External Hybrid Linear Actuator

The 28000 series (Size 11) double-stack external hybrid linear actuator, featuring a rotating Acme stainless steel lead screw incorporated into the motor's rotor, means shaft-to-lead screw couplers are not needed with this design. Haydon's external linear actuator replaces four different components – a motor, coupler, lead screw and nut.

The nut on the external linear actuator uses the same high-performance engineering thermoplastics as the rotor drive nut of Haydon's non-captive and captive designs. This feature ensures trouble free, exceptional long life operation for use in high-precision applications. The double stack external hybrid linear actuator is available in a wide variety of resolutions ranging from 0.000125" (0.003175mm) per step, to 0.002" (0.0508mm) per step, and delivers thrusts of up to 30 lb (133N) without compromising long life or cost. A standard external linear has 4" of visible lead screw; however, lead screw length and termination, as well as external nut design, can be customized to fit application requirements.

In this design, the lead screw is an integral part of the motor with a mating nut translating along the screw. As the motor steps, the lead screw rotates but does not advance. This is the best overall design approach for obtaining linear travel in confined spaces. The lead screw ends can be machined to allow the use of out-board bearing support for long lead screw lengths.