EHSA – Electro Hydro Static Actuator by ETA

  • Post category:ETA-Blog

EHSA – Electro Hydro Static Actuators are compact modules that integrate to Electric Servomotor, Hydraulic Pump, Hydraulic Actuator, a small reservoir and Hydraulic Circuitry Manifold. For actuator motion control, EHSA do not need the power dissipative Control valves and are therefore highly efficient.

In combination with a digital controller, they provide adequate control of Position & Force. They have been used in machines and in Airborne flying controls. Here we demonstrate their application to a friction welding machine with the system in Position & Force modes switching (on the fly), as demand. by the machine cycle.


  • Compact actuator for excitation
  • No power pack, reservoir, filter, servo valve
  • Oil quantity reduced from 250 Ltr. to just 2 Ltr.
  • Improved power efficiency
  • Heat and noise reduced considerably

Control Modes :

  • Position Control
  • Force Control
  • Switch Mode

Applications :

  • Actuators with Posn Force Control
  • Moulding Machines
  • Hexapods / Motion Simulators
  • Friction Welders