Electric motors with no rare earths (renaultgroup.com)

Article summary

Renault Group has been developing electric motors without rare earths, using electrically excited synchronous motors (EESM) instead of permanent-magnet synchronous motors. This technology has been used in various Renault models since 2011 and is expected to continue with the next generation of EESM motors in 2027. The new motors will have a higher output of 200 kW and reduced carbon impact. Renault's approach aims to avoid reliance on countries that produce rare earths, such as China.

Main themes

• Electric motors
• Rare earths
• Sustainability
• Automotive technology
• Global supply chains
• Electric vehicles

What commenters say

• Replacing permanent magnets with electromagnets in electric motors is a viable alternative to reduce reliance on rare earths.
• The use of EESM motors may consume more electricity, but the excitation power is a small fraction of the total power consumption.
• Some commenters argue that AC induction motors are a more efficient and reliable option, while others point out their limitations in terms of power density and efficiency.
• The choice of motor technology is influenced by factors such as cost, efficiency, and supply chain considerations, with some manufacturers opting for rare-earth-free motors and others prioritizing performance and simplicity.
• The development of electric motors without rare earths is seen as a strategic move to reduce dependence on China, which dominates the global supply of rare earths.
• Some commenters question the novelty of Renault's approach, pointing out that similar technologies have existed for a long time, while others see it as a significant step towards more sustainable and independent automotive production.
• The discussion also touches on the topic of electric vehicle maintenance and repair costs, with some arguing that certain brands are more expensive to maintain than others, while others point out that proper care and maintenance can minimize these costs.
• The use of EESM motors is expected to become more widespread in the future, with potential applications in a range of electric vehicles and industries.