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EMSA Newsflash - December 2022 - www.iea-4e.org/emsa
Dear ,
Welcome to the latest Newsflash of the 4E Electric Motor Systems Annex (EMSA). We would like to share with you an interesting report which has just been released!
Almost all converters on the market easily reach IE2

An international test programme provided key evidence for the design of an updated and robust test procedure and provided sufficient data to correct the current reference values for converter losses.

EMSA organised an international round robin testing programme for converters in cooperation with IEC SC22G/WG18, to support the revision of IEC 61800-9-2 with science-based evidence.

The Report on Round Robin of Converter Losses has just been released, summarising the results of the international testing programme. During the round robin, 8 laboratories performed a total of 179 tests on 57 different converters with a power range between 0.12 to 55 kW.

Figure 1: IE-index for 3-phase Basic Drive Modules (converters) over nominal output current at (90:100) duty point. Dotted line is the threshold between IE2 (below) and IE1 (above). 
Key findings:
  • The measured converter losses were all less than 30% to 50% of the reference losses of IE1 and therefore well below the margin for the highest IE class for converters (IE2). Therefore, almost all converters on the market are within the IE2 class, see Figure 1.
  • The test results show a very good match between manufacturer catalogue data and measured data using the input-output method. Assuming that most manufacturer data are calculated and not measured, such an alignment is to be judged positively. Nevertheless, most manufacturers will not completely disclose the assumptions and parameters for their calculations, so that an independent third-party recalculation is not possible.
  • Modifications to the test method in the second revision of IEC 61800-9-2 were based on the Uniform Testing Protocol, elaborated as part of the Round Robin.
  • The correction factors for converters (Complete Drive Modules) with modified functionality tend to slightly overcompensate the additional losses. In extremis this means, that adding a sinusoidal current output filter could shift the converter’s IE class from IE1 into IE2.
Download report

We wish you a nice holiday season and all the best for the New Year!

Best regards,

Maarten van Werkhoven
EMSA Operating Agent

TPA advisors
+31 (0)23 536 80 90

Rita Werle
EMSA Vice-Operating Agent

Impact Energy Inc.
+41 (0)44 226 20 10

EMSA is the Electric Motor Systems Annex of the International Energy Agency's Technology Collaboration Programme on Energy Efficient End-use Equipment 4E. Currently Australia, Austria, Denmark, European Commission, Netherlands, New Zealand, Sweden, USA and Switzerland participate actively in EMSA. Canada, China, France, Japan, Korea,  and the United Kingdom participate in other 4E Annexes.

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IEA 4E Electric Motor Systems Annex (EMSA)
Gessnerallee 38a, 8001 Zurich, Switzerland, +41 (0)44 226 20 10