At the highest license class, you're not just monitoring motors someone else selected — you're expected to evaluate whether a motor is correctly applied to its load, and to understand how the way your facility uses electricity, not just how much, affects the bill. This guide covers motor sizing and selection methodology and power factor, the two most consequential "behind the meter" electromechanical topics for a senior operator or plant supervisor.
Motor Sizing and Selection Methodology
Selecting the right motor for a pump, blower, or mixer application goes well beyond matching horsepower to a nameplate rating on the driven equipment. A thorough sizing evaluation considers:
- Load torque-speed characteristics vs. motor torque-speed curve. Different driven loads demand torque differently across the speed range as they accelerate from standstill to full speed. Centrifugal pumps