Innovation in Motion

While Hydraulic Cylinder Systems (HC) are a well-established motion control solution, Kyntronics’ innovative EHA (Electro-Hydraulic Actuation) technology provides a simpler, smaller, more reliable, and more cost-effective alternative

Central Hydraulic Cylinder Systems

Hydraulic Tubes FittingsAn HC system design requires a number of considerations and tradeoffs to provide precise motion control. Components typically include:

  • Pumps
  • Cylinders
  • Accumulators
  • Plumbing (hoses are most common, solid piping is more durable)
  • Servo control valves
  • Filters
  • Conduit and mounting brackets
  • Pressure transducers or other control additions for position and force control, often wired to a central PLC or computer system

The HC system demands significant time to plan due to the multiple elements needed. HC project planning includes developing a detailed bill of materials and selecting the proper space/mountings for all components providing for position/force control, hose/wire routings and other supporting infrastructure. The HC pump and motor typically are over-sized, running continuously wasting energy and creating unwanted noise. The system requires a considerable amount of hydraulic fluid to be maintained. The hydraulic liquid often will have leaks at the connections. Aside from leaking being an environmental hazard, this issue makes it susceptible to fluid contamination that is detrimental to a hydraulic system.

Electro-Hydraulic Actuator Systems

electro hydraulic actuator3The EHA is a drop-in self-contained solution. After simple mounting and connecting the wires, the EHA system is ready to start producing. The EHA's efficient method of converting power leads to a smaller, cost-effective package. The savings in costs and space are significant compared to a Central Hydraulic System. Compared to the continuous operation of the HC system, the EHA only runs when commanded, providing savings on energy and noise.

The advantages of the EHA include:

  • Compact and self-contained
  • Only runs when needed
  • EHAs do not leak
  • Quiet and smooth
  • Uses standard mounting configurations, and is wired and ready for use in hours without a long installation time or extensive planning
  • Self-contained units can be connected to popular network protocols including Ethernet and CANBus

EHAs use a self-contained design that is simple to set up and is very reliable. No external hoses or hydraulic infrastructure is required. The Kyntronics EHA design prevents fluid escape, making it industrially rugged and suitable for clean environments.

Get more information about our SMART Hydraulic Actuator products.

Move up to 20,000 pounds (90kN) of linear force while positioning to 0.001 inches (0.03mm) all in a compact package

More Force with Less Space

more force less space graph force feedback

On-board Pressure Sensor Provides Force Feedback

Exponential force with small increases in cylinder size.
e.g. from 2.5" to 3" (20% inc) the force increases (44%)

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HC vs EHA Technology Comparison
  EHAHydraulic Cylinder
High Energy Efficiency X  
Compact – High Force Density X X
Quiet X  
Modular Design – Scalable X X
Flexible Integration X  
Brushless Servo Control - Precise & Repeatable X  
Holds position without a brake X X
Integral force feedback X X
Environmentally tough X X
Versatile input voltages X  
Network Integration (CAN, Ethernet, etc.) X  
Stand-Alone Package X  

Article by , December 2016

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