| 摘要 |
<p>Permanent magnets (12) are used to perform useful work. The field of a first permanent magnet (12) is diverted by electromagnetic coils (22, 24) to such a low value that another opposing permanent magnet (20, 26, 52) can approach the first magnet (12) without the application of undue force. The field in the first magnet (12) is restored to act on the second magnet so as to repel it. The force which results may be harnessed to effect reciprocal or rotary motion.</p> |
