I would like to ask the experts: what are the reasons for a sudden increase in bearing temperature followed by its return to normal levels?
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Last night, the temperature of the ZQ series sliding seat bearings between this synchronous motor and the exciter rose from 50 degrees to over 80 degrees within a few minutes, before gradually returning to 50 degrees (as shown by the graphs on the computer); and multiple on-site measurements today have also shown a temperature of 50 degrees! During normal operation, it’s around 50 degrees! Dear experts, what is the cause of this situation? The lubricating oil inside was also replaced with new oil in September! The oil level is also normal! There is no oil circulation outside either!
It is recommended to upload the trend chart for discussion. If there is a time delay in the rising process, it indicates that there is a problem with the bearing. Bearings are divided into sliding bearings and rolling bearings; it is not inevitable that bearing damage will lead to an increase in bearing temperature. It is recommended to provide a detailed description of the relevant bearing types and lubrication methods to facilitate discussion. For reference.
It might be caused by lubricant scaling on the shaft