Toyota’s New Electric Motor Magnet Uses Less Rare Earths
Accordingly, the newly developed magnet from Japanese carmaker Toyota requires neither Terbium (Tb) nor Dysprosium (Dy). Both these rare earths are scarce, expensive and mined in geopolitically unstable regions. However, Toyota was also able to reduce the need for neodymium (Nd) by replacing almost half of it with the inexpensive rare earths lanthanum (La) and cerium (Ce).
Despite the lower proportion of neodymium, a magnet with comparable heat resistance and coercivity has reportedly been created by using the correct ratio of materials. In the first half of the 2020s, the resource-efficient magnet could be used in motors for electrical power steering, while its use in motors for electric vehicles could still take about ten years.