Preparation method of rare earth bonded magnets with continuously controlled anisotropy directions

An advanced preparation method was carried out to obtain a highly dense radially anisotropic rare earth bonded magnet with continuously controlled anisotropy directions. An 8-pole/12-slot surface permanent magnet synchronous motor with a rotor 40.9mm in outer diameter, which comprised the above-mentioned magnet, was prepared, and it was found that the cogging torque decreases by approximately 20% and the back emf increases by 134% compared with those of a conventional isotropic Nd2Fe14B one with the same dimensions.