| 摘要 |
A solenoid operable from an alternating voltage source is disclosed and the solenoid may actuate a fluid valve with the fluid of the valve wetting the movable armature inside a barrel. The barrel is sealed against fluid leakage at all places except the axial end connected to the valve. A frame is coaxial with the barrel and encloses an electrical coil. A magnetically permeable core is inside the barrel and fixed relative to the frame and this core carries a first pole piece. A second pole piece is on the movable armature for cooperation with the first pole piece. The electrical coil is energized with rectified voltage from the alternating voltage source and this together with the shape of the pole pieces establishes a controlledsaturation of these pole pieces in a range of positions of the armature. This saturation of the pole pieces is established so that the saturation decreases as the armature moves from a first extended position toward a second closed position. This changeable saturation of the pole pieces permits the stroke versus force curve of the solenoid to be improved in comparison to the prior art.
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