Vamas Intercomparison of AC Loss Measurement: Japanese Results

Abstract

The first worldwide round robin test on ac losses was carried out, where 10 Japanese labs participated. 4 test samples, D, E, F and G, were prepared, and ac losses were measured as a function of either applied field amplitude or transport current. A variety of measurement methods were adopted, and an interim intercomparison of the results was made in terms of the hysteresis loss for 0 to 1 T field cycle as well as the coupling time constant. The standard deviation in hysteresis loss among labs including those of US and European labs so far reported was about 10 % for both high loss samples D and E. Time constants obtained among labs were in a relatively poor agreement with each other.