平衡工厂维护成本和活动与实现生产目标的需要是大多数维护专业人员每天面临的挑战. 由于电机驱动系统往往是这一动态的关键组成部分, this article looks at some best practices to help it achieve those goals and meet customer demands.

校准两台旋转机器的程序需要测量它们的相对轴位置，并调整一台或两台机器. Until recently, though, how closely the shafts need to be aligned was an open question. That changed with the publication of American National Standards Institute/Acoustical Society of America (ANSI/ASA) standard 2.75-17.

This webcast will focus on identifying resonance and then move to methods that help 可视化 振动运动，帮助确定解决方案.

Determining the source of noise in a motor is often much more challenging than correcting it. 然而, a methodical approach to investigating noise can narrow down the possible causes and therefore make resolution easier.

在将交流机器投入使用之前, 确保其工作等级符合应用要求. Otherwise, there’s a good chance excessive heat will degrade the machine’s windings.

半开玩笑地说:“如果它是黑白的, it must be right” is a helpful reminder that not everything we read (or hear) is accurate or complete. It’s always best to check sources and verify facts before accepting consequential statements as true. This article provides a selection of common misconceptions about three-phase squirrel-cage motors and the facts that deny them.

End users or service centers often need to specify replacement pumps or pump motors, 有时涉及改造或重新应用项目. 成功的结果取决于对应用需求的准确评估和对控制泵性能的参数的良好理解.

Here’s a random collection of common misconceptions about three-phase squirrel-cage motors and the facts that deny them.

Determining the source of noise in an electric motor is often more challenging than correcting it. 有条不紊的调查方法, 然而, can narrow the possibilities and make it easier to resolve the issue—with one caveat. 如果噪声是由于电机设计中的某些问题引起的(例如.g., a manufacturing defect or anomaly), a solution may be impossible or impractical.

Storing an electric motor for more than a few weeks involves several steps to ensure it will operate properly when needed.  温度等因素, humidity and ambient vibration in the storage area also influence the choice of storage methods, some of which may be impractical for smaller machines or need to be reversed before the motor goes into storage.

确保房车电气设备的可靠性, 尤其是电动机, 露营者必须知道他们的房车所使用的连接的服务电压. Teaching consumers to check that before they plug in the vehicle could save them many headaches.

垂直涡轮泵(VTP)通常具有由垂直泵电机支持的多个混流叶轮(有时为12个或更多)的转子. Such designs offer a lift adjustment for raising or lowering the pump rotor to properly position the impellers within the bowl. 取决于泵的类型, this may be critical for maximizing pump efficiency and could have a significant impact on motor load (current) and reliability.

立式涡轮泵依靠立式电机的推力轴承来支撑泵转子和电机转子的联合重量，并抵消泵叶轮在提升液体时产生的动态下推力.

熟悉工业电动机的人几十年来一直听说“直流电已死”，因为用于交流鼠笼式感应电动机(SCIMs)的变频驱动(VFD)技术的进步似乎注定要在所有可能的应用中取代直流电.

但就像DC的灭亡被夸大了一样, 无论是用于新应用还是替换电机，后续技术很快取代已安装的scim基础的前景也是如此.

无论采用何种方法检测绕组温度, 总, 或者热点, temperature is the real limit; and the lower it is, 更好的. 不要让过热过早地杀死你的马达.

Occasionally an end user wants to take a motor designed for horizontal mounting and use it in a vertical position. 本文解决了在垂直安装位置应用水平滚珠轴承电机时应考虑的一些关键机械因素.

热带风暴过后的洪水, 包括飓风, 季风和气旋, and with their associated heavy rainfall can shut down hundreds of plants along the Gulf Coast, 从佛罗里达到德克萨斯, 在世界其他地方也是如此. 而且他们这样做的频率越来越高. 让他们重新运转起来, 维修部门和电机维修人员面临着清理数千台电动机和发电机上的污垢和湿气的艰巨任务. 这种情况下的处理过程可能需要数周时间, 如果不是几个月, and requires special clean-up procedures for motors contaminated by saltwater.

One of the most common repairs on centrifugal pumps is replacing worn or damaged wear rings. 恢复效率, 可靠运行，防止灾难性泵故障, it is critical to restore proper clearances between the stationary casing wear ring and the rotating impeller wear ring. Although many pump manufacturers provide clearances and dimensions, some do not. There are plenty of aging pumps around from now-defunct manufacturers for which dimension data is simply not available.

在这种情况下, the rule of thumb that follows provides some guidance for acceptable running clearances, or the minimum running clearance chart in American Petroleum Institute (API) Standard 610 can be used as a guide.

需要速度和/或转矩控制的最终用户通常会购买变频驱动器(vfd)来修改已有标准感应电机的现有应用. Frequently, they try to control costs by using that existing standard induction motor. Before taking that path, 然而, it is best to consider a few areas of concern with the approach.

Selection of replacement motors is usually straightforward if the ratings are equivalent. 然而，有时，不同类型的电机是必要的或可取的. 在这些情况下取得成功, it is essential that the replacement motor provide the required performance — and do so reliably.

国际电工委员会(IEC)标准60529, 外壳提供的保护程度(IP代码),” addresses the degrees of protection for electrical machines (motors and generators). The “IP” acronym means “international protection” but is sometimes referred to as “ingress protection.” The IP code is commonly displayed on the nameplates of metric machines that are manufactured to IEC standards.

从2020年1月开始，美国将在.S. 美国能源部(DOE)将开始实施首个淡水旋转动力(离心和轴流)泵的能效标准. 这些标准将直接影响到泵制造商和, 在较小程度上, 水泵维修市场, while ultimately benefiting end users if the new focus can reduce their energy costs.

Whether you're selecting a motor for a new application or a replacement for one that has failed, 您需要一种可靠的方法来匹配各种电机的功能和性能特征与应用程序的要求.

当面对一个生病或失败的电机, 核电站操作人员通常会考虑是维修还是更换. According to a 2014 study conducted by Plant Engineering magazine for the Electrical Apparatus and Service Association (EASA), 只有一半以上的工厂有自动更换低于一定马力等级的故障电动机的政策. While that horsepower rating varied depending upon the plant’s installed motor population, 平均评分为30马力.

虽然这些政策只针对大多数工厂使用的部分电机, 它们不包括那些马达发生的事情. 这个问题在欧洲航空安全局最近委托的一个研究项目中得到了解决，该项目的重点是考虑维修的电动机的处置.

立式涡轮泵(vtp)是石油化工行业的主力设备, 发电和制造业, and prolific in municipal water applications that handle the primary intake load. 尽管这些机器构造粗糙, 泵中的研磨性沉积物会造成损失, 特别是在线轴和泵碗轴承上, 因此，定期检修通常是必要的. 而不是简单地更换轴承, 然而, it is important that repairs address all of the issues needed to restore maximum operating life.