Since March 1, 2010 our headquarter is located in Essen.
From 26.-30. October 2010 ThyssenKrupp Magnettechnik is represented at the world's largest sheet metal working exhibition.
Please visit our stand E22 in exhibition hall 16!
Operating time
In order to be capable of comparing the performances of permanent-
magnetic and electromagnetic spreaders it is compulsory to
take the operating time of the electromagnetic spreader into
account, for its spreading performance is especially dependent
on the max. admissible housing temperature (e.g. 70 °C).
The higher the temperature may be, the more heat can be radiated
by natural convection (not considering additional forced cooling
for reasons of costs). With copper varnished wire used for
the coil the latter itself is not in danger, because it can
stand temperatures of up to 140 °C; this does not apply
to persons which might come into contact with the housing
either accidentally or for reasons of operation. If the OT
can be reduced, the density of current can be increased which
increases the spreading performance. If the electrical spreader
is to have an OT of 100 %, it can be stated at once that a
permanent- magnetic spreader has a considerably higher spreading
performance with dimensions being the same. Both types can
be compared with an OT of approx. 20 % to 25 %. With the OT
being 50 % the permanentmagnetic spreader shows advantages.
Before coming to a decision in favour of one or the other
type parameters apart from the spreading performance should
be considered as well, because a lower spreading performance
might sensibly be compensated by a further spreading magnet.
If e.g. spreading magnets are only attached to one side of
the sheet bundle (due to design), a higher spreading performance
can normally not be noticed, because it is compensated by
the increased attractive force, which means that the spreading
height is not increased owing to friction.
