611 © The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 P. Bertoldi (ed.), Energy Effciency in Motor Systems, Springer Proceedings in Energy, https://doi.org/10.1007/978-3-030-69799-0_43 Round Robin for Converter Losses: Uniform Testing Protocol and Results from Tests in Phase 1 Conrad U. Brunner, Emmanuel Agamloh, Andrew Baghurst, Sandie B. Nielsen, and Andrea Vezzini 1 Electric Motor-Driven Systems: Effciency The complete Electric Motor-Driven System (EMDS) consists of the following four major elements: • Motor control, such as switch gear, control gear and variable frequency convert- ers (IEC 61800-9-2) [1]. • Electric motor (IEC 60034-2-1 [2], IEC 60034-30-1 [3]). • Mechanical equipment, like belts and gears (respective ISO standards from TCs 41 and 60). • Application, such as pumps fans and compressors (respective ISO standards from TCs 86, 117, 117, 118). C. U. Brunner (*) Impact Energy Inc., Zurich, Switzerland e-mail: cub@cub.ch E. Agamloh Advanced Energy, Raleigh, NC, USA e-mail: eagamloh@advancedenergy.org A. Baghurst CalTest, Port Elliot, SA, Australia S. B. Nielsen Danish Technological Institute (DTI), Taastrup, Denmark e-mail: sbn@dti.dk A. Vezzini Bern University of Applied Sciences (BFH), Bern, Switzerland e-mail: andrea.vezzini@bfh.ch