Magnetic Form of Heavy Rare-Earth Free Motor for Hybrid Electric Vehicle

Paper #:
  • 2017-01-1221

Published:
  • 2017-03-28
Abstract:
There have been calls for the automotive industry to reduce CO2 emissions in consideration of the impact on the global environment, and increasing efforts are being made to develop electric vehicles. Heavy rare earth - iron - boron magnets (neodymium magnets) have the largest maximum energy product (BH)max among current magnets, and are used in the driving motors of hybrid electric vehicles and electric vehicles. However, these operating environments have high temperatures and strong diamagnetic fields, so magnets need high heat resistance, or high coercive force (Hcj). To support this need, heavy rare earth elements (Dy, Tb) with high anisotropic magnetic fields are added to increase Hcj. However, deposits of these elements are unevenly distributed around the world and the ratio of heavy rare earth elements in ores is one tenth or less that of light rare earth elements. Therefore, it is necessary to reduce the amount of heavy rare earth elements used, based on the risk and cost of these scarce resources. In order to design a hybrid electric vehicle motor that uses heavy rare earth free magnets while still maintaining performance equal to that of a conventional motor, it is necessary to establish a method of recovering the reduction in coercive force. This research developed a new motor that uses heavy rare earth free hot-deformed magnets and is capable of replacing the driving motor mounted in a one-motor hybrid system that is optimal for the compact car class. This research enabled the development of the first hybrid electric vehicle motor known to date, and the developed motor was mounted in a one-motor hybrid system and launched onto the market.
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