RADIAL ANISOTROPIC SINTERED MAGNET AND ITS PRODUCTION METHOD, MAGNET ROTOR, AND MOTOR

摘要

PURPOSE: A radial anisotropic sintered magnet and its production method, a magnet rotor, and a motor are provided to prevent occurrence of cracks at the time of sintering and cooling for aging even if the magnet has a shape of small ratio between an inner diameter and an outer diameter. CONSTITUTION: A radial anisotropic sintered magnet formed into a cylindrical shape, comprises 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.