Electric motor efficiency

The new standard EN 60034-30:2009 defines the efficiency classes IE1, IE2, IE3, IE4 and IE5 for low-voltage three-phase AC motors. The IEC 60034-2-1:2007 standard also introduced new methods for measuring the efficiency of low-voltage three-phase AC motors. This leads to a more precise determination of the additional losses. The better the efficiency class, the more expensive the production of the motors. In relation to the motor service life, however, the acquisition costs are only a few percentage points and are amortised in a short time through the energy costs saved.

The most important key points at a glance:

- EU-wide standardised efficiency classes
- Scope for low-voltage three-phase AC motors from 0.75 to 1000 kW
- 50 Hz and 60 Hz motors
- 2, 4, 6 and 8 pole speeds
- Operating mode S1 and S3 >79%
- Designations:
iE1=Standard efficiency
iE2=High efficiency
iE3=Premium efficiency
iE4=Super Premium Efficiency
IE5=Ultra Premium Efficiency

Here is an extract of the statutory minimum efficiency levels:

- From 1 June. 2021, three-phase motors from 0.75 kW to 1000 kW must be at least IE3 efficient. Similarly, electric motors from 0.12 kW to 0.55 kW must be manufactured to at least efficiency class IE2.

- From 1 July. 2023, at least efficiency class IE4 will be required for electric motors in 2/4/6 pole versions from 75 kW to 200 kW. Similarly, from this period, single-phase motors from 0.12 kW will be required to have at least efficiency class IE2.

New regulation

Here is the corresponding link regarding theregulation (EU)1781 of 1 October 2019.

Calculate savings:

You can calculate the savings potential of the new motors with ourEnergy saving calculator calculator.

SEO=Electric motor efficiency E1, IE2, IE3, IE4, IE5