Tsuyo Manufacturing Challenges Rare Earth-Free Motor Hype with Engineering Reality

Highlights

• Tsuyo Manufacturing contends there is no universal replacement for rare earth permanent magnet motors, urging engineers to prioritize physics over marketing narratives.
• NdFeB permanent magnet motors still dominate global EV production due to unmatched power and torque density; commercial-scale alternatives remain years away.
• Rare Earth Exchanges adds that supply chain resilience has become an engineering specification in the current geopolitical era, a dimension absent from Tsuyo's analysis.
• The automotive industry is actively diversifying motor architectures—including SynRM, EESM, and ferrite hybrids—but is not abandoning permanent magnets.
• Tsuyo's six-question motor selection framework is praised as a practical engineering tool, though its proprietary claims lack independent performance validation.

India's Tsuyo Manufacturing (opens in a new tab) argues in a recent paper (opens in a new tab) that the debate over "rare earth-free" versus permanent magnet motors has become distorted by marketing rather than engineering. The company correctly concludes there is no universal replacement for rare earth permanent magnet motors. Instead, engineers should select motor architectures according to packaging, weight, torque, cooling, efficiency, reliability, and total lifecycle cost—not ideology. Overall, the technical discussion is thoughtful and balanced. However, Rare Earth Exchanges® believes the analysis requires one additional dimension: in today's Great Powers Era 2.0, supply chain resilience has become, or will become, an engineering specification alongside physics.

REEx Insight: The Winning Motor Is the One You Can Actually Build

Tsuyo is right that physics has not changed. What has changed is geopolitics. Over the past year, Rare Earth Exchanges has documented a growing wave of research across the automotive industry into induction motors, synchronous reluctance motors, externally excited synchronous motors, ferrite-assisted hybrids, iron nitride concepts, and software-controlled magnetic systems. That research is real. So is the investment. And as we have gone on the record in “Automobile Supply Chain and Rare Earth Magnets—Several Years Away at Scale but Momentum,” the research to eventually pave the way to diversification is real.

What is not yet evident is a disruptive shift in commercial production. For that, we are likely years away for disruptive change to occur. Today's global EV market still relies heavily on NdFeB permanent magnet motors because they deliver unmatched power density, torque density, and efficiency in compact packages. Replacing them across mass-market automotive platforms requires redesigning power electronics, thermal systems, manufacturing lines, supplier qualification, durability testing, and vehicle architectures. That transition is measured in multiple years—not product announcements. The industry is diversifying. It is not abandoning permanent magnets.

Engineering Over Headlines

Tsuyo accurately distinguishes commercially mature motor families—including AC induction, synchronous reluctance (opens in a new tab) (SynRM), externally excited synchronous motors (opens in a new tab) (EESM), and permanent magnet BLDC/IPMSM systems (opens in a new tab)—from emerging software-defined magnetic concepts still progressing through commercial pilots. The report also correctly notes that permanent magnet motors remain the preferred solution where packaging and weight constraints dominate, while induction and SynRM frequently offer attractive rare-earth-free alternatives where space and cost permit.

Its six-question framework for selecting motor topology is perhaps the report's strongest contribution because it redirects attention from marketing narratives toward engineering tradeoffs.

Where the Story Ends—and Where It Doesn't

The report is refreshingly restrained compared with many "rare earth-free breakthrough" announcements. Nevertheless, it remains a corporate publication. Tsuyo highlights its proprietary heavy rare earth-free hybrid motor designs and variable-flux architectures but does not publish independent performance validation, manufacturing cost comparisons, durability data, or high-volume production metrics. Those claims should therefore be viewed as promising engineering developments rather than proven industry disruptors.

For investors, the larger takeaway seems straightforward enough. Over the next several years, expect diversification, not disruption. The automotive sector is actively reducing rare earth intensity where practical, but Rare Earth Exchanges' continuing research indicates that permanent magnet motors will remain central to high-performance EVs for the foreseeable future while next-generation alternatives mature through qualification, scale-up, and commercial deployment.

REEx Connect

Company: Tsuyo Manufacturing Executive: Lalit L. Baid, Co-founder & COO Technologies: AC Induction, SynRM, EESM, BLDC/IPMSM, Axial Flux, Hybrid NdFeB-Ferrite Motors, Variable-Flux Motors

Source: The Rare-Earth-Free vs Permanent Magnet Motors – Myth vs Reality (opens in a new tab) (Tsuyo Manufacturing)