Analysis of the fretting wear phenomenon on the surface coatings of form-wound coil

M. Vite-Torres, F. P. Espino-Cortés, T. Asiaín-Olivares, J. Zaragoza-Granados, E. A. Gallardo-Hernández

Research output: Chapter in Book/Report/Conference proceedingConference contribution


© Springer Nature Singapore Pte Ltd. 2019. Electric rotating machines are prone to suffer damage of mechanical origin in some of their parts. It is the case of the fretting wear that occurs on the surface of form-wound coils of medium voltage electric motors. This fretting wear is a consequence of vibrations of very small amplitude that are produced, mainly, by magnetic forces; it can lead to the deterioration of the upper layer of the coil, constituted by the conductive armor coating that interacts with the slot wall of the stator. If the conductive coating becomes worn, electric partial discharges can appear inside the slot. In this work, the fretting wear phenomenon occurring between the conductive armor coating and the stator wall laminations was experimentally simulated by using a ball-on flat reciprocating tribometer. Additionally, the same configuration was used to determine the resistant to the fretting wear of the semiconductive stress grading coating, another coating applied at the coil end. The results show the friction coefficients achieved during the tests and the surface damage produced in these coatings. Since the semiconductive stress coating presents better performance against fretting wear, its shown how this coating can also be used in the section of the coil inside the slot in order to reduce the possibility of partial discharges due to the damage of the conductive armor coating.
Original languageAmerican English
Title of host publicationAnalysis of the fretting wear phenomenon on the surface coatings of form-wound coil
Number of pages9
ISBN (Electronic)9789811304101
StatePublished - 1 Jan 2019
EventLecture Notes in Mechanical Engineering -
Duration: 1 Jan 2019 → …

Publication series

NameLecture Notes in Mechanical Engineering
ISSN (Print)2195-4356


ConferenceLecture Notes in Mechanical Engineering
Period1/01/19 → …


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