Working principle of eddy current separator

The core principle of an eddy current separator (taking an eddy current separator used for non-ferrous metal separation as an example) is to utilize the induced current (eddy current) generated in a conductor in a high-frequency alternating magnetic field. A high-speed rotating magnetic roller generates an alternating magnetic field. When non-ferrous metals (such as aluminum and copper) pass through this magnetic field, eddy currents are induced inside. These eddy currents generate a repulsive force opposite to the original magnetic field, causing the metal to be ejected and separated from the non-conductive material.

Working process of eddy current separator

1. Material Entry: The mixed materials (usually crushed) are fed into the rotating magnetic roller area via a conveyor belt.
2. Magnetic Field Induction: The internal magnetic rollers (usually rare-earth permanent magnets) rotate at high speed, creating a high-frequency alternating magnetic field at the end of the conveyor belt.
3. Eddy Current Generation: When non-ferrous metal materials enter the high-speed rotating magnetic field, induced eddy currents are generated inside the metal due to changes in magnetic flux.
4. Repulsive Separation: This eddy current generates a magnetic field opposite in direction to the original magnetic field. The strong magnetic repulsive force generated by this opposite magnetic field propels the non-ferrous metals (such as aluminum, copper, zinc, etc.) forward, causing them to pass the separating plate and fall into the non-ferrous metal zone.
5. Non-metallic Fall: Non-conductive materials (such as plastics, glass, wood, stainless steel, etc.) do not generate eddy currents and are less affected by magnetic forces. They fall directly due to gravity or along a shorter trajectory to another area, thus achieving the separation of metals and non-metals.

Advantages of eddy currents

1.Non-contact and high efficiency

2.High sensitivity and accuracy

3.Universality and wide application

4.Strong sorting capability (environmentally friendly and energy-saving)

5.Adapt to complex environments

Technical parameter of eddy current separator

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