Rare Earth Permanent Magnet Motor
In the national “13th Five-Year” key R & D plan for new energy vehicle drive motors, Cai Wei, a well-known motor expert, HS Magnetic Materials Co., Ltd. to develop dripping technology and lattice refinement technology to integrate rare earth permanent magnet motors. The use of medium and heavy rare earths was reduced by up to 50%.
Permanent magnet motors account for nearly 90% of global new energy vehicle electric drives. Among them, permanent magnets added with heavy rare earths such as ytterbium and dysprosium have high magnetic energy products and high coercive force. The corresponding rare earth permanent magnet motors have a series of advantages such as small size, lightweight, high efficiency, good characteristics and are highly respected. However, due to the low reserves of heavy rare earths in rare earth mines, with the popularization of new energy electric vehicles, the large-scale production of rare earth permanent magnet motors at home and abroad, the use of heavy rare earths will face a shortage of resources. At present, some developed countries have used low-weight rare earth permanent magnets in motor products.
However, the preparation of rare-earth permanent magnets and permanent magnet motors in China have long been subject to Japan. Cai Wei introduced, “In the past, Japan bought China’s rare earth permanent magnet raw materials, made them into permanent magnets and even motors, and then sold them to us or exported them to Europe and the United States at high prices.” However, the dripping technology and the lattice refinement technology broke the calm of related technologies. That is to avoid a shortage of rare earth resources and reduce costs.
“In the past, heavy rare earths such as dysprosium or thorium were often kneaded together with other permanent magnet raw materials like kneading noodles. Now by refining the lattice, heavy rare earths are infiltrated into the magnet. “Accurate.” Cai Wei said, the researchers used grain size refinement and microstructure consistency technology to fill the gap in domestic fine powder technology, mass production of 35EH magnets, the content of radon, from 7wt% -8wt% to 5wt% , Reduce the use of heavy rare earth by more than 20%. At the same time, they combined the fine powder process with the diffusion process. The content of scandium in 42EH magnets was reduced from 8 wt% to 4.5% equivalent scandium, and the amount of heavy rare earth was reduced by 40% -50%.
Rare earth is an important strategic reserve resource. Rare earth permanent magnet motors are widely used in various fields such as aviation, aerospace, national defense, equipment manufacturing, industrial and agricultural production, and daily life. The white paper “State and Policy of China’s Rare Earths” has pointed out that China has supplied more than 90% of the world’s market supply with 23% of rare earth resources.
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