Abstract
Hydraulic linear actuators dominate in high power applications but are much less common in low power (<100 W) systems. One reason for this is the cost: electric actuators in this power range generally exhibit lower performance but are also much less expensive than hydraulic systems. However, in recent years, some miniature hydraulic components have been mass produced, driving down prices. This paper presents the application of these low-cost components, together with a novel very low-cost 3D-printed valve to create an electrohydrostatic actuator. Capable of very high power and force density, this system is competitive on cost with lower-performing electric actuators. This paper presents models for the system’s performance, as well as experimental validation data.
Highlights
IntroductionFluid power (or hydraulic) systems are well known for their high power density and force density, with respect to both mass and volume
Fluid power systems are well known for their high power density and force density, with respect to both mass and volume
Combined with robustness and reliability, this has led to hydraulic systems dominating in high-power (10–1000 kW) linear actuator applications such as construction, forestry, and mining equipment
Summary
Fluid power (or hydraulic) systems are well known for their high power density and force density, with respect to both mass and volume. While this is true when considering the entire system, it is especially true when considering the size of the final actuator. There have been few examples of hydraulic power transfer in low-power applications (1–100 W), and what does exist are high-cost systems (e.g., for aerospace). In this power range, linear motion is typically achieved by electrically driven screw actuators. A typical actuator (Actuonix L16-56-35-12-P [1]) has a maximum power rating of 0.8 W (50 N at 16 mm/s), weighs 56 g, and costs USD 80 plus shipping
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