What is an Electro-Hydraulic Actuator?

• Hydraulic Actuation
o https://www.valin.com/resources/video...

• System Components for Hydraulics
o Which components aren’t needed for an electro-hydraulic system?
Hydraulic Power Units (HPUs), hoses, and fittings
Valving, accumulators, and regulators

• Electro-Hydraulic actuator designs
o Servo motor with a closed system containing the liquid controlled by a pump
o Still includes a reservoir to hold liquid that is used to move the actuator

• How do we maintain fluid in an Electro-Hydraulic actuator?
o No maintenance required
o No vents so can be used in any orientation
o Sealed so never exposed to air, therefore never oxidizes
o Since not being constantly circulated, don’t get the shear damage that is typical

• Feedbacks and dual-loop feedback architectures
o Encoder feedback from the servo motor doesn’t correlate to precision actuator motion
o Feedback from the actuator allows for more precise motion
o Can even use tertiary feedback
o Types of feedback used at the actuator
Position
Pressure internally
Force

• Flexibility in design
o Lack of mechanical tie between the motor and actuator provides more flexibility
o Allows for many different angles and combinations for the motor/actuator combination

• Pros of Electro-Hydraulic actuators
o Flexibility
o Minimal fluid vs Hydraulics
Ounces vs Gallons of fluid
o Advantages of Hydraulics
o Advantages of Electric

• Cons of Electro-Hydraulic actuators
o Dual-loop feedback
This also provides more capability and control
o Package size at the actuator location

See more at https://www.TheMotionControlShow.com and reach out to us there.

If you have any questions or are just looking for some help, we're happy to discuss your application with you. Reach out to us at (855) 737-4716 or visit https://www.valin.com