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Energy Efficiency Facts


Electric motor systems account for 23 percent of all electricity consumed in the United States and almost 70 percent of manufacturing sector electricity consumption. – Motor Decisions Matter

A motor’s initial purchase price represents only 2 percent of its total lifetime cost. A motor’s power usage represents almost 98 percent of its total lifetime cost.

World Energy Consumption


Inefficient Motors Contribute to Global Warming


By increasing a motor's efficiency from 65% to 80%, you will not only decrease the amount of CO2 released into the atmosphere, but reduce the Megawatt hours used at a facility.


Previously, increasing horsepower in small frame sizes (T vs. U frame) by raising temperature rise (class A, B, F and H rise)

Standard design today is the induction motor (allowing you to put a bigger motor in a smaller package). This saves room but the tradeoff is that the motor is running hotter. Older motor designs ran cooler but were very inefficient.

Elements of Motor Losses - 5 ways to reduce motor efficiency

  1. Stator I2R Losses – conductor heating losses

  2. Rotor I2R Losses – conductor heating losses

  3. Friction & Windage – bearing and fan losses

  4. Core Losses – steel lamination losses in stator and rotor

  5. Stray Losses – all other losses such as rotor surface losses, stator surface losses, tooth pulsation losses, skew leakage flux losses, etc.

Epact raised the bar on standard efficiency products, requiring more copper and steel. NEMA Premium raised the bar again, requiring more copper and steel.

The most traditional way to raise efficiency levels has been to add more copper and steel to have the designs run cooler and more efficiently.

U.S. to raise Epact efficiency level to NEMA premium level by December 2010 with new rules for small motors taking effect in March of 2015. To learn more about the new standards, visit Motor Decisions Matter's website.  www.motorsmatter.org

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