Motor Case
Invalid Case
20190906 Application Case: A customer in the motor industry reported that their end‑user experienced abnormal noise immediately upon startup. The motor is equipped with two sets of 6203‑2RS bearings.
According to testing by our company’s technical personnel, all dimensional measurements are within specifications; only the noise level exceeds the standard. The detailed analysis is as follows:
1: The customer brought back the bearing from the site, as shown in the photo: its exterior shows no obvious signs of installation or wear; when rotating the bearing, there is noticeable binding, and the noise level is elevated, leading to a preliminary assessment that the raceway is damaged.
2: After prying open the bearing cover, a distinct, irritating odor was detected; the grease near the outer race had discolored (turned yellow), though it had not yet completely lost its lubricating performance.
3: Internal Condition
Draw a conclusion
Due to equipment leakage, current passes through the bearing, creating a potential difference between the outer and inner rings. This causes breakdown of the lubricant film, leading to electrical erosion. Electrical erosion, along with impurities and raceway defects, results in fretting wear during radial micro‑motion operation.
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