Understanding the Impact of Misalignment on Motor Efficiency
This article will discuss percentages related to several potential failure points based on data collected from a 1-hp, 1765-rpm, 460V, 1.5 Amp motor operating at several load points. We’ll then compare this to a 600-horsepower motor that’s operating with a misalignment. We reference ANSI/ASA S2.75-2017, “Shaft Alignment Methodology, Part 1: General Principles, Methods, Practices, and tolerances,” for the alignments.
The data in each case is collected with an EMPATH™ Electrical Signature Analysis (ESA) system that provides a measurement of watts by defect (spectral analysis of power). The percentage of additional greenhouse gas emissions (GHG) above the total expected GHG will be included in the analysis.
The first thing was to take the test motor and evaluate it after using a ruler to align a direct-drive coupling and measure the load. The power spectra was measured and losses specific to 0.5 and 1 times rpm, static eccentricity peaks, and bearings were identified in watts lost at the defect frequencies.
This work was performed in a lab to isolate specific defects. The second test was alignment performed to minimum industry specifications. The last test performed was “precision alignment,” which we define for this article as 25% of the tolerances for a standard tolerance. The results of all tests were calculated, as shown in Equation 1 below, and are presented as percentages in Table I. (The curve for Equation 1 is shown in Figure. 1.)
Deja un comentario