| 摘要 |
<p>A compound magnet comprising a carrier ring (2) which defines a plurality of magnet receiving segments (9) within which permanent magnets (10) are located in side by side and end to end abutting relationship. The magnets (10) are magnetised in a direction of magnetisation B extending parallel to their abutting sides (14) and perpendicular to their ends (15). The magnets (10) are arranged in the segments (9) with the directions of magnetisation B of the permanent magnets (10) parallel to each other, and form a direction of magnetisation C of the segments (9) which in turn is parallel to direction of magnetisation B of the magnets (10). The direction of magnetisation C of the segments (9) is such as to generate a uni-directional concentrated magnetic field A which extends diametrically across and through the centre of the carrier ring (2).</p> |
