Hybrid rotor multiple magnets (HRMM) design for traction motors

line graph shows Speed-Torque Characteristics — Speed-Torque Characteristics

CMI researchers at Ames National Laboratory conducted the research for this highlight

Innovation
A Hybrid Rotor Multiple Magnets (HRMM) design is proposed to reduce the use of rare earth elements in electric vehicles, while maintaining comparable performance with a commercial design.

Achievement

Substitutes 50% of Nd-Fe-B magnet in 2010 Toyota Prius with ferrite magnet.
Maintains comparable speed-torque characteristics with original Prius 2010 design.
HRMM offers a higher torque/$, compared to the original design.

Significance and impact

Addresses potential shortages in critical rare earths.
Enables sustainable vehicle electrification.

Hub Goal Addressed
Reduction of critical RE magnets usage in EV motors.

https://link.springer.com/article/10.1007/s11837-022-05594-5

bar graph shows Peak Torque and Torque/$ Comparison — Peak Torque and Torque/$ Comparison