Device description
Page 17
Eddy current principle
The separation process of the NF separator is based on the so called “Eddy current principle”. If
conductive materials are subjected to a very fast alternating magnetic field, a current will be generated.
These currents are called
Eddy currents
. These currents generate a magnetic field, opposite to the
alternating magnetic field of the magnet roller (the source magnet). The electro conductive particles that
are being fed over such a magnet roller are therefore ejected by the alternating magnetic field.
Drawing:
Eddy current principle
•
The non-electro conductive materials fall down straight after they have passed the magnet roller.
•
The separated non-ferro parts and the clean product flow are prevented from re-assembling by
means of separation plate(s).
•
Once separated they can be transported or collected.
•
The separation result can be improved by changing belt speed and/or rotational speed of the
magnet roller.
The belt speed of the NF separator and the vibration frequency of the vibration feeder can be
adjusted by the control box unit.
Magnet roller
Ejected non-ferro metal particles
Inert product, with non-ferro
metals removed
Mixed product
Separation plate
