A High-Speed High-Power-Density Non-Heavy Rare-Earth Permanent Magnet Traction Motor: Preprint

Tsarafidy Raminosoa, Randy Wiles, J. Emily Cousineau, Kevin Bennion, Jon Wilkins

Research output: Contribution to conferencePaper


There has been a global push for higher torque density and lower cost traction motors. The use of non-heavy rare-earth (non-HRE) permanent materials in traction motors are being investigated for the sustainability, profitability and affordability of electric vehicles and to broaden their adoption. A 20,000-rpm permanent magnet traction motor using non-HRE magnet materials is proposed. A dual three phase winding configuration driven by a segmented dual three phase drive is proposed to reduce the current ripple and as a result the DC Link capacitor, as well as to ease the voltage constraint at high speed and eliminate any risk of uncontrolled regeneration. Furthermore, the dual winding configuration enables a fault tolerant design which is useful for reliability. The paper presents comprehensive electromagnetic, thermal and mechanical designs and analyses using an integrated approach. The results have shown that the design is robust against demagnetization and confirmed its thermal and mechanical viability.
Original languageAmerican English
Number of pages10
StatePublished - 2020
EventIEEE Energy Conversion Congress and Exposition (ECCE) -
Duration: 11 Oct 202015 Oct 2020


ConferenceIEEE Energy Conversion Congress and Exposition (ECCE)

Bibliographical note

See NREL/CP-5400-78713 for paper as published in proceedings

NREL Publication Number

  • NREL/CP-5400-75994


  • electric machine
  • energy efficiency
  • thermal management
  • vehicles


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