LEESON Electric Corporation  

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 (slide 6 graphic from Schlemmer’s ppt)

Graphic showing how increased efficiency affects HP used, etc. (slide 9 and slide 35 Schlemmer ppt)

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

Standard design = induction motor

Elements of Motor Losses

  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.

US to raise Epact efficiency level to NEMA premium level by December 2010

Energy Efficiency Facts

Efficient LEESON Products


electric car
Electric Car