Episode# 68: What is an Electro-Hydraulic Actuator?

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The Motion Control Show

What is an Electro-Hydraulic Actuator?
  • Hydraulic Actuation
  • System Components for Hydraulics
    • Which components aren’t needed for an electro-hydraulic system?
  • Electro-Hydraulic actuator designs
    • Servo motor with a closed system containing the liquid controlled by a pump
    • Still includes a reservoir to hold liquid that is used to move the actuator
  • How do we maintain fluid in an Electro-Hydraulic actuator?
    • No maintenance required
    • No vents so can be used in any orientation
    • Sealed so never exposed to air, therefore never oxidizes
    • Since not being constantly circulated, don’t get the shear damage that is typical
  • Feedbacks and dual-loop feedback architectures
    • Encoder feedback from the servo motor doesn’t correlate to precision actuator motion
    • Feedback from the actuator allows for more precise motion
    • Can even use tertiary feedback
    • Types of feedback used at the actuator
      • Position
      • Pressure internally
      • Force
  • Flexibility in design
    • Lack of mechanical tie between the motor and actuator provides more flexibility
    • Allows for many different angles and combinations for the motor/actuator combination
  • Pros of Electro-Hydraulic actuators
    • Flexibility
    • Minimal fluid vs Hydraulics
      • Ounces vs Gallons of fluid
    • Advantages of Hydraulics
    • Advantages of Electric
  • Cons of Electro-Hydraulic actuators
    • Dual-loop feedback
      • This also provides more capability and control
    • Package size at the actuator location

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