Two Minute Tips  

Electric Motor Reliability Trifecta – Training Cont’d

Noah Bethel | Vice President-Product Development, PdMA Corporation

Electric Motor Reliability Trifecta – Trending Cont’d

Keeping the focus on Trending, in Trending Part 1 we discussed qualitative trending and focused on the change in appearance. This week we switch from qualitative to quantitative trending. For analysts that like numbers, quantitative trending is the way to go. Seeing actual numbers for measurements like resistance, inductance, current, voltage, and impedance and how they have changed as compared to the last test or the last baseline is a powerful tool. If the analyst taps into resources like IEEE (The Institute of Electrical and Electronics Engineers) or EASA (Electrical Apparatus Services Association) or NEMA (National Electrical Manufacturers Association) then he or she will access many lifetimes of research into electrical test standards that further provide quantitative limits by which to make decisions from. Don’t forget to lean on your technology vendor to optimize the selection of KPIs (key performance indicators) and alarm setpoints to select for the quantitative trending of measured data. Also, remember to perform an annual review of these setpoints to keep up with changes in the industry and ensure your setpoints are not too liberal to miss a change, or too conservative causing nuisance alarms.

To listen to a discussion on trending for electric motor reliability, view our PdMA YouTube Channel at

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About the Author

Noah Bethel Vice President-Product Development, PdMA Corporation

Noah has over twenty-five years of broad operations and electrical systems maintenance experience in industrial, commercial, and military settings ranging from nuclear submarines to world class amusement parks. His experience includes high and low voltage, AC and DC, power generation, power distribution, motors, and motor controllers. Noah is currently in charge of product development for new and existing PdM technology at PdMA Corporation.

Noah is a graduate of the University of the State of New York and the Naval Nuclear Power School and Training Unit. He is a Certified Maintenance Reliability Professional, with field experience in motor circuit analysis, current signature, power analysis, thermography, vibration analysis, oil analysis and ultrasonic testing.