| 摘要 |
A linear electromagnetic actuator comprising a stator energised by at least one electrical coil (4, 29), two oppositely moving parts (2, 3 or 22, 23) and at least one thin permanent magnet (1 or 20, 21) magnetised through its thickness. The stator has two cylindrical stator poles (5, 8 or 24, 25) between which the cylindrical coil (4, 29) is fitted, and the moving parts (2, 3 or 22, 23) are ferromagnetic parts arranged in such a way that they define air gaps having a variable cross-section together with the cylindrical stator poles (5, 8 or 24, 25). The sum of the cross-sections of the two air gaps formed at a front end of the actuator is constant.
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