| 摘要 |
A permanent magnet (5, 11, 13) having a magnetic body made of a permanent magnetic material has a magnetic north and a magnetic south, wherein said magnetic body has a first pole surface (14) and a second pole surface on opposite ends having a lateral surface between them and a sheath (6, 7, 10, 12) made of a ferromagnetic material, which encloses the magnetic body with the exception of a subarea in the area of said first pole surface.
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