Highlights

• University of Warwick study reveals recycled neodymium magnets deliver nearly identical performance to newly mined materials with only ~3% design adjustments, offering a breakthrough solution to reduce China-dominated rare earth supply chain dependencies.
• Advanced simulations compared three motor types (PMSM, PMaSynRM, WFSM) using virgin, recycled, and ferrite magnets, finding that ferrite alternatives require up to 82% larger motors while magnet-free systems suffer from higher energy losses.
• Research underscores that eliminating rare earths entirely remains technologically challenging, but scaling recycling infrastructure presents the most realistic path to reducing costs and supply risks without sacrificing EV motor performance.

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A new study led by Oliver Mitchell Lee and Dr. Mohammadali Abbasian of the University of Warwick (Warwick Manufacturing Group (opens in a new tab)), published in Energies (2025), tackles one of the most urgent bottlenecks in the global energy transition: dependence on rare earth magnets in electric vehicles (EVs). Using advanced simulations, the researchers compared conventional rare-earth-heavy motors with alternative designs using recycled magnets, ferrite substitutes, and even magnet-free systems. Their core finding is striking: recycled neodymium (NdFeB) magnets can deliver nearly the same performance as newly mined materials with only minor design changes, while significantly lowering costs and supply chain risk. Meanwhile, fully rare-earth-free designs are viable but come with meaningful performance trade-offs—highlighting both a pathway forward and the limits of current technology.

Study Methods: Simulating the Future of Electric Motors

The research used industry-standard simulation software (Ansys Motor-CAD) to model three motor types: the dominant permanent magnet synchronous motor (PMSM), a reduced-magnet alternative (PMaSynRM), and a magnet-free wound-field machine (WFSM). Each was tested with different materials—virgin rare-earth magnets, recycled magnets, and ferrite substitutes—under identical operating conditions. Performance metrics included torque, efficiency, heat, durability, and cost, offering an “apples-to-apples” comparison rarely seen in this field.

Key Findings: Recycling Emerges as the Breakthrough

The headline result: recycled rare earth magnets performed nearly identically to new ones, requiring only ~3% design adjustments to match torque output. They also showed better resistance to performance loss under stress. In contrast, ferrite magnets—while cheaper and more abundant—required significantly larger motors (up to 82% bigger), reducing efficiency and power density.

Magnet-free systems (WFSM) stood out for cost and supply security, but suffered from higher energy losses and engineering complexity. The traditional PMSM still delivered the best raw performance, reinforcing why it dominates today’s EV market.

Implications: Supply Chains, Not Just Science

For investors and policymakers, the implications are profound. Recycling could reduce dependence on China-dominated rare earth supply chains without sacrificing performance—potentially reshaping the midstream bottleneck. However, the study also underscores a hard truth: eliminating rare earths entirely remains technologically and economically challenging at scale.

Limitations and Controversies

The study is simulation-based, not experimental, meaning real-world performance could differ. Cost estimates are also modeled rather than market-verified. Additionally, recycling technologies remain immature at an industrial scale, raising questions about feasibility despite promising results.

What Comes Next

The authors call for large-scale recycling infrastructure, improved magnet recovery methods, and further research into rare-earth-free materials like iron nitrides. For now, the most realistic path forward is not eliminating rare earths—but using them far more efficiently.

Citation: Lee, O.M.; Abbasian, M. Reducing Rare-Earth Magnet Reliance in Modern Traction Electric Machines (opens in a new tab). Energies 2025, 18(9), 2274.