| 摘要 |
A solenoid includes a pole member of a magnetic material, the pole member including a pole end portion having a pole surface, an armature adapted for movement relative to the pole member between first and second positions and a coil assembly for positioning the armature relative to the pole member. A magnetic shunt structure, which is located adjacent to a pole surface of the pole member, includes at least one magnetic shunt member of a magnetically permeable material, bridging at least a portion of the air gap between the pole face and the armature face, when the armature is spaced apart from the pole member, to provide a low reluctance magnetic flux path between the pole member and the armature, increasing the attractive force between the armature and the pole member. The shunt member can be configured as a ring, as a washer, or as a combination of both a ring and a washer. |
