Development of a Multimagnetic Property Member for Permanent Magnet Motor

xA one-piece permanent magnet rotor, made with bonded Nd-Fe-B magnet and soft magnetic powder core, was successfully fabricated. By pressing these different powders in the same cavity, it is expected that the mechanical tolerance can be very accurate and that the bonding strength can be very strong. Furthermore, because the magnet and the iron yoke are bonded to be as one component in a series of process, various shape of magnet segment can be obtained, not like the previous designs such as rectangle or simple arc segment. For the bonded magnets, both isotropic and anisotropic bonded magnet can be used. When oriented bonded magnet with Br=0.9 T was used, we could get magnetic flux comparable to that with sintered Nd-Fe-B, when properly designed