Motor vibrations are tested as a part of factory acceptance testing (FAT), normally on a massive foundation. In two-pole motors, there are two main sources of vibration: rotor unbalance and electrical twice-line frequency excitation. Low vibration implies that the natural frequencies of the motor are separated from the corresponding excitation frequencies. Usually, if the site foundation is rigid, the vibration levels repeat FAT values with minor changes and are well within the initial limits for condition monitoring. However, if the foundation is flexible, the motor vibration may produce unexpected results. The aim of this article is to introduce a procedure to help ensure low vibration in site conditions in these cases. The procedure relies on early cooperation between the motor manufacturer and the system integrator based on the horizontal and vertical stiffness of the foundation. The most cost-effective solution can be reached by incorporating proper motor design features in conjunction with the design of the mounting base.

中文翻译：

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确保柔性基础上的两极电机的低振动：制造商与系统集成商的合作


电机振动测试是工厂验收测试 (FAT) 的一部分，通常是在大型基础上进行的。在双极电机中，有两个主要振动源：转子不平衡和电气双线频率励磁。低振动意味着电机的固有频率与相应的激励频率分离。通常，如果场地基础是刚性的，振动水平会重复 FAT 值，但变化较小，并且完全在状态监测的初始限值内。然而，如果基础是柔性的，电机振动可能会产生意想不到的结果。本文的目的是介绍一种程序，以帮助确保这些情况下现场条件下的低振动。该程序依赖于电机制造商和系统集成商之间基于基础水平和垂直刚度的早期合作。通过将适当的电机设计功能与安装底座的设计结合起来，可以实现最具成本效益的解决方案。