公开(公告)号：US20240044449A1

公开(公告)日：2024-02-08

申请号：US18257634

申请日：2020-12-22

Applicant: ABB Schweiz AG

Inventor： Panagiotis Kakosimos ,  Olli Alkkiomäki ,  Teija Aaltonen

IPC: F16N29/00 ,  G01N33/28

CPC classification number: F16N29/00 ,  G01N33/2888 ,  F16N2250/08 ,  F16N2210/14 ,  F16N2210/18

Abstract: A method of detecting degradation of a lubricant in a bearing of an electrical machine, including: a) obtaining a first outer bearing ring temperature, b) changing the speed of the electrical machine, c) obtaining a second outer bearing ring temperature when the speed has changed, d) determining a thermal response value of the outer bearing ring based on the first outer bearing ring temperature and the second outer bearing ring temperature, e) comparing the thermal response value with a reference thermal response value for the same speed change as in step b), and f) in case the thermal response value differs from the reference thermal response value, concluding that the performance of the lubricant has degraded.