Electric Motor Efficiency Requirements under EPAct

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Electric Motor Efficiency Requirements under EPAct

Electric motor efficiency is a measure of how much input power a motor converts to torque and horsepower at the shaft. Efficiency is important to the operating cost of a motor and to overall energy use in our economy. It is estimated that over 60% of the electric power generated in the United States is used to power electric motors. On October 24, 1992, the U.S. Congress signed into law the Energy Policy Act (EPAct) that established mandated efficiency standards for general purpose, three-phase AC industrial motors from 1 to 200 horsepower. EPAct became effective on October 24, 1997.

% efficiency = ( power out / power in) x 100

Department of Energy
General Purpose Motors
Required Full-Load Nominal Efficiency
Under EPACT-92

Engineering Cookbook, Loren Cook Company
Department of Energy

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