| 摘要 |
A permanent magnet device comprises a permanent magnet member (1), for example in the shape of a flat thin annular disc, and two reinforcing caps (2, 3) of spring steel of a very small thickness, stuck to the disc and welded by their edges to each other. The resulting device appears to be practically unbreakable as well as protected against corrosion and possible other detrimental effects of the environment, in particular when used as a rotor in an electric motor.
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