Abstract
Exchange-coupled nano-composite melt-spun powder is a nano-structured composite of soft magnetic phases and hard magnetic phases mutually coupled by exchange interaction at the grain boundaries. Its resource balance and oxidizability are better than those of Nd2Fe14B stoichiometric composition melt-spun powder, because it contains a smaller proportion of rare-earth elements such as neodymium.
A permanent magnet rotor (SPM: surface permanent magnet /IPM: interior permanent magnet) was developed by directly molding this melt-spun powder with a laminated steel core, and a possible application was found to high-efficiency IPM motors, which use properties to peculiar the nano-composite melt-spun powder.
