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US07948135B2 Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor 有权
径向各向异性烧结磁体及其制造方法，使用烧结磁体的磁体转子和使用磁体转子的电动机

Radial anisotropic sintered magnet and its production method, magnet rotor using sintered magnet, and motor using magnet rotor
摘要：
A radial anisotropic sintered magnet formed into a cylindrical shape includes a portion oriented in directions tilted at an angle of 30° or more from radial directions, the portion being contained in the magnet at a volume ratio in a range of 2% or more and 50% or less, and a portion oriented in radial directions or in directions tilted at an angle less than 30° from radial directions, the portion being the rest of the total volume of the magnet. The radial anisotropic sintered magnet has excellent magnet characteristics without occurrence of cracks in the steps of sintering and cooling for aging, even if the magnet has a shape of a small ratio between an inner diameter and an outer diameter.
摘要（中）：

形成为圆筒状的径向各向异性烧结磁体包括从径向倾斜30°以上的方向取向的部分，磁体中的部分以2％以上的体积比容纳在50％以上 ％以下的部分，以及沿径向方向或以与径向小于30°的角度倾斜的方向的部分，该部分是磁体总体积的其余部分。 径向各向异性烧结磁体即使磁体具有内径和外径之间的小比例的形状，也具有优异的磁体特性，而不会在老化烧结和冷却步骤中产生裂纹。

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