A vibration analysis on an electric motor shows s

A vibration analysis on an electric motor shows significant radial vibrations at 1x, 2x, 3x, 4x the running speed of the motor. A particularly predominant peak shows near 12,000 cpm. If the motor has 4 rotor bars and runs at 2940rpm what would you suspect the problem to be and how would you confirm your suspicions?

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    ***

    * (RPM * Nr)/60 *

    *****

    x ****** = 196

    ***

    **** frequency load-related

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