Ernesto Wiedenbrug, Ph.D., SM IEEE,
Virtually all rotors of motors above 100kW are designed with axial cooling vents, potentially causing false positives for both prevalent diagnostic technologies, vibration and MCSA. Fig 1 shows the rotor with 8 spider-legs of a 2.4MW 6.6kV motor that was pulled out of service due to such a vibration and MCSA false positive.
This paper explains how to recognize problematic motors, the reason for these false positives, how these motors react, and how to deal with them.
To continue reading the full case study, with images, please download the free PDF file here. http://csaanalysis.com/PDFS/Advanced%20Rotorbar%20Analysis%20-%20False%20Positives%20-%20Spiders%20-%20Axial%20Cooling%20Vents.pdf
To contact Whitelegg direct please visit http://www.whitelegg.com
This website is owned and operated by: MSL Media Limited
Co. Number: 05359182
© 2022 MSL Media Ltd. All rights reserved. E&OE