Selection of appropriate electro-hydraulic valves and components depends upon the specific application and its system configuration. Type of fluid, force and pressure requirements, valve response, and other factors will affect system operation. For instance, seal compatibility must be considered with fluid type due to the temperature range of the operation and its subsequent viscosity effects. Additionally, lower lifecycle costs and higher output can be achieved with an understanding of the differences between electro-hydraulic power and traditional electromechanical devices. Precise control and smooth motion of large force applications call for fluid power, so the proper selection and sizing of hydraulic system components can lead to distinct advantages over traditional electric applications.
Electro-hydraulic Versus Electric Motors
Rotational motion can be handled adequately by electric motors. Cheaper and easier to control than hydraulics, conventional electric motors are suitable for linear force applications, quick direction changes, and light loads with few axes. Electro-hydraulic actuators, controls, and valves offer several advantages, however.
Electro-hydraulic controls are capable of moving and lifting heavy loads at slow speeds without the braking or gearing required in electric motors. They also produce less heat and consume less space than electric motors, in many cases. Concerning sizing, electro-hydraulics are sized by their average loads, whereas electrics must be sized by their maximum loads. For these reasons, electro-hydraulic pumps are of benefit with varying loads and directions, while the electric version make more sense in non-varying load situations with continuous motion, such as applications involving conveyor belts.
Electro-hydraulic controls may be located remotely, allowing weight and noise to be non-issues in applications which may concern them. The non-hydraulic motors, on the other hand, are typically located directly on the motion axis or in close proximity. The controls also have the advantage of holding constant pressure without the application of additional energy. Driving electric motors, in comparison, to apply constant torque can result in overheating. As in most things mechanical, understanding system requirements and limitations can be the key to unlocking many inherent benefits.
Electro-hydraulic Advantages
The choice of drive for power sources offers electro-hydraulic system designers many options. Key applications for industry can benefit from electro-hydraulic automation and control. Tuning tools and software are widely available to optimize throughput quickly and efficiently, in order to deliver increased production, longer machine life, and improved quality over many applications currently handled by electric motors.
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