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Low Power Factor


Power Factor (PF) is a measurement that can quickly determine the amount of load on a motor. Motors are designed to operate between 50 & 100% of rated load. Most motors’ best operating efficiency is around 75% of rated load.

Typically, motors with low power factor during normal operation are over-sized for that application and will cost more to operate than a more correctly-sized motor.  Motors operating with low power factor will contribute to low system power factor, which could result in high power factor charges by utilities and also create higher energy loss within the motor. Using power factor to correctly size motors in the plant will result in increased electrical reliability and less wasted energy.

Municipal Utility District Reduces Energy Demand Penalties and Implements Condition Based Monitoring Program


Electrical Signature Analysis (ESA) evaluates both voltage and current, thereby giving a broad view of motor system health including incoming power quality.  Combining this information with knowledge of the application can indicate opportunities for energy cost savings.


  1. What is the technical reason why we need to have a motor shall be design to operate not less than .85 power factor?
    Do we need to use all motor are design to operate not less than .85 power factor or equal to 1 or as close as possible?


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