Two Minute Tips  

Machine Train: Pumps and Fans

Noah Bethel | Vice President-Product Development, PdMA Corporation

Machine Train: Pumps and Fans

Continuing the focus on the machine train analysis tools of the Emax Current Demodulation technology, we will discuss pumps and fans. Remember we are extracting machine train data from the current being supplied to the stator windings, which are not physically connected to the shaft line components, with the exception of minor contact from the housing through the bearings. So, we are relying on the load changes felt by the shaft, and therefore the rotor magnetic field, to be transferred through the air gap to the stator magnetic field. On an AC induction motor, the stator magnetic field and the rotor magnetic field are not turning at the same rate, and this is referred to as slip. This slip, in the form of a pole-passing frequency (Fp), becomes part of the calculation to determine which frequency range on the Emax Current Demodulation technology spectrum relates to the pumps and fans.

Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Inline Feedbacks
View all comments

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.