| 摘要 |
A linear solenoid device includes a stator defining a cylindrical stator opening, and a pair of axially spaced cylindrical stator pole surfaces. An armature is mounted within the stator opening for movement parallel to the stator pole surfaces. The armature defines a pair of armature pole surfaces which overlap the stator pole surfaces by varying areas as the armature is moved. Annular air gaps are defined between the stator pole surfaces and the armature and the armature has mounted thereon a pair of cylindrical radially polarized permanent magnets, each such magnet being adjacent one of the armature pole surfaces. When a stator coil is energized, movement of the armature results from the varying reluctance across the air gaps as the armature pole surfaces overlap varying areas of the stator pole surfaces and, also, from repulsion of the permanent magnets. As a consequence, higher force outputs are attainable.
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