高压电动机滚动轴承故障的分析与预防

滚动轴承故障是影响高压电动机正常运行和发电机组可靠供电的重要因素之一。综合分析高压电动机轴承故障原因,提高高压电动机检修质量,作好轴承运行中诊断分析是预防高压电动机轴承故障的重要措施。     

高压电动机滚动轴承故障的分析与预防

滚动轴承故障是影响高压电动机正常运行和发电机组可靠供电的重要因素之.一..本文综合分析高压电动机轴承故障原因,提高高压电动机检修质量做好轴承运行中诊断分析是预防高压电动机轴承故障的重要措施.     

电动机轴承故障分析及改进

介绍了发电厂电动机故障原因分析和改进方法,并对各种中型电动机故障检修经验进行了总结和分析,轴承损坏造成电机故障最多。     

电动机轴承损坏原因分析及改进措施

<正>林丰铝电二厂生产车间的600余台电动机由博奥公司林丰项目部负责维护。有一段时间,电动机多次出现轴承问题,影响到生产的正常进行,造成检修费用和检修工作量的增加。下面结合实际案例对造成电动机轴承损坏的原因进行分析并提出改进措施。1案例1.1案例1(1)故障现象。2013年7月8日上午,检修人员在巡检设备时发现阳极组装车间抛丸机除尘电动机轴承声音异常。阳极组装车间提供2套新轴     

电动机轴承故障分析及改进

介绍了发电厂电动机故障原因分析和改进方法,并对各种中型电动机故障检修经验进行了总结和分析,轴承损坏造成电机故障最多.     

高压电机滚动轴承故障浅析

对高压电动机滚动轴承故障原因进行了详细的分析和总结，有利于现场检修人员对高压电机轴承故障的判断处理和预防。     

单相异步电动机的检修

单相异步电动机长期使用后,会产生一些故障,影响其正常运转,下面介绍几种常见的故障及修理方法。 1 电机绕组短路的原因和检修方法 1.1 电机绕组短路的主要表现 电动机转速下降,电流增大,电动机发热严重,甚至将绕组烧毁。 1.2 短路的原因 电机绕组受潮严重,绕组导线间的绝缘被破坏,导致通电时,发生导线间的绝缘被击穿,造成绕组短路,所以,当电机较长时期搁置不用时,若要再用,应先通较低电压,让电机空转一段时间,等潮气排除后,再加全压运行;嵌线时,破坏了电机绕组导线的绝缘外皮,或在电动机作绝缘强度检验时,造成极少数导线绝缘有轻微击穿。经过一段时间的使用,使原来的击穿点扩大,导致绕组短路。 1.3 绕组短路故障的检查 拆下电机盖,拿出转子,观察定于绕组有没有发黑的烧焦点。如果有发黑的烧焦点,说明此处就是绕组短路点;如果短路点不易被发现,可用测绝缘的摇表逐个绕组摇测。根据短路绕组的烧毁程度,来决定是更换部分导线还是更换整个绕组,或者是给电动机重新嵌线。 2 电动机绕组接地故障的检修     

电动机轴承烧损故障原因分析与处理

包头第一热电厂供热系统自投运以来,电动机频繁出现轴承烧损故障,经分析,是由于运行过程中产生轴电流而导致轴承烧损,对此,提出改造电动机定子及端盖结构等方案以消除轴电流。改造后测试电动机轴电流为0,电动机恢复正常运行状态。同时,针对此次故障,提出当电动机轴承产生轴电压后,在运行及检修过程中的处理及预防措施。     

《电机技术百科》讲座(二十二)

3.5 维护和检修 [1] 电动机的故障 (a)故障的种类现将主要的故障项目收集如下: (i)轴承的不良、破损 (ii)绕组绝缘不良,损坏 (iii)结构材料的老化,破损 (iv)各部的腐蚀 (v)由于外因的破损、烧坏     

家用电动器具电动机常见故障的检修

家用电动器具所采用的电动机多为单相电容运转式异步电动机(如风扇，洗衣机电动机)和单相串励式电动机(如吸尘器电动机)。就这两种电动机本身来说，有可能出现的故障大致可分为以下几个方面：①电容器故障；②电刷换向器故障；③绕组故障；④轴承故障。检修电动机的故障是一项细致而复杂的工作，检修经验固然是最重要的，但检修的基本步骤和具体的检查方法则是最基本的，因此必须掌握一般检修规律。     

高压电动机绝缘损坏原因的综合分析及对策

针对某发电厂高压电动机的绝缘事故，着重分析了开断电动机时的操作过电压及其保护措施的效果，并从电机绝缘、操作维护、运行环境等方面进行综合分析，找出了绝缘损坏的原因，并提出相应的对策措施。     

感应电机常见故障的模糊诊断（之一）

轴承故障、定子绝缘故障与绕组股线断股、鼠笼转子断条等故障约占鼠笼异步电机故障的８０％。在本文和其姊妹篇中，详细地讨了用模糊诊断方法对上述各类故障进行诊断的问题。本文将监测所得振动信号的时域方差和峭度，以及其振动信号的包络的幅频谱所得的几个特征频率处的幅度转化成隶属度向量，作为模糊诊断度。本文还介绍了用最小二乘原理，对实验室一台７．５ｋＷ的鼠笼异步电机滚动轴承故障的隶属度函数、模诊断关系矩阵进行自学     

Solid-State Control-Low Voltage Heating of Motors

In recent years, industrial plants have been utilizing more electric motors as drivers because of their high efficiency and reliability and lower maintenance costs. Electrified continuous process plants are using electric motors for both primary and standby drives. When these standby motors are not operating during normal plant runs, their windings collect moisture. Moisture attacks insulation and causes insulation failure. A breakdown of motor insulation may occur when a standby motor is suddenly energized to take the place of the primary motor. When it is not in operation, directly heating the motor winding with a low voltage system, coupled with automatic control, will guard the motor from moisture attack and extend its service life. The experience with low voltage heating of motor windings as described by M. H. Yuen in his article [1] has proved its effectiveness. However, conventional relays, timers, contactors, etc., were utilized in the circuits.     

Reducing unscheduled plant maintenance delays-field test of a newmethod to predict electric motor failure

Most electric motor predictive maintenance methods have drawbacks that limit their effectiveness in the mining environment. The US Bureau of Mines (USBM) is developing an alternative approach to detect winding insulation breakdown in advance of complete motor failure. In order to evaluate the analysis algorithms necessary for this approach, the USBM has designed and installed a system to monitor 120 electric motors in a coal preparation plant. The computer-based experimental system continuously gathers, stores, and analyzes electrical parameters for each motor. The results are then correlated to data from conventional motor maintenance methods and in-service failures to determine if the analysis algorithms can detect signs of insulation deterioration and impending failure. This paper explains the online testing approach used in this research, and describes monitoring system design and implementation. At this writing, data analysis is underway, but conclusive results are not yet available     

浅谈Z1000型直流电机的设计

介绍Z1000型直流电动机结构及设计特点.该型电动机采用变截面电枢导体,电枢铁心外围用高强度无纬带固定,大圆角铜母线结构的补偿绕组,分块式电刷等;采用少胶粉云母带卷包结构的绝缘,采用整体框架式结构,轴上焊筋的整体式支架,端盖式滚动轴承,背包式空-水冷却系统;该型电动机结构强度高,使用维护方便,满足了单机高转矩、高调速比的要求.     

增安型无刷励磁同步电动机的轴承绝缘

轴电流会造成增安型无刷励磁同步电动机滑动轴承的严重损坏,并且影响到其防爆性能。对滑动轴承进行绝缘,断开轴电流的通路,是防止轴电流最简单、最适用的方法。介绍了增安型无刷励磁同步电动机用滑动轴承的绝缘设计、配置以及绝缘轴承在现场安装调试、运行时的注意事项。     

高压电动机绝缘老化诊断与寿命评价

高压电动机的寿命主要决定了绕组绝缘强度,所以掌握绕组绝缘的老化状态,对于做好高压电动机的计划检修是非常重要的.主要介绍高压电动机绕组绝缘的电气绝缘诊断法以及绝缘材料的热老化诊断法.     

An Advanced Stator Winding Insulation Quality Assessment Technique for Inverter-Fed Machines

The lifetime of the stator winding insulation is reduced when operated with pulsewidth-modulation inverters, since insulation degradation is accelerated due to increased thermal and electrical stresses on the motor. This paper focuses on a new approach for monitoring the condition of the stator insulation for failure-prone inverter-fed machines. The main concept of the proposed technique is to apply a dc and/or variable-frequency ac test voltage to the stator insulation using the inverter and to perform standard offline insulation tests whenever the motor is not operating. This allows the stator insulation to be tested more frequently as compared to offline tests performed once every three to six years during periodic maintenance. Two methods for testing the insulation with minimal modifications to the inverter circuit are proposed and verified experimentally. The results show that the proposed technique provides a simple low-cost solution for detecting stator insulation degradation at an early stage for reliable operation of inverter-fed machine systems, since the insulation condition can be monitored frequently. This does not only helps prevent forced outages and safety risks due to insulation breakdown but also helps perform maintenance in an efficient manner, since individual motor maintenance can be prioritized and scheduled based on its present condition.     

电动汽车电机驱动系统可靠性模型及预计

能源危机促进了电动汽车的发展,作为其关键部件之一的电机驱动系统的可靠性直接影响着电动汽车的广泛应用.重点对电动汽车电机驱动系统可靠性进行分析.建立了电动汽车电机驱动系统可靠性串联模型.直流母线支撑电容、大功率电子器件、控制电路、轴承和绝缘的失效是电动汽车电机驱动系统的主要失效模式.基于已建立的可靠性模型,采用元器件应力分析法预计电动汽车电机驱动系统的可靠性.     

基于MCS和AlexNet的水润滑推力轴承故障检测

水润滑推力轴承作为潜水电机的重要组成部件常由于工作环境恶劣、过载和冷热交替,轴承结构磨损而进入异物。针对在潜水电机内拆装加速度传感器困难，水阻尼污染振动信号采集等问题，提出故障状态下潜水电机的数学模型，对仿真得到电流信号进行时移降噪，升维预处理，基于AlexNet模型训练不同状态下电机电流信号（MCS）。经验证，模型能以较高的准确率快速识别故障信号，具有较强的鲁棒性，满足故障诊断预见性和实时性要求。