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Linear Solenoid Selection Guidelines |
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Product comparison and links to datasheets |
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The low profile shape, besides contributing to smaller size, optimizes the magnetic flux paths for maximum force versus stroke characteristics. The construction of the plunger assembly provides an auxiliary flux path which permits a significant increase in force. The low profile solenoid construction not only provides long life, but also provides a rugged design for both military and commercial applications. |
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Flat Face: Higher efficiency for shorter strokes |
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Conical Face: Higher force for longer strokes |
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Applications |
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The reliability and high performance of Low Profile solenoids make them an ideal choice for applications in which consistent, reliable operation is critical. |
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- Pumps
- Machine tools
- Packaging machines
- Cranes
- Instruments
- Flow controls
- Trucks and buses
- Computer peripherals
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Linear Solenoid Principle of Operation |
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The low profile solenoid operates on the closing airgap principle. This actuator derives its name from its relatively low profile, or height from the mounting surface, thus having a limited stroke.
When power is applied through the coil, the resulting magnetic field attracts the ferrous portion of the armature assembly, creating one of the highest output forces (per input watt) of any solenoid available on the market.
This device is used to push a load, when attaching the load to the shaft extension protruding from the mounting surface. It can also be used to pull a load when that load is attached to the armature-end shaft extension, thus its reference as a push-pull solenoid. |
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Linear Solenoid Conical Face vs. Flat Face Plunger Design |
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Conical-faced designs extend the useful range of a solenoid to provide higher forces for strokes typically over 0.060 " (1.5 mm). The pole surface area is greater and the distance between the tapered cone faces is approximately one-half that of the gap between the land faces (for 30° angles), providing the effect of a closer air gap.
While some of the force component is lost because the force vector is not parallel with the plunger motion, the shorter gap and higher flux density combine to provide more output force for longer strokes.
For shorter strokes, the magnetic flux density increases and causes the iron to saturate rapidly as the poles move closer, thus reducing the efficiency of the conical-faced design. At this point, the flat-faced plunger is more efficient.
The main advantage of the flat-faced pole over the conical is that the full component of force is usable because the force vector is parallel with the pole motion. |
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Why Low Profile Linear Solenoids provide such high force and rapid response. |
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A key to the efficiency and compact form factor of the low profile solenoid is our special precision coil-winding process. With maximum copper packed into the allowable space, each solenoid develops tremendous force for its size and power input. The low profile form, in addition to contributing to smaller size, permits maximum pole face surface area for the magnetic flux.
Another factor that contributes to high efficiency is the additional iron surface on the external portion of the plunger; it provides an auxiliary flux path and a significant increase in force.
The force is also affected by other interrelated features, such as the length of the iron path, the magnetic saturation properties of the solenoid case and plunger, and the area and shape of the pole pieces.
The enclosed construction of the solenoid not only provides an iron path with minimum losses at the ring gap, but also provides a rugged design for critical environment application |
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