Central Hydraulic Cylinder Systems
An HC system design requires a number of considerations and tradeoffs to provide precise motion control. Components typically include:
- Plumbing (hoses are most common, solid piping is more durable)
- Servo control valves
- 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
The 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.
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
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%)
|High Energy Efficiency||X|
|Compact – High Force Density||X||X|
|Modular Design – Scalable||X||X|
|Brushless Servo Control - Precise & Repeatable||X|
|Holds position without a brake||X||X|
|Integral force feedback||X||X|
|Versatile input voltages||X|
|Network Integration (CAN, Ethernet, etc.)||X|
Article by Carl Richter, December 2016