A recent measurement shows that your motor is operating more than 2% below its nominal, full-load efficiency. This efficiency drop may be due to the motor operating at a suboptimal load or it may be an indication of declining asset health and performance.
Electric motors are designed to run between 50% to 100% of their rated load, with peak efficiency most often occurring near 75% of rated load. Motor efficiency drops of dramatically below 50% of its rated load. If your motor is consistently operating at less than 50% of its rated load, consider downsizing the motor in this application.
If motor is operating above 50% load and showing a decline in efficiency, the motor may need service. A bearing issue or problem with the attached load may be causing additional friction and thus less productive work (output) per unit of input.
If motor was recently rewound, please update the motor’s history and nominal full-load efficiency to reflect the repair shop’s tested full-load efficiency.