Electromagnetic spreading magnets0 pages

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ThyssenKrupp Magnettechnik

Electromagnetic spreading magnets

In case of electromagnetic spreaders
the magnetic flux is not generated by
permanent magnets, but by coils
(solenoids). Depending on the
arrangement (two- pole or three- pole)
two or three coils are applied. The kind
of operation is the same as with
permanent magnetic spreaders,
however with some restrictions to be
explained below.

Iron plate

Iron pole
Sheet

Typical arrangement of a conventional, electromagnetic spreader

It has to be stated first that the spreading effect is not the same from the lower edge to the
upper edge of the spreading magnet, because the end windings of the coils cause a thinning
of the lines of electric field strength and thus a reduced magnetic flux. This becomes
noticeable by a reduced spreading performance at the lower and upper ends of the system.
In order to compensate this effect as far as possible, a iron strip is attached to the magnetic
pole surrounded by the coil; this strip exceeds the end windings and extends the lines of
magnetic flux to the lower edge of the system.
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