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Dings eddy current separators use powerful rare earth magnets for recovering non ferrous metals from recyclables, plastics, glass, material processed at composting or waste-to-energy facilities, automotive shredder residue, and other processed material or minerals. Eddy current array (ECA) is a nondestructive testing technology that provides the ability to electronically drive multiple eddy current coils, which are placed side by side in the same probe assembly. Complex shapes can be inspected using probes customized to the profile of the part being inspected. Over the years, probe technology and data processing have advanced to the point where eddy current testing is recognized as being fast, simple, and accurate. The phenomenon of eddy currents was discovered by French physicist Léon Foucault in 1851, and for this reason eddy currents are sometimes called Foucault currents. Foucault built a device that used a copper disk moving in a strong magnetic field to show that eddy currents (magnetic fields) are generated when a material moves within an applied magnetic field. Eddy current testing began largely as a result of the English scientist Michael Faraday's discovery of electromagnetic induction in 1831. In 1879, another breakthrough was made when another English scientist, David Hughes, demonstrated how the properties of a coil change when placed in contact with metals of different conductivity and permeability. Beginning in 1933, in Germany, while working for the Kaiser-Wilhelm-Institute, Professor Friedrich Förster adapted eddy current technology to industrial use, developing instruments for measuring conductivity and for sorting mixed-up ferrous components. EC-Works originates from the oldest branch roots in Germany and is specialised in the NDT-services business.
Various materials could be checked, like carbon steel, stainless steel, duplex, alloy or other conductive materials.
Compared to single-channel eddy current technology, eddy current array technology provides the following benefits: Drastically reduces inspection time. Many SolidWorks users especially the ones who are dealing with conductors are interested to find a way to predict the level of the electric current induced in the conductors by the variation of the magnetic fields.
Eddy currents are electric currents induced within conductors by a changing magnetic field in the conductor.



The term eddy current comes from analogous currents seen in water when dragging an oar breadthwise: localized areas of turbulence known as eddies give rise to persistent vertices.
In the following picture the eddy current density in a three-phase transformer is depicted which is coming from the AC analysis of this transformer using the AC magnetic solver of our 3D Electromechanical simulation software, EMS. Each individual eddy current coil in the probe produces a signal relative to the phase and amplitude of the structure below it. Eddy currents are fields of alternating magnetic current that are created when an alternating electric current is passed through one or more coils in a probe assembly. The technology is now widely used in the aerospace, automotive, petrochemical, and power generation industries for the detection of surface or near-surface defects in materials such as aluminum, stainless steel, copper, titanium, brass, Inconel®, and even carbon steel (surface defects only). Faraday discovered that when a magnetic field passes through a conductor (a material in which electrons move easily)-or when a conductor passes through a magnetic field-an electric current will flow through the conductor if there is a closed path through which the current can circulate.
However, it was not until the Second World War that these developments in the transmitting and receiving of electromagnetic waves were put to practical use for materials testing.
In 1948, Förster founded his own company in Reutlingen, a business based on eddy current testing that continues to this day. EC-Works, the company's name tells it quite shortly, operates eddy current inspections and develops new technologies and applications. The two coils (red) were pulled over the defect and the typical signal appeared on the screen.
Special probes allow to detect inside cracks from outside, depending on the material and wall thickness.
Somewhat analogously, eddy currents can take time to build up and can persist for very short times in conductors due to their inductance.Eddy currents in conductors of non-zero resistance generate heat as well as electromagnetic forces. The latter can be used for non-destructive testing of materials for geometry features, like micro-cracks.
This data is referenced to an encoded position and time and represented graphically as a C-scan image.


When the probe is linked with the part under inspection, the alternating magnetic field induces eddy currents in the test part.
The expert knowledge and practical experience of more than 35 years eddy-current services enables them to their unique position in the international NDT-market.
If a defect appears in the effective area, the eddy current have to take a different way, this changes the impedance of the coil and the operator see the changes on his screen (Z1-Z2). A similar effect is the proximity effect, which is caused by externally-induced eddy currents.
Most conventional eddy current flaw detection techniques can be reproduced with ECA inspections; however, the remarkable advantages of ECA technology allow improved inspection capabilities and significant time savings. Discontinuities or property variations in the test part change the flow of the eddy current and are detected by the probe in order to make material thickness measurements or to detect defects such as cracks and corrosion.
Many advances were made throughout the 1950s and 1960s, especially in the aircraft and nuclear industries.
Our electromechanical full wave 3D simulation software, EMS,  has an Finite element solver particularly for conduction analysis which characterizes the eddy current in conductors. The electromagnetic forces can be used for levitation, creating movement, or to give a strong braking effect. There have been many recent developments in eddy current testing, leading to improved performance and the development of new applications. Eddy current testing is now a widely used and well-understood inspection technique for flaw detection as well as for thickness and conductivity measurements. In this application, they are minimized with thin plates, by lamination of conductors or other details of conductor shape.




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