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

Conference · Thu Oct 01 04:00:00 EDT 2020

DOI:https://doi.org/10.1109/ECCE44975.2020.9235704· OSTI ID:1706261

Raminosoa, Tsarafidy ^[1]; Wiles, Randy ^[1]; Cousineau, Emily ^[2]; Bennion, Kevin ^[2]; Wilkins, Jon ^[1]

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1. ORNL
2. National Renewable Energy Laboratory (NREL)

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 magnet 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.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1706261
• Country of Publication: United States
• Language: English