| 简介 |
There is provided a rotary electrical machine, comprising a permanent magnet including a sintered body. The sintered body has : a first region disposed inside the sintered body and containing at least one element selected from the group consisting of rare earth elements; a second region exposed on a surface of the sintered body and including an oxide of the element; and a third region disposed between the first and second regions and containing the element. A concentration of the element in the third region is lower than a concentration of the element in the first region. A thickness of the second region is not less than 50 micrometers nor more than 800 micrometers. The permanent magnet has a residual magnetization of 1.16 T or more, a coercive force Hcj on an M-H curve of 1000 kA/m or more, and a recoil magnetic permeability on a B-H curve of 1.1 or more. |
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