According to foreign media reports, Toyota developed the world's first heat-resistant motor, the new motor magnet used to reduce the amount of rare earth metal element - neodymium by half.
Neodymium magnets are used in high-output motors for electric vehicles, and the price of such rare earth magnets is usually very high. The new magnets significantly reduce the amount of helium used, allowing the new motor to withstand high temperatures.
The new magnet developed by Toyota does not use terbium (Tb) or dysprosium (Dy). The above two kinds of rare earth resources are the key materials for realizing the heat resistance of the motor, but the geopolitical risks of its origin are high geopolitical risks. Larger, the supply is not stable. Toyota replaced some of the bismuth with lanthanum (La) and cerium (cerium) because the prices of the first two rare earth elements are relatively cheaper, aiming to significantly reduce the cost of rare earth magnets for motors.
It plays a vital role in maintaining high coercivity and heat resistance. These properties are affected if only the amount of niobium is reduced and two new rare earth substitutes are used.
To this end, Toyota has adopted a new technology that suppresses the deterioration of coercivity and heat resistance. In addition, Toyota has developed a new magnet to ensure its heat resistance is consistent with earlier performance.
Based on the earlier design, Toyota will reduce the amount of magnetic grain by 10% and use a double-layer high-performance grain surface to maintain its coercivity at high temperatures. In conventional neodymium magnets, helium is uniformly diffused into the magnet particles. In many cases, the amount of antimony used exceeds the actual demand and is intended to maintain coercivity. Toyota has increased the radon concentration on the surface of the magnet particles while also reducing the concentration in the grain core, thus significantly reducing the total amount of niobium.
It is estimated that magnets will be used in electric vehicle motors, generators, electric steering devices, robots, and various home appliances. Toyota's research results will help reduce the amount of rare earth elements, thereby reducing the risk of disruption of supply of rare earth resources and soaring prices. It is said that this motor product will be mass-produced in 2020-2025 and will be used in electric vehicles in the next ten years.
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