Advanced Electric Machines (AEM), the UK-based developer of rare-earth-free electric motors, has signed on an additional development partner as it works to commercialize magnet-free drive units for the automotive market. The company confirmed the expanded collaboration this week, though it did not disclose the partner's name, the financial terms, or the program timing attached to the agreement.

The announcement matters for one reason: rare earths. Permanent-magnet motors in today's battery-electric vehicles rely heavily on neodymium, and to a lesser extent dysprosium and terbium, materials sourced predominantly from China. Export controls Beijing imposed on gallium, germanium and graphite over the past two years have pushed every major OEM and Tier 1 supplier to qualify alternatives. Magnet-free motor architectures — switched reluctance, synchronous reluctance and externally excited designs among them — are the leading candidates.

AEM positions itself in that race. The company's approach dispenses with rare-earth magnets entirely, which in principle removes both the supply-chain exposure and the price volatility that come with them. Whether that translates into series production depends on the usual trade-offs: magnet-free designs have historically trailed permanent-magnet motors on power density and efficiency, the two metrics that decide range per kilowatt-hour.

The new partner joins an existing development network around AEM. The company has previously worked with automotive and industrial players on qualifying its motor technology, and it has operated programs aimed at both passenger-vehicle traction motors and secondary applications. Details on which segments the latest partnership targets were not part of the announcement.

For purchasing departments at OEMs, the claim to verify is straightforward: does a rare-earth-free motor from AEM — or any supplier — match permanent-magnet performance at a competitive cost per unit when scaled to vehicle volumes? Announcements of development partnerships are intentions, not capacity plans. No plant allocations, tooling investments or job numbers accompanied this one.

The policy backdrop nonetheless keeps pressure on the technology. EU critical-raw-materials legislation and US Inflation Reduction Act sourcing rules both penalize supply chains that run through dominant single-country processors. Motors that eliminate rare earths sidestep that exposure altogether, which is why several OEMs have announced magnet-free or reduced-rare-earth motor programs for vehicles launching later this decade.

What to watch next: whether AEM names the new development partner and the application segment involved, whether the collaboration produces a series-production nomination from an OEM or Tier 1, and the first published efficiency and power-density figures for AEM's design benchmarked against neodymium-based traction motors.