Anisotropic soft magnetic article and method for its production

摘要

An article 2, or a method of making an article, comprises a polycrystalline soft magnetic material including grains with a common preferred orientation and a magnetic anisotropy. The said article 2 is arranged such that it has a coercive field strength of less than 100 kA/m. The material may comprise REa(Fe, X)bZc polycrystalline microstructure where RE is one or more lanthenoid elements which includes at least one RE2(Fe, X)14Z phase, X is optional and if present may be one or more of Co, Ti, V, Mo, Nb, Zr, Mn, Ni, Al, Cr, Ga, Si, Ge, In, Sn and Cu and Z is B and/or C. The coercive field strength of the material may be less than 10 kA/m. When the article is in use a difference in magnetic energy of ΔE between a mag­netic energy El in a first, easy magnetisation, direction 10 and a magnetic energy E2 in a second, more difficult magnetisation, direction 11 is at least 150 to 270 kJ/m3. The method may provide powder particles forming crystal grains which are oriented within a polymer matrix and sintered and processed to form a preferred texture soft magnetic anisotropic material. The magnetic material may have axial, planar or conical anisotropic properties. The article 2 or method may be used in forming a reluctance motor 1 rotor arrangement.