| 摘要 |
An electromagnetic actuator has two permanent magnets arranged along their polar axes, with the proximal poles having same polarity. An electromagnet surrounds the two permanent magnets and, when energized, overrides the repulsion between the proximal poles and moves one permanent magnet toward the other fixed magnet. Should the electromagnet fail, the actuator reverts to the unactuated position without need of a spring, gravity and so forth.
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