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Soft Shift® Series Linear Solenoids |
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Product comparison and links to datasheets |
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Soft Shift Linear Solenoids have a unique construction which allows easy transition from snap action to variable position.
Using the same power, starting force is three to five times higher than standard solenoids at the fully de-energized position. This is advantageous for starting inertial loads or detented mechanisms, and for conserving electrical power.
In snap action applications, typical solenoids move to the end of the stroke within milliseconds, with a characteristic increase in ending force and acceleration. With the Soft Shift Linear Solenoid plunger, however, velocity can be controlled by ramping the input current for slow, noiseless operation. For applications where variable positioning is desired, closed loop control can be accomplished by adding electronic controls. This gives accurate, repeatable action.
The essentially horizontal force curves prevent rapid acceleration at the end of the stroke, avoiding the excessive wear, noise and vibration that characterize standard solenoids. A Soft Shift Linear Solenoid can be a low-cost alternative to a linear stepping motor with a lead screw for up to and including a 0.420" (10.7 mm) stroke. |
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Principle of Operation - Linear Solenoids |
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The Soft Shift Linear Solenoid is a constant airgap, linear solenoid. It has a stator similar to a rotary or low profile soleniod, with a completely enclosed armature. A shaft is pressed through the center of the armature and functions as the armature support. This shaft extends out from both sides of the solenoid and is used as the load interface. If a pull function is desired, the load should be attached to the armature-end shaft extension. Conversely, for a push motion, the load should be attached to the base-end shaft extension. Also, the built-in return spring offers an added convenience for the designer.
A very unique and versatile device, it can be used in a traditional "snap-action" mode by simply applying power to move the designer's load. The internal return spring automatically returns the solenoid to the de-energized position when power is removed.
In addition, it can be used in applications where the designer wishes to control the speed that their load moves, when both energizing and de-energizing. As the coil is energized, the armature is pulled into the magnetic filed. In a no load situation, the more current applied, the farther the armature moves. The faster that this current is applied, the faster the armature responds. |
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Overview of Linear Solenoid Technology |
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Applications - Linear Solenoids |
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Applications for the Soft Shift Linear Solenoid include office machinery such as typewriters and copiers; medical equipment; keypad testing; locking devices; motion control; hot water solar controllers; robotics; air dampers; optical shutter equipment; and a variety of other industrial applications as well as military uses.
Our catalog versions are typically designed to utilize the maximum possible stroke capability for each size. Also, the force curves are essentially horizontal. This permits use in applications where quiet operation is a primary concern or where the load to be moved is sensitive to vibration or shock.
The medical fluid analyzer pictured is a good example. The tubes through which fluids are flowing cannot withstand great shock. Excessive shock could cause breakage of the tubes which could then cause a leak of an infectious fluid, for example.
Soft Shift solenoids also contain cushion washers to aid quiet, shock-free operation. In addition, voltage can be applied slowly to take advantage of a slow energizing capability. The de-energizing part of the cycle is also controllable.
A Soft Shift Linear Solenoid is also a good choice for long life applications in that its two bearings de-sensitize the unit to side loading. The closed construction also keeps out contaminants, which makes it ideal for rugged applications such as paper mills. |
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| Metric Soft Shift Selection Overview |
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Package
Dimensions (mm)
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Force (N) @ Maximum Stroke
and Specified Duty Cycle
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Size
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Dia. |
Length |
Maximum
Stroke
(mm)
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100%
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50%
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25%
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10%
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2EPM
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28.6
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25.3
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4.1
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4.45
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6.23
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8.9
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16.91
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3EPM
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33.3
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31.9
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6.4
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4.45
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8.46
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10.24
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19.14
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4EPM
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39.7
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37.4
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7.6
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8.90
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13.35
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19.14
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33.38
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5EPM
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47.6
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49.1
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10.2
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13.35
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20.02
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31.15
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55.62
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6EPM
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57.2
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56.2
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10.7
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31.15
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42.72
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71.20
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131.28
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| All data is at 20oC coil temperature. Force outputs degrade with elevated temperatures. |
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| Imperial Soft Shift Selection Overview |
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Package
Dimensions (in)
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Force (lbs) @ Maximum Stroke
and Specified Duty Cycle
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Size
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Dia. |
Length |
Maximum
Stroke in
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50%
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2EP
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1.125
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0.996
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0.16
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1.0
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1.4
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2.0
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3.8
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3EP
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1.312
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1.232
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0.25
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1.0
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1.9
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2.3
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4.3
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4EP
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1.562
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1.471
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0.30
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2.0
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3.0
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4.3
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7.5
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5EP
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1.875
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1.935
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0.40
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3.0
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4.5
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7.0
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12.5
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6EP
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2.250
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2.214
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0.42
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7.0
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9.6
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16.0
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29.5
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| All data is at 20oC coil temperature. Force outputs degrade with elevated temperatures. |
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File Format Help
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ZIP: Some files need to be unzipped. Unzip utilities available for download for Windows / Macintosh.
For technical difficulties with this page contact us here.
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L303
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