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Eddy Current Separators (view source)
Revision as of 02:35, 20 December 2011
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An '''Eddy Current Seperator'' is a conveyor system with a rapidly revolving magnetic rotor which generates an induction field through magnet poles. The rotational speed generates a rapidly changing magnetic field. In non-ferrous electrically conductive metal particles (non-ferrous metals) a magnetic Eddy Current will be generated. Through this interplay of forces, the non-ferrous particle will be shot from the product flow. | |||
The number of magnetic poles and the rotational will greatly affect the separation efficiency. There are magnetic rotors availible with 12 or 44 magnetic poles. The 12-pole rotors are used in coarse fractions from 70 mm. The 44-pole magnetic rotors are used in fine- or medium fractions. The rotation speed plays a major role. In fine fractions (0-20 mm), the machines can run 4000 rpm and be effective in the separation of small non-ferrous metal particles from about 2 mm. | |||
==Concentric Eddy Current separators== | |||
For this type, the magnetic rotor is mounted in the middle of the revolving drum. This results in a large separation angle which is desirable for some product types. This type of separator can easily be used in product flows that are almost or entirely free of iron and only contain non-ferrous metals. | |||
==Eccentric Eddy Current separators== | |||
For this type of Eddy Current separators, the magnetic rotor is mounted from the middle of the revolving drum. This allows the removal time of the metal particle to be affected, which may be desireable in some cases. Separation of non-ferrous metals from a material flow that still contains iron particles will not yield any problems for this machine. | |||