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Efficient motors for air power
August 12th 2011

Unified worldwide efficiency classifications for low voltage threephase asynchronous motors are being introduced as part of an international effort to increase energy efficiency. HPC Compressed Air Systems has equipped its HPC KAESER screw compressors with premium efficiency motors in accordance with these standards

The efficiency of an electric motor is defined as the ratio of usable mechanical power to electric input power. In Europe, low-voltage three-phase motors were previously divided into EFF3, EFF2 and EFF1 efficiency classifications. Differences among various national systems with regard to scope and classification prompted the International Electrotechnical Commission (IEC) to develop a unified standard. In parallel, the IEC's improved methods for determining efficiency were revised and standardised. The new IEC 60034-30 standard defines and harmonises IE1, IE2 and IE3 efficiency classifications for lowvoltage three-phase motors worldwide.

Former classifications

The voluntary agreement between the European Committee of Manufacturers of Electrical Machines and Power Systems (CEMEP) and the European Commission, in effect since 1998, defined three efficiency classifications:

EFF3 = Standard efficiency motors

EFF2 = Improved efficiency motors

EFF1 = High efficiency motors

The minimum values for the various classifications were based on efficiency measurements in accordance with EN60034-2:1996.

New procedure for determining efficiency

The EN 60034-2-1:2007 standard introduces new procedures for measuring the efficiency of low voltage three phase asynchronous motors, which has led to considerably greater precision under defined laboratory conditions. It replaces the former EN 60034-2:1996 standard.

The old standard ceased to be valid in November 2010. A direct comparison of the two standards on the same motor shows that efficiencies measured using the new procedures are a few percentage points lower than those measured using the old standard.

New international efficiency classifications for motors

The new EN 60034-30:2009 standard defines the following worldwide efficiency classifications for low voltage three phase asynchronous motors rated from 0.75 to 375kW:

� IE1 = Standard efficiency (equivalent to EFF2)

� IE2 = High efficiency (equivalent to EFF1)

� IE3 = Premium efficiency

Implementation of the Ecodesign Directive 2005/32/EC (EuP Directive) is intended to proceed according to the following schedule:

� From 16.06.2011 � Minimum IE2 efficiency for asynchronous motors rated 0.75 to 375kW

� From 01.01.2015 � Minimum IE3 efficiency for motors rated 7.5 to 375kW, or a combination of frequency convertor and IE2 motor

� From 01.01.2017 � Minimum IE3 efficiency for motors rated 0.75 to 375kW, or a combination of frequency convertor and IE2 motor.

Energy saving

Close cooperation with its electric motors partner, Siemens, has enabled HPC KAESER to equip virtually all of its screw compressor ranges with equally sized IE3 motors. The SK Series of compressors has been equipped with these energy-efficient units. The remaining screw compressor ranges will follow suit through 2011, well before the standard becomes mandatory, providing customers with energy efficiency and costeffective compressed air generation.

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