For the next few weeks we will post a motor reliability question for you to test your knowledge. Scroll to the end to see the correct answer.
Over a series of five AC Standard tests taken on a de-energized motor at six-month shutdown intervals, Inductive Imbalance has gradually increased from 0.2% to 13.4%. Average inductance has decreased from 22.7 mH to 16.1 mH. Which of the following faults is most likely to cause these indications?
C. Air Gap
D. Power Circuit
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The correct answer is B Stator.