| 简介 |
A rotating machine is equipped with a sintered magnet. The sintered magnet includes : a ferromagnetic material consisting mainly of iron; a layer of a fluoride compound or a layer of an oxyfluoride compound formed inside crystal grains or in a portion of grain boundary area of the ferromagnetic material; at least one element selected from the group consisting of alkalis, alkaline earth elements, and rare earth elements and carbon contained in the layer of the fluoride compound or the layer of the oxyfluoride compound; and a continuously extending layer formed by a portion of the layer of the fluoride compound or the layer of the oxyfluoride layer, the continuously extending layer extending from a surface of the ferromagnetic material through the inside of the ferromagnetic material to an opposite side surface of the ferromagnetic material. A ratio of an average concentration of fluorine in an area within 100 μm from the surface of the ferromagnetic material to an average concentration of fluorine in an area including a central part at a distance of at least 100 μm is in the range of 1±0.5, and a concentration gradient of the rare earth elements is present in a matrix near the grain boundary of the ferromagnetic material. |
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