A new induction motor is put into operation. The initial vibration is acceptable, but after 1 hour

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A new induction motor is put into operation. The initial vibration is acceptable, but after 1 hour of loaded operation, the 1× vibration has increased to an unacceptable level. The motor is immediately uncoupled and operated solo, and the vibration at 1× is now unacceptable as well. What is the most possible explanation?

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