NdFeB Magnet Grade Optimization Boosts Modeled EV Motor Efficiency 1.84 Points: Study Finds 5.6% Range Gain

Highlights

• Researchers modeled 5,580 operating points across 24 motor designs and nine NdFeB grades, finding N52 magnets deliver the strongest individual efficiency gains.
• An integrated upgrade combining N52 magnets, better laminations and improved cooling raised modeled WLTP efficiency by 1.84 percentage points, translating to an estimated 5.6% vehicle-range increase.
• Economic crossover is estimated at 218 CNY/kg, below which N52 becomes preferable to N42 for volume EV applications, creating a potential price-performance feedback loop.
• Higher-grade NdFeB could allow automakers to extract more range per kilogram of rare-earth material, complicating simple tonnage-based demand forecasts.
• Independent validation using production EV motors and real-world drive cycles is needed before fleet-wide savings claims can be confirmed.