| 摘要 |
PROBLEM TO BE SOLVED: To increase the magnetic intensity on the sleeve surface of the main magnetic pole of a permanent magnet member and, at the same time, to reduce the size of the member, by heating and kneading a mixture of a specific ferrite material and a thermoplastic integrity resin material, extrusionmolding the kneaded mixture in a cylindrical body while the mixture is oriented in a magnetic field, and then, sintering the molded body. SOLUTION: A permanent magnet member having radial anisotropy is composed of a ferrite material which is obtained by extrusion-molding magnetic power and sintering the molded body and has a basic ingredient expressed by (A1-xRx)O.n[(Fe1-yMy)O3] (at.%) (where, A, R, and M respectively represent Sr and/or Ba, at least one kind of rare-earth element including Y, and at least one kind of element selected out of Co, Mn, Ni, and Zn and x, y, and n respectively represent numerals respectively meeting relations, 0.01<=x<=0.04, [x/(2.6 n)]<=y<=[x/(1.6n)], and 5<=n<=6). Therefore, the magnetic flux density on the sleeve surface of the main pole of the magnet member can be increased to >=1,000 G when the distance between the surface of the magnet member and sleeve surface is reduced. |
