Welcome to the forum.
Could very well be motor bearing noise. However, something else, could be air in the pump basket. If you are sucking air into the system that will make quite a bit of noise too. To check, drain the pump basket, this could be as simple as opening the lid and letting the water drain back through the skimmer, then fire the pump for a few seconds, dry, and see if the noise is the same. If it is, then the bearings are the most likely suspect. Sometimes bearings just get noisy and don't fail for a long time.
Al
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