IE (International Efficiency) classes indicate a motor's energy-efficiency level according to the IEC 60034-30-1 standard. IE4 stands for "super premium" and IE5 for "ultra premium" efficiency; IE5 is the highest class defined today. A higher IE class simply means the motor does the same work with less electricity.

How are IE classes defined?

IEC 60034-30-1 sets efficiency classes for single- and three-phase induction motors supplied directly from the grid, with separate limits depending on rated power, number of poles and frequency. The classes are ranked as follows:

  • IE1 – Standard efficiency
  • IE2 – High efficiency
  • IE3 – Premium efficiency
  • IE4 – Super premium efficiency
  • IE5 – Ultra premium efficiency

Each higher class is achieved by noticeably reducing the motor's losses (copper, iron, friction and windage losses) compared with the class below. Efficiency values are determined with the test methods described in IEC 60034-2-1, so motors from different manufacturers can be compared on the same basis.

How do IE4 and IE5 motors achieve higher efficiency?

More and better copper, low-loss electrical steel, optimised rotor and fan design and tight manufacturing tolerances all reduce losses. The IE5 level is mostly reached with permanent-magnet or synchronous reluctance technology, and such motors are usually operated together with a frequency inverter.

Impact on your operation

A higher efficiency class lowers operating costs, reduces environmental impact and makes compliance with the European Union Ecodesign regulations easier. The difference becomes clear on pumps, fans and compressors that run for long hours. DRG Motor supplies high-efficiency motors from IE3 to IE5.

To choose the right efficiency class for your application, reach us on +90 (542) 666 11 11 (WhatsApp) or at info@drgmotor.com.