Electric motor systems are estimated to account for 46% of global electricity use. Converting electrical energy to mechanical energy, they rotate pumps, drive compressors, move materials and run fans, blowers, drills or mixers. Electric motors could rightly be called the “workhorses” of industry.
For industrial applications alone, it’s estimated that electric motor systems account for approximately 70% of electricity consumption. As such huge consumers of electricity, even small improvements can lead to large energy savings.
The IEC has put in place energy efficiency classes for electric motors, known as the IE code, which are summarized in IEC International Standard: IEC 60034-30-1:2014. The Standard includes four levels of motor efficiency:
The IE codes help regulators to determine the minimum efficiency levels for electric motor energy performance in their regulations. The IEC 60034-30-1 classification system has stimulated competition among motor manufacturers and generated massive technology improvements. While IEC International Standards are voluntary, the EU (European Union) and numerous other countries have adopted the IEC classification system.
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).
Australia and New Zealand set MEPS levels for electric motors at IE2 effective since 2001.
In China MEPS for small and medium three-phase asynchronous motors to start with have been in place since 2002 (GB 18693). The standard was 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 Top runner programmed 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
This Indian Standard (Second Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Rotating Machinery Sectional Committee had been approved by the Electro technical Division Council.
This standard was first published in 1989 and revised in 2004 to include two types of energy efficiency values. This revision has been contemplated to bring it line with IEC 60034-30: 2008 ‘Rotating electrical machines — Part 30: Efficiency classes of single-speed, three-phase, cage-induction motors’, to the extent possible for efficiency classes of 3 phase squirrel cage induction motors referring to related standard IS 15999 (Part 2/Sec 1) : 2011/IEC 60034-2-1 : 2007* ‘Rotating electrical machines — Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles)’ on the methods of testing. Hence a need was felt to harmonize standard with the international practices to the extent possible.
Electric motors are the most important type of electric load in every industry. The motor driven systems Account for about seventy percent of the energy consumed by the industry. There is a large potential for cost effective solution in the use of energy efficient motor systems by about twenty to thirty percent. Electric motor systems include a number of energy using products, such as motors, drives, pumps or fans, compressors,blowers and other machines. Energy efficient motors form a major component in contributing to the energy saving by way of increased efficiency of the product itself. Therefore, attempts are being made globally to develop and implement standards specifying higher efficiency of motors and removal of lower efficiency from the standards itself. Further, with the different test methods specified in different standards, one to one comparison becomes difficult for the buyer or the end user. Therefore a need was felt globally to harmonize the motor standards with the international standards so as to have uniform test procedures to facilitate the end user to compare the performance and energy efficiency requirements.
It has to be noted that the time lines for mandatory regulations imposed in different countries to set minimum efficiency performance standards (MEPS) for general purpose motors covered under the scope of IEC 60034-30 are not far after the global harmonization of standards. Needless to say, in most of the countries, the MEPS of IE1 are already in place. With the new regulations, after June 2011, most of the major motor markets will be facing the MEPS of IE2. Hence, this standard proposes to specify IE1 motors only when used with variable frequency drives.
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