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Hybrid linear actuator
Haydon Kerk Motion Solutions offers a unique line of hybrid stepper motor linear actuators that open new avenues for equipment designers who require high performance and exceptional endurance in a very small package. These high-performance hybrid actuators directly drive a rotor drive nut on a stainless steel precision acme lead screw. This patented interface reduces tolerances and noise while increasing efficiency and durability over v-thread and bronze nut configuration commonly used in other linear actuators. Actuators are available in captive, non-captive and external linear configurations.
Series | Travel / Step (Micron) | Max Force (Range) (N) | Stroke (mm) | Body Dimension (Size mm) | |
Captive | Non-Captive | ||||
External Linear | |||||
Size 8 | 1.5 - 40 | 2 - 45 | 9.0 - 38.1 | < 200 | 21 mm |
Size 11 | 3 - 50 | 15 - 90 | 12.7 - 63.5 | < 250 | 28 mm |
Size 11 DS | 3 - 50 | 30 - 133 | 12.7 - 63.5 | < 250 | 28 mm |
Size 14 | 1.5 - 50 | 50 - 220 | 12.7 - 63.5 | < 300 | 35 mm |
Size 14 DS | 15.8 - 127 | 50 - 220 | 12.7 - 63.5 | < 300 | 35 mm |
Size 17 | 1.5 - 50 | 100 - 200 | 12.7 - 63.5 | < 400 | 43 mm |
Size 17 DS | 15.8 - 127 | 50 - 350 | 12.7 - 63.5 | < 400 | 43 mm |
Size 23 | 4 - 50 | 300 - 880 | 12.7 - 63.5 | < 500 | 57 mm |
Size 23 DS | 12.7 - 127 | 150 - 880 | 12.7 - 63.5 | < 500 | 57 mm |
Size 34 | 12.7 - 127 | 400 - 2200 | 12.7 - 63.5 | < 500 | 87 mm |

The captive actuators is designed for shorter strokes up to about 8cm. It has a threaded drive screw held mostly inside the motor body connected to a spline. It has a built-in anti-rotation through the use of a spline shaft that allows it to extend and retract as a unit with no requirements for additional anti-rotation. The basic design is least tolerant of system misalignment and is the most protective actuator style because it is self-contained. The captive has the longest basic body style.

It has a lead screw going through the motor and has no reasonable stroke limits but must be attached to an assembly that will not rotate. This will then allow the lead screw to extend and retract without rotating. The screw can travel freely in and out of the motor body. In certain setups the motor may serve as the drive and the nut in the assembly. The anti-rotation is by the attachment point and is commonly a cut or machined thread on the end of the screw. The non-captive is potentially the shortest overall length assembly.
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It has a rotating screw with an external drive nut that can be mounted to a carriage assembly. The screw is part of the rotor, so it rotates with respect to the motor body. Linear motion is created by the nut traversing back and forth on the lead screw as the lead screw turns. A common end feature of the screw is a bearing journal. External linear motors are most akin to motorized rails where the nut is replaced by a driven carriage assembly.
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