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This paper introduces a novel experimental procedure to determine the power losses in variable speed induction motors. In the first part, a two-test procedure is designed to determine each contribution to the power losses in an electric drive, in particular the iron losses. These are identified on models from international standards, as a function of the operating conditions, and compared with standard empirical relations such as the Steinmetz equations. In the second part, the resulting modelsdoi:10.3929/ethz-b-000111251 fatcat:a6zr2247kfhttcosn4xd7jkj2e