Electromagnetic actuation systems are key components in hydraulics. They ensure precise control and enable extremely fast response times. What types of electromagnetic actuation systems actually exist in hydraulics? And how exactly do they work in detail?

In this article, you will learn how electromagnetic actuation systems can effectively contribute to optimizing and increasing the performance of your hydraulic systems. Get to know the most important application possibilities here! Discover how you can operate your hydraulic systems much more efficiently, safely and reliably by choosing suitable systems!

What are electromagnetic actuation systems in hydraulics?

In general, electromagnetic actuation systems convert electrical signals into mechanical movements using an electromagnet. Electromagnetic actuation systems in hydraulics are used to control valves by precisely regulating or interrupting the fluid flow.

Unlike manual or purely mechanical actuators, these systems are automated and respond directly to electrical control signals. Manual solutions require manual operation. And mechanical systems are often controlled by hydraulic pressure or mechanical connections.

The decisive advantage of electromagnetic actuation systems lies in their extremely high precision, short response time and efficiency. Thanks to precise electrical actuation, electromagnetic actuation systems open and close valves in a matter of seconds, enabling particularly fast and precise processes. At the same time, they are energy-efficient as they only consume electricity when they are actually actuated. This reduces operating costs and significantly increases the overall performance and reliability of hydraulic systems.

What types of electromagnetic actuation systems are there in hydraulics?

In hydraulic technology, electromagnetic actuation systems can basically be divided into two categories:

• Systems for switching valves
• Systems for proportional valves

Both types essentially consist of:

• a pole tube (1)
• a movable armature (2)
• an electric coil (3)
• a fastening nut (4)

Nevertheless, they differ in their functionality and application.

The pole tube consists of two ferromagnetic parts that are connected by a non-magnetic ring. This has a significant influence on the lifting force characteristic of the system. ARGO-HYTOS relies on high-quality, soldered connections here.

The movable armature has an integrated longitudinal hole for volume compensation, which ensures optimum operation. For applications that require particularly smooth switching, the opening can also be fitted with a special shutter (soft-shift option).

The coil generates the magnetic field and determines the strength of the generated field through its winding of copper wire. Depending on the number of windings and current strength, the field is stronger or weaker, which influences the movement of the armature.

A nut is used to secure the valve, which can also be equipped with manual emergency actuation as an option. This ensures reliable operation in the event of a power failure.

The main differences between switching and proportional valves

Switching valves:

• Binary control (valve position only on/off)
• Fast response time
• Simple control (DC or AC)

Proportional valves:

• Stepless control (variable valve positions)
• Sensitive, precise control
• More complex electronics required
• Softshift option for reduced pressure peaks

How does an electromagnetic actuation system work?

The operating principle of electromagnetic actuation systems is based on electromagnetism. As soon as current flows through the coil, it generates a magnetic field. This is bundled by the pole tube and acts on the ferromagnetic armature.

The armature is attracted by the magnetic field and moves in the direction of the pole tube. This movement is transferred to the control piston in the valve, which then releases or blocks the flow of hydraulic oil.

The mode of operation varies between switching and proportional valves. Switching valves work with binary control and therefore only have two states: open or closed.

In contrast, proportional valves allow infinitely variable control of the valve positions. Integrated ramp functions allow pressure peaks to be avoided and the load to be reduced.

How do you choose the right electromagnetic actuation system for hydraulic applications?

To find the right electromagnetic actuation system for your hydraulic application, you should first consider three key factors:

• required pressure range
• required volume flow
• type of control

The pressure range and volume flow rate are decisive in determining which valve and therefore which electromagnetic actuation is technically suitable.

You should also pay attention to the following selection criteria:

• The reaction speed determines how quickly your system responds to commands.
• The lifting force influences the performance - especially with higher pressure requirements.
• The electronic control system also plays an important role. Make sure that the electronics used are optimally compatible with your control infrastructure.

The ARGO-HYTOS team of experts will be happy to assist you in selecting a system that exactly meets your requirements.

Precise control, maximum performance: optimize your hydraulics now!

Electromagnetic actuation systems enable maximum precision, efficient sequences and reliable processes in your hydraulic applications. By choosing the right electromagnetic system from ARGO-HYTOS, you benefit from short response times, improved energy efficiency and minimized maintenance requirements. This increases the productivity and reliability of your machines in the long term.

Would you like to find out more about which system is best suited to your individual requirements? Our experts will be happy to advise you personally. Get in touch with us today. Together we can optimize your hydraulic processes with tailor-made electromagnetic solutions from ARGO-HYTOS!