential machines (ASMs) against transient faults occurring in both ASM and corrective controller. Since not only the ASM but also the controller undergoes unauthorized state transitions as a result of the fault, the ASM is vulnerable to direct damage by transient faults as well as indirect one propagated from the controller under the fault. We address the existence condition and design procedure for a state feedback corrective controller which achieves self-repair against any transient fault, while diagnosing and overcoming those faults infiltrating into the considered ASM. Hardware experiments on field-programmable gate array (FPGA) are provided to validate the applicability of the proposed methodology. 相似文献
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《Journal of The Franklin Institute》2023,360(8):5609-5633
In this paper, we propose a fault diagnosis (FD) approach for a class of nonlinear uncertain systems based on the deterministic learning approach (DLA). Specifically, an adaptive learning observer is constructed, in which the adaptive neural networks (NNs) are constructed to approximate the unknown system dynamics under normal and fault modes. Based on the strictly positive real (SPR) condition, the convergence of the state estimation can be guaranteed. When the system is undergoing a periodic or periodic-like (recurrent) motion, the states of the observer will also become recurrent. Thus through DLA, the partial persistent excitation (PE) condition of the associated subvectors of NNs is satisfied. By utilizing the partial (PE) condition, the uniformly completely observable (UCO) property of the identification system is analyzed and the exponential convergence condition of the identification system is derived. Under this condition, the unknown dynamics under normal and fault modes can be accurately identified along the system trajectory. And by utilizing the knowledge obtained in the identification phase, the fault can be detected in the diagnosis phase. The main attraction of this paper lies in the analytical result, which shows that the exponential convergence condition of the learning observer not only depends on the observer gain matrix, but also depends on the PE level of the regressor subvector of NN. Simulation results are included to illustrate the effectiveness of the proposed scheme. 相似文献
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本文以三峡左岸电站ALSTOM机组为例,简要介绍了ALSTOM机组定子绕组的技术特点和安装流程,为今后同类型机组定子绕线安装提供了参考。 相似文献