ナノコンポジット磁石-回転子鉄心一体型IPM小型モータ

概要

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Exchange-coupled nano-composite melt-spun powder is a nano-structured composite of soft and hard magnetic phases mutually coupled by exchange interaction at the grain boundaries. Its resource balance and resistance to oxidation are better than those of Nd_2Fe_<14>B stoichiometric composition melt-spun powder, because it contains a smaller proportion of rare-earth elements such as neodymium. In order to apply this powder to high-efficiency small IPM (interior permanent magnet) brushless motors, we developed a modified molding technique using the slip-flow mechanism, which allows high-density molding of nano-composite melt-spun powder exceeding 95 wt.%.This technique was used to develop a small IPM rotor by directly molding the melt-spun powder with a laminated steel core.IPM motors using the above-mentioned rotor were found to have adequate stability with respect to aging and reverse magnetic fields, as well as high efficiency.
2000-04-15