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| Solenoids in Applications with Long Linear Travel (0.625 " or greater) |
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The force produced by a conventional linear solenoid is inversely proportional to the square of the air gap, long linear strokes become impractical. As the travel distance becomes greater, the starting force is reduced logarithmically (function of the square). Because of this fact, it does not require a very long stroke to reduce a solenoid's starting force to a very small amount.
Although there are ways of using multiplying linkages to increase the stroke of linear solenoids, the usage of a lever arm, the cord of the arc principle, and a rotary solenoid is a very reliable and practical way to obtain long linear strokes. The air gaps for rotary solenoids are generally very small (0.025 to 0.100" depending on the stroke and size of the solenoid chosen.) This means that you can obtain a reasonable starting force for long strokes. For instance, a rotary solenoid with 45 degrees of rotation and a 1" long lever arm will provide a linear motion of approximately 0.75". With a 2" lever arm, the linear motion would be approximately 1.5".
The linear travel (cord of the arc) for a rotary solenoid can be calculated as follows:
Linear travel (cord of arc) = 0.017 x (length of lever arm) x degrees of stroke. |
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