Major energy efficiency moves for electric motors
New IE3 regulationsbring up to 50% energy savings
Geneva, Switzerland, 2015-02-12 –Globally, electric motor systems are estimated to be responsible for 46% of electricity use1. Electric motors convert electrical energy to mechanical energy; they are for example used to rotate pumps, drive compressors, lift and move materials or run fans, blowers, drills or mixers. Electric motors are the “workhorses” of industry.
For industrial applications alone,it’s estimated that electric motor systems account for approximately 70% of electricity consumption1. Being such a huge consumer of electricity, small improvements can lead to huge energy savings.
The IEC (International Electrotechnical Commission) has put in place energy efficiency classes for electric motors, known as the IE code, which are summarized in IEC International Standard:IEC 60034-30-1. The Standard includes four levels of motor efficiency:
- IE1 Standard efficiency
- IE2 High efficiency
- IE3 Premium efficiency
- IE4 Super premium efficiency.
With their help regulators are able to determine the minimum efficiency levels for electric motorenergy performance in their regulations. The IEC 60034-30-1 classification system has stimulated competition among motor manufacturers and generated massive technology improvements, and while IEC International Standards are voluntary, the EU (European Union) and numerous other countries have adopted the IEC classification system.
In the EU (Directive 640/2009) as of January 2015 for motors with a rated output from 7,5-375 kW and from 2017 for motors with a rated output from 0,75-375 kW. This measure, which is generally referred to as EU Minimum Energy Performance Standard (MEPS), is expected to result in energy efficiency improvements of 20% to 30%.
In the U.S, from 1997 (Energy Policy Act) the minimum required level was set at the equivalent of IE2. In 2007 MEPS were raised to the equivalent of the IE3 level (NEMA Premium).
In Australia and New Zealand, MEPS have been made mandatory for a range of products.Australia and New Zealand set MEPS levels for electric motors at IE2 effective since 2001.
In China MEPSfor small and medium three-phase asynchronous motors to start with have been in place since 2002 (GB 18693). The standard has been updated in 2006 and in 2012 it was harmonized with IEC Standards. At the same time the MEPS were increased from IE1 to IE2 and now IE3.
Japan has harmonized its national regulations with IEC efficiency classes and has included electric motors at the IE2 and IE3 level in its Toprunner programme in 2014.
India has a comparative efficiency label since 2009 and a voluntary national standard on IE2 level since 2012.
The IEC has also developed an International Standard IEC 60034-2-1:2014 for the testing of electric motors.
Many countries use national test standards but at the same time also reference the International Standard IEC 60034-2-1.
- Paul Waide, Conrad U. Brunner et al.: Energy-Efficiency Policy Opportunities for Electric Motor-Driven Systems, International Energy Agency Working Paper, Paris, 2011.
More information
IEC website section on energy efficiency in electric motors
IEC 60034-30-1 ed1.0
Rotating electrical machines - Part 30-1: Efficiency classes of line operated AC motors (IE code)
IEC 60034-2-1:2014
Rotating electrical machines - Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles)
TC 2 Rotating machinery
Further Information
Gabriela Ehrlich
Mob: +41 79 600 56 72 | Skype: gabriela.ehrlich | Email:
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