| 摘要 |
A solenoid is provided that is energizable by an electric current and includes a pole piece, which is configured from a magnetizable pole matepal, an armature, which is movable when an electric current is passed through the solenoid, and an electromagnetic coil. A current passes through the coil when the solenoid is energized, the coil includes a central opening, wherein the pole piece is at least partially located The diameter of the central opening may be less in a mid region than at upper and lower ends of the coil. At least one of either the upper or lower inside ends of the central opening of the coil may be beveled or contoured with a radius. The magnetic flux generated when the coil is energized has an enhanced flow path reducing the saturation in the transitional area of the central opening as compared to a standard coil.
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