| 摘要 |
An electromagnet is provided comprising a fixed yoke, a movable armature including a core concentric with an energization coil, and magnetizable plates separated from the yoke by a variable longitudinal air-gap, a return means providing the rest position of the armature, and a compensation device comprising a thin U shaped stirrup piece whose two legs cooperate with the ends of the plate, portions of this stirrup cooperate with inclined ramps of an adjustable rotary cam, placed concentrically with the core of the armature.
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