SINTERED MAGNET MOTOR

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PROBLEM TO BE SOLVED : To provide a sintered magnet motor which reduces the amount of use of a fluorine compound. SOLUTION : The sintered magnet motor has a sintered magnet rotor, which contains an ferromagnetic material whose main component to be sintered is iron, a fluorine compound or an acid-fluorine compound formed inside crystal grains or on part of grain boundaries of the ferromagnetic material, and at least one of an alkaline element, alkaline earth element, and a rare earth element in such a way that part of the fluorine compound or acid-fluorine compound is distributed with a concentration gradient from the surface to the inside of the ferromagnetic material and the rare earth element is distributed with a concentration gradient between the grain boundary surface and the host phase of the ferromagnetic material. The concentration distribution of the fluorine compound is asymmetric with respect to the magnetic pole center of the sintered magnet rotor. COPYRIGHT : (C)2010, JPO&INPIT