Mass Magnetics: USA-made magnetics for robotics and defense
Mass Magnetics recycles rare earth magnets from electric vehicle motors to produce domestically-made magnets for robotics and defense applications. The company uses a capital-efficient recycling approach that bypasses expensive mining and refining processes, extracting and processing magnets that would otherwise be discarded.
Summary
Eric Silver, a material scientist and co-founder of Mass Magnetics, discusses his company's approach to recycling rare earth magnets from electric vehicles. The company extracts magnets from EV motors and recycles them for use in robotics and defense applications, addressing critical mineral supply chain dependencies.
Silver explains that traditional domestic rare earth mining has proven prohibitively capital-intensive, requiring massive upfront investment and extensive infrastructure. Mass Magnetics instead employs a more capital-efficient approach by circumventing the need for conventional refining processes. Approximately 90% of rare earth magnet material is conventionally discarded after use, making recycling a viable solution.
The company manufactures custom magnets domestically using proprietary tooling, which Silver compares to TSMC's manufacturing approach for semiconductors. The team combines expertise in materials science, cathode production, and defense applications—Silver's background includes NSF-funded lab work, while co-founder Matt brings experience from MIT, Columbia, and Draper Labs.
Silver envisions a future where hardware recursion becomes prevalent—robot arms building robot arms—requiring closed-loop material systems where recycled magnets become the primary supply source. He anticipates that as robotic systems and motors grow exponentially (doubling annually), the waste of rare earth magnets will become economically and strategically untenable.
The technical process involves extracting magnet-containing rotors from EVs, chemically treating them to create brittleness, reducing them to powder, and then using a precision centering process to manufacture new magnets. This centering process is characterized as highly delicate and engineered, making Mass Magnetics' custom device critical to enabling efficient production.
Key Insights
- Previously attempted domestic rare earth mining proved prohibitively capital-intensive, requiring enormous upfront investment and essentially mobilizing an entire country, whereas Mass Magnetics' recycling approach avoids these capital requirements by skipping the refining process.
- Approximately 90% of rare earth magnet material from electric vehicles is conventionally thrown away, creating a massive untapped resource for recycling rather than new mining.
- The company's custom tooling for domestic magnet manufacturing is comparable to TSMC's approach for semiconductors, enabling production without the capital burden of mining and refining infrastructure.
- Silver predicts a future where hardware recursion—robot arms building robot arms—will necessitate closed-loop material systems where magnets must be recycled rather than discarded, similar to how transistor density doubles annually.
- The technical bottleneck historically existed in the refining process, which Mass Magnetics circumvents through a centering process that transforms chemically-treated magnet powder into finished magnets without conventional metallurgical refining.
Topics
Transcript
[0:00] I'm Eric Silver, co-founder of Mass Magnetics and we recycle rare earth magnets for robotics and defense. >> Wow. Okay. How'd you get into it? How does the process work? >> Sure. So, I'm a material scientist and what we do is we extract motors from EVs and recycle the magnets that are inside. Everywhere electricity is turned into motion. There's a magnet there and so inside of an EV there's a rotor that contains rare earth magnets in it. We extract them and recycle them. >> Why couldn't this have been done before? >> Previously, people have attempted mining to make rare earths domestically. And the challenge with mining is that it's super capital intensive. Like you have…
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