Check if the bearing in the photo is lacking oil
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Bearings at the rear end of the 315kw high-voltage motor; the images may show slight discrepancies, but this does not affect the overall assessment. I would appreciate guidance from experts (the top bearing is the one that is faulty). All bearings in the images are from the motor, so they can be used for comparison. The normal color of grease is a bluish shade.
In my personal opinion, based on the picture, the possible reasons are: 1. Lack of oil, with no timely addition of lubricant； 2. The bearing itself has defects, which cause frictional heat to accumulate rapidly; this leads to the original lubricant becoming thinner and flowing out of the raceways, resulting in a lack of lubrication ； 3. Defects in installation: The bearings were not installed correctly and properly, which led to increased contact stress between the friction pairs and consequently higher frictional heat. It is not ruled out that there may be issues with the quality of the grease or that it contains impurities.
To provide some additional context about what happened at that time: when the high-voltage motor was started, smoke was observed coming from the rear air cover, so the motor was stopped immediately. After checking the starting current, it was found to be within the normal range for previous starts; therefore, it was concluded that the bearings were lacking oil. The person responsible for topping up the oil said that oil was added regularly…… In my opinion, it was still a lack of oil that caused the problem (the oil top-up wasn’t sufficient), which in turn led to faster wear and damage of the bearings
Recently, many problems have emerged simultaneously... Poor long-term equipment management has led to significant consequences... As someone with experience in equipment management, my role limits me to merely observing; I can’t get involved much, but I can share this information with everyone here
The key is to do a good job in routine maintenance. Although it may seem unimportant and the management might not be aware of it, once there are problems with the equipment, it will definitely affect production to some extent, and accountability might even be required! To do a good job in equipment maintenance, one must be willing to endure dirt and hardship, as well as able to tolerate loneliness! :lol
It might be due to a lack of oil in the bearing or a defect in the bearing
You’ve provided too little information; for example, how long has this bearing been in operation? How is the load situation? Has oil been added? Is the oil grade selected correctly? Judging from the photos, it seems that the operating time hasn’t been very long; whether the oil was cleaned before being added is also a factor that influences this.
Check the grease gun used for filling oil to ensure that there are no foreign objects in the oil passage or within the stored grease. All sorts of strange things happen. At that time, something annoying and funny happened in our workshop: due to the strong wind during the night shift, a white plastic bag was blown onto the cover of the waste liquid pump motor in the pump room. The motor sucked the plastic bag tightly to itself, which prevented proper heat dissipation and caused the motor to burn out. . .
It seems like there’s a lack of oil; the color of the bearings has changed. It’s best to add oil while the machine is running. Generally, after adding oil, the temperature of the bearings will rise slightly before dropping again.
It’s not a new bearing; the reason is likely a lack of oil