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The U.S. Department of Energy (DOE ) issu ed new efficiency regulations in May 2014 [1] for integral horsepower motors effective June 2016. This article will provide an update on these new regulations for 1-500-hp low-voltage (LV) ac induction motors. The scope of coverage has been expanded to cover more configurations than in previous regulations. National Electrical Manufacturers Association (NEMA...
The U.S. Department of Energy has regulated efficiency standards for electric motors since 1992. Recently they have begun the process of creating a rule to regulate the efficiency of motor driven systems — pumps, fans and air compressors. Significant energy can be saved with more efficient systems than by regulating components alone. These regulations are expected to have wide-ranging effect on the...
The U.S. Department of Energy (DOE) issued new efficiency regulations in May of 2014 [1] for integral horsepower motors effective June 2016. This paper will provide an update on these new regulations for one (1) through 500 horsepower (HP) low voltage AC induction motors. The scope of coverage has been expanded to cover more configurations than in previous regulations. 56 frame enclosed motors are...
This paper will present various case studies of how the rotor or system natural frequencies can be strongly influenced by its external and internal factors and how small variations in these factors can influence the motor vibration at the manufacturer and in the field. Motors constructed to API 541 standards are required to have a rotordynamic lateral natural frequency that is removed from the operating...
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