GM Accelerates Localized Production of EV Motor Permanent Magnets to Refine U.S. Supply Chain Layout

Reposted by Juncai Magnetic Applications; original copyright belongs to the author; see "Sources" at the end of the text for the original link.

GM Accelerates Localized Production of EV Motor Permanent Magnets to Refine U.S. Supply Chain Layout Partnering with MP Materials to Connect the Industrial Chain from Rare Earths to Motors; Magnets Produced at the Texas Factory Have Entered the Testing and Validation Phase

General Motors (GM) is accelerating the localization of core components for electric vehicles in the United States. Automotive-grade permanent magnets for EV motors have begun production in Texas, and GM is simultaneously advancing related motor testing and validation efforts.

According to a report by the electric vehicle media CleanTechnica on October 19 (local time), GM is building a localized supply chain covering rare earth mining, refining, magnet manufacturing, and motor development through its long-term partnership with critical materials company MP Materials.

Permanent magnets are one of the core components of EV motors, directly affecting motor efficiency and power density. GM currently uses an interior permanent magnet design in most of its EV motors, where the stator generates a rotating magnetic field that interacts with the magnets inside the rotor to output torque. This design helps improve efficiency, power density, and space utilization, thereby enhancing range and overall vehicle performance.

However, achieving scaled mass production of automotive-grade magnets that maintain stable performance in high-temperature, high-vibration, and high-mechanical-stress environments is not easy. GM stated that the company has adjusted the magnets used in its motors from an integral design to a segmented design to reduce heat accumulation and energy loss, further improving efficiency.

The collaboration between the two parties dates back to 2021. At that time, GM and MP Materials signed a long-term supply agreement. Back then, MP Materials operated the rare earth facility in Mountain Pass, California, which is the only large-scale rare earth mining and refining facility still operating in North America. At the same time, MP Materials was also advancing its integrated magnet business layout, and GM, as one of the early automotive customers, participated in the Independence factory project in Fort Worth, Texas.

GM stated that becoming an early customer not only helps to lock in demand in advance and collaboratively formulate long-term plans, but also promotes the project from the investment stage to industrialization and mass production through the cooperation of both technical teams. Although both parties initially expected that it would take several years from the start of the cooperation to the production of the first batch of magnets, based on the judgment of the importance of the supply chain and trust in MP Materials' strategic direction and technical capabilities, GM still decided to push forward with the cooperation.

Currently, MP Materials is already producing automotive magnets at the Independence factory. GM is applying these magnets to EV motors at its research facility in Pontiac, Michigan, and conducting testing and validation. At this point, the two parties have basically connected the key links of rare earth mining and refining in California, magnet manufacturing in Texas, and motor development and validation in Michigan. GM regards this as one of the representative cases of its "local production and local sourcing" strategy.

In terms of magnet and motor development, GM has decades of technical accumulation. The company stated that as early as the early 1980s, GM researchers led the development of high-performance permanent magnet production processes based on neodymium. Subsequently, the first-generation Chevrolet Volt improved the performance of permanent magnet motors for hybrid vehicles, and subsequent models introduced a double-V magnet layout to increase torque and reduce noise and vibration. The Chevrolet Volt EV also promoted the application of permanent magnet motor technology in mass-market EVs capable of long-distance travel.

GM emphasized that this cooperation is built on the company's more than 30 years of motor development experience and long-term magnet technology innovation. In GM's view, strengthening the supply chain cannot only focus on transaction costs; it also requires establishing long-term cooperative relationships with capable suppliers and making investment decisions during periods of uncertainty. As the cooperation continues to advance, a U.S. local supply chain from rare earth raw materials to magnets and then to motors is gradually being transformed into a real production system.

Sources

• Digital Today (2026-10-19)
• Original link: GM Accelerates Localized Production of EV Motor Permanent Magnets to Refine U.S. Supply Chain Layout
• https://www.digitaltoday.co.kr/cn/view/117090/gm-begins-producing-ev-motor-permanent-magnets-in-us-amid-supply-chain-shake-up