| 摘要 |
PURPOSE:To obtain an anisotropic ring polymer magnet which is small in size and lightweight as well as excellent in magnetic properties and make it possible to select the number of magnetized poles so as to obtain a multiplicity of poles, by radially orientating easily magnetizable axes. CONSTITUTION:An anisotropic ring polymer magnet 1 is made of a material obtained by kneading a magnetic material 2 with magnetic anisotropy and a polymer material 3. The easily magnetizable axes of the magnetic material 2 are radially orientated with the circle center as a starting point. An apparatus for manufacturing the magnet 1 has an outside member composed of a non-magnetic die 10, a material inlet outer wall die 11 and an outside die 12, and a central die 9 of a ferromagnetic material. A kneaded material charging space 13 is defined between the outside member and the central die 9. An electromagnetic coil 6 is wound on the intermediate part of the central die 9 through the outside member, to constitute a closed magnetic circuit by the outer wall die 11, a ferromagnetic block 14, the outside die 12 and the central die 9. A radial magnetic field is applied to the kneaded material while the material is transferred from an inlet 7 to a molded article outlet 8. |
