Abstract
Electric motors form the bulk of prime movers for pumps, compressors, fans, and other driven equipment, which make up a significant portion of a typical petrochemical plant load. Proper application of electric motors ensures that a given service will be safe, reliable, and efficient; and to that end, motor vibration is a critical application consideration. This article outlines the principles of motor vibration; the electrical, mechanical, and civil reasons for its cause; and how vibration is detected and mitigated. We then compare the National Electrical Manufacturers Association (NEMA) Motors and Generators (MG)-1 and the American Petroleum Institute (API) motor standards from a vibration-limit perspective. Finally, we discuss what manufacturing or external methods are effective in reducing vibration and how rotors are balanced and tested to meet requirements. The goal of the article is twofold: to provide basic concepts and terminology related to medium-voltage (MV) motor vibration and to share an end user’s perspective on what matters most during design and installation.
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