Advanced Uncertainty Calculation Method for Converter-Fed Motor Loss Determining

Hannu Karkkainen, Lassi Aarniovuori, Markku Niemela, Juha Pyrhonen

Research output: Chapter in Book/Published conference outputConference publication


There is only a single practical method to determine the losses of converted-fed electrical machines. The method is based on mechanical output and electrical input power measurements. When this method is used, the loss measurement uncertainty is a function of the efficiency. The electrical motor efficiency increases non-linearly with increasing rated power. Therefore, the higher the rated power of the motor is the more care should be laid in the analysis of the efficiency measurement results. Here, a workflow starting from measurement instruments' data sheet information to final measurement uncertainty result is presented for three converted-fed induction motors with different rated power of 15 kW, 37 kW and 75 kW. The results are applicable for all rotating field machines regardless of technology.
Original languageEnglish
Title of host publication2019 IEEE International Electric Machines and Drives Conference, IEMDC 2019
Number of pages8
ISBN (Electronic)978-1-5386-9350-6
ISBN (Print)978-1-5386-9351-3
Publication statusPublished - 5 Aug 2019
Event2019 IEEE International Electric Machines & Drives Conference (IEMDC) - San Diego, United States
Duration: 12 May 201915 May 2019


Conference2019 IEEE International Electric Machines & Drives Conference (IEMDC)
Country/TerritoryUnited States
CitySan Diego


  • Efficiency
  • Electric power
  • Induction motor
  • Measurement uncertainty
  • Mechanical power


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