AEMT - Association of Electrical and Mechanical Trades

IE Motor Efficiency Level Tolerances

The following are the Eco Design Directive Details:

The definitions in the Eco-design directives, IEC640/2009 and amended by EU directive 4/2014 on 27th July 2014 for Motors includes the following design requirements:

  • Electric, single speed, three phase induction motors.
  • Hertz: 50 or 50/60Hz
  • Squirrel cage i.e. no brushes, commutators, slip rings, or electrical connections to the rotor.
  • Poles: two to six pole (2, 4, or 6 pole.) Single speed only.
  • Rated voltage up to 1000v.
  • Rated output P N between 0.75kW and 375kW.
  • Rated for continuous operation. Capable of operating with an integrated cooling system, at nominal load, without interruption, below its maximum temperature rise, as per S1.
  • Brake motor means equipped with an electromechanical brake unit operating directly on the motor shaft without couplings.
  • These Directives shall not apply to means of transport for persons or goods, and design requirements for machines outside the above parameters.
The following table highlights the changes of the Eco Design Requirements for Electric Motors:

Before 27 July 2014
this regulation shall not apply to:
After 27 July 2014
this regulation shall not apply to:
means of transport for persons or goods means of transport for persons or goods (no change)
motors specified to operate wholly immersed in a liquid motors specified to operate wholly immersed in a liquid (no change)
motors completely integrated into a product (for example gear, pump, fan or compressor) of which the energy performance cannot be tested independently from the product motors completely integrated into a product (for example gear, pump, fan or compressor) of which the energy performance cannot be tested independently from tvhe product (no change)
motors specifically designed to operate at altitudes exceeding 1,000 meters above sea level motors specified to operate exclusively at altitudes exceeding 4,000 meters above sea level
motors specifically designed to operate where ambient air temperature exceeds 40°C motors specified to operate exclusively where ambient air temperature exceeds 60°C
motors specifically designed to operate in maximum operating temperatures above 400°C motors specified to operate exclusively in maximum operating temperatures above 400°C
motors specifically designed to operate where ambient air temperatures are less than -15°C for any motor... motors specified to operate exclusively where ambient air temperatures are less than -30°C for any motor...
or less than 0°C for a motor with air cooling or less than 0°C for a motor with water cooling
motors specifically designed to operate where the water coolant temperature at the inlet to a product is less than 5°C or exceeding 25°C motors specified to operate exclusively where the water coolant temperature at the inlet to a product is less than 0°C or exceeding 32°C
motors specifically designed to operate in potentially explosive atmospheres motors specified to operate exclusively in potentially explosive atmospheres
brake motors, except requirements laid out in Annex 1 points 2(3) to (6) and (12) brake motors, except requirements laid out in Annex 1 points 2(3) to (6) and (12)

The relevant dates are:

Directive Mandatory Dates: Motors with a Rated kW from: Shall not be less efficient than
16 June 2011: 0.75kW to 375kW. IE2 efficiency level
27 July 2014: As Above Design Amendments as above, and in the amendment chart.
1 January 2015: 7.5kW to 375kW IE3 Efficiency level, Or IE2 equipped with a VSD. (Variable Speed Drive)
1 January 2017: 0.75 kW to 375kW IE3 Efficiency level, Or IE2 equipped with a VSD. (Variable Speed Drive)

Energy Efficient motors replacing original motors on fans, pumps, and compressors, will have less slip and therefore have a higher maximum speed. This could lead to higher energy usage unless regulated back to the original speed or re-profiling the impellor to compensate. Specialist advice should be considered. Standard energy efficient motors may not be a suitable replacement for high torque machines, stop start machines, brake motors, low usage machines, and other special fitments or applications.

Rewinds:

A good repair or rewind by an AEMT member using the latest specification winding wire and insulation systems and good quality bearings will maintain, and often improve, the efficiency of a motor within its original rated efficiency level band  (see the AEMT EASA Good Practice Guide).

Tolerances for Efficiency Levels

To comply with the regulation on nominal motor efficiency (η), the losses (1-η) should not vary by more than 15 % on power range 0.75-150 kW and 10 % on power range > 150-375 kW.

PN

kW

2 Pole 4 Pole 6 Pole 8 Pole
IE1 IE2 IE3 IE4 IE1 IE2 IE3 IE4 IE1 IE2 IE3 IE4 IE1 IE2 IE3 IE4
0.12 45.0 53.6 60.8 66.5 50.0 59.1 64.8 69.8 38.3 59.1 57.7 64.9 31.0 39.8 50.7 62.3
0.18 52.8 60.4 65.9 70.8 57.0 64.7 69.9 74.7 45.5 64.7 63.9 70.1 38.0 45.9 58.7 67.2
0.20 54.6 61.9 67.2 71.9 58.5 65.9 71.1 75.8 47.6 65.9 65.4 71.4 39.7 47.4 60.6 68.4
0.25 58.2 64.8 69.7 74.3 61.5 68.5 73.5 77.9 52.1 68.5 68.6 74.1 43.4 50.6 64.1 70.8
0.37 63.9 69.5 73.8 79.1 66.0 72.7 77.3 81.1 59.7 72.7 73.5 78.0 49.7 56.1 69.3 74.3
0.40 64.9 70.4 74.6 78.9 66.8 73.5 78.0 81.7 61.1 73.5 74.4 78.7 50.9 57.2 70.1 74.9
0.55 69.0 74.1 77.8 81.5 70.0 77.1 80.8 83.9 65.8 77.1 77.2 80.9 56.1 61.7 73.0 77.0
0.75 72.1 77.4 80.7 83.5 72.1 79.6 82.5 85.7 70.0 79.6 78.9 82.7 61.2 66.2 75.0 78.4
1.10 75.0 79.6 82.7 85.2 75.0 81.4 84.1 87.2 72.9 81.4 81.0 84.5 66.5 70.8 77.7 80.8
1.50 77.2 81.3 84.2 86.5 77.2 82.8 85.3 88.2 75.2 82.8 82.5 85.9 70.2 74.1 79.7 82.6
2.20 79.7 83.2 85.9 88.0 79.7 84.3 86.7 89.5 77.7 84.3 84.3 87.4 74.2 77.6 81.9 84.5
3.00 81.5 84.6 87.1 89.1 81.5 85.5 87.7 90.4 79.7 85.5 85.6 88.6 77.0 80.0 83.5 85.9
4.00 83.1 85.8 88.1 90.0 83.1 86.6 88.6 91.1 81.4 86.6 86.8 89.5 79.2 81.9 84.8 87.1
5.50 84.7 87.0 89.2 90.9 84.7 87.7 89.6 91.9 83.1 87.7 88.0 90.5 81.4 83.8 86.2 88.3
7.50 86.0 88.1 90.1 91.7 86.0 88.7 90.4 92.6 84.7 88.7 89.1 91.3 83.1 85.3 87.3 89.3
11.00 87.6 89.4 91.2 92.6 87.6 89.8 91.4 93.3 86.4 89.8 90.3 92.3 85.0 86.9 88.6 90.4
15.00 88.7 90.3 91.9 93.3 88.7 90.6 92.1 93.9 87.7 90.6 91.2 92.9 86.2 88.0 89.6 91.2
18.50 89.3 90.9 92.4 93.7 89.3 91.2 92.6 94.2 88.6 91.2 91.7 93.4 86.9 88.6 90.1 91.7
22.00 89.9 91.3 92.7 94.0 89.9 91.6 93.0 94.5 89.2 91.6 92.2 93.7 87.4 89.1 90.6 92.1
30.00 90.7 92.0 93.3 94.5 90.7 92.3 93.6 94.9 90.2 92.3 92.9 94.2 88.3 89.8 91.3 92.7
37.00 91.2 92.5 93.7 94.8 91.2 92.7 93.9 95.0 90.8 92.7 93.3 94.5 88.8 90.3 91.8 93.1
45.00 91.7 92.9 94.0 95.0 91.7 93.1 94.2 95.4 91.4 93.1 93.7 94.8 89.2 90.7 92.2 93.4
55.00 92.1 93.2 94.3 95.3 92.1 93.5 94.6 95.7 91.9 93.5 94.1 95.1 89.7 91.0 92.5 93.7
75.00 92.7 93.8 94.7 95.6 92.7 94.0 95.0 96.0 92.6 94.0 94.6 95.4 90.3 91.6 93.1 94.2
90.00 93.0 94.1 95.0 95.8 93.0 94.2 95.2 96.1 92.9 94.2 94.9 95.6 90.7 91.9 93.4 94.4
110.00 93.3 94.3 95.2 96.0 93.3 94.5 95.4 96.3 93.3 94.5 95.1 95.8 91.1 92.3 93.7 94.7
132.00 93.5 94.6 95.4 96.2 93.5 94.7 95.6 96.4 93.5 94.7 95.4 96.0 91.5 92.6 94.0 94.9
160.00 93.8 94.8 95.6 96.3 93.8 94.9 95.8 96.6 93.8 94.9 95.6 96.2 91.9 93.0 94.3 95.1
200.00 94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.3 92.5 93.5 94.6 95.4
250.00 94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.5 92.5 93.5 94.6 95.4
315.00 94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.6 92.5 93.5 94.6 95.4
355.00 94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.6 92.5 93.5 94.6 95.4
400.00 94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.6 92.5 93.5 94.6 95.4
450.00 94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.6 92.5 93.5 94.6 95.4
500 to
1000
94.0 95.0 95.8 96.5 94.0 95.1 96.0 96.7 94.0 95.1 95.8 96.6 92.5 93.5 94.6 95.4