Test Your Knowledge – Part 2

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?

A. Rotor
B. Stator
C. Air Gap
D. Power Circuit

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The correct answer is B Stator.