The efficiency describes how efficiently an electric motor transforms electrical energy into mechanical energy. Previously in Europe, low voltage three-phase motors have been graded and marketed in three efficiency classes EFF3, EFF2 and EFF1 – based on a voluntary agreement between motor manufacturers and the European Commission. This classification system is well proven and has now been adapted in many countries around the world. Unfortunately, other countries have also developed their own national systems, which are very different from the European system. That was the reason for the European motor manufacturers in ZVEI to develop an energy efficiency standard for the International Electrotechnical Commission (IEC).
The objective was to have a common international standard that replaces all the different national systems. This project was successful and the objective has been met.
The new international standard, IEC 60034-30:2008, defines efficiency classes IE1, IE2 and IE3 for three-phase motors. This ensures a common international basis for the design and classification of motors as well as for national legislative activities. At the same time, the IEC developed improved methods for determining the efficiency of these motors.
Standard IEC 60034-30:2008 defines the efficiency classes for low voltage three-phase motors with a power range from 0.75 kW to 375 kW. 'IE' stands for 'International Efficiency' and is combined with a number:
• IE1 = Standard efficiency
• IE2 = High efficiency
• IE3 = Premium efficiency
The measurement of the efficiency levels is carried out according to the procedure described in IEC 60034-2-1:2007
For additional information, please see the following ZVEI brochures.
Links:
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German brochure
•
English brochure
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www.ZVEI.org/.../Antriebe 