Slip Torque Investigation and Magnetic Redesign of Motor Integrated Permanent Magnet Gear

Tommy Vestergaard Frandsen, Peter Omand Rasmussen

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

14 Citations (Scopus)

Abstract

This paper presents an investigation of 20% difference between the measured and calculated slip torque of a Motor Integrated Permanent Magnet Gear (MIPMG) prototype. The High Speed (HS) side of the Magnetic Gear (MG) was fixed by loading the motor when conducting the slip torque measurement. Suspicion of the motor saturating before the MG reached peek torque and thus measuring the maximum torque of the motor instead, made the method questionable. The MIPMG has been modified to lock the HS side of the MG mechanically and new measurements have been conducted but with the same low slip torque as result. It was realized that some magnets most likely are partly demagnetized due to an inappropriate magnetic design which can explain the measured slip torque to be lower than the results from static 2 and 3D FEA. With the discovered demagnetization and several years of experience with the technology, the MIPMG is theoretical redesigned and semi optimized regarding the use of magnet material while maintaining a reasonable torque density and high efficiency.
Original languageEnglish
Title of host publication18th International Conference on Electrical Machines and Systems (ICEMS) 2015
Number of pages7
PublisherIEEE Press
Publication dateOct 2015
Pages929 - 935
ISBN (Electronic)978-1-4799-8805-1
DOIs
Publication statusPublished - Oct 2015
Event18th International Conference on Electrical Machines and Systems (ICEMS) 2015 - , Thailand
Duration: 25 Oct 201528 Oct 2015

Conference

Conference18th International Conference on Electrical Machines and Systems (ICEMS) 2015
Country/TerritoryThailand
Period25/10/201528/10/2015

Keywords

  • Slip torque;
  • Rotational losses
  • Eddy current loss
  • Magnet Gear
  • Prototype
  • Demagnetization
  • FEA
  • Build factor

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