The outer ring and inner ring of the motor bearing are wearing out
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What are the symptoms when the outer ring or inner ring of a motor bearing wears out? What causes it?
Running on the inner ring means there is relative circumferential displacement between the rotor shaft and the inner ring of the bearing, while running on the outer ring means there is relative circumferential displacement between the outer ring and the bearing housing. The cause is mostly an inappropriate amount of interference in the interference fit.
Running on the inner circle: There is a large gap between the motor shaft and the bearing; the shaft and the inner surface of the bearing move relative to each other, and there are signs of friction. Running on the outer circle: There is a large gap between the motor bearing position and the outer surface of the bearing. The reason is usually that the quantity is too high and not enough.