CPC H01F 7/206 (2013.01) [B66C 1/04 (2013.01); B66C 1/06 (2013.01); H01F 7/13 (2013.01); H01F 7/18 (2013.01)] | 19 Claims |
1. A lifting-magnet attachment magnetic pole unit for a lifting magnet used to lift and convey a steel material with magnetic force, the lifting-magnet attachment magnetic pole unit comprising:
a first split magnetic pole in contact with an iron core of the lifting magnet, the first split magnetic pole having a branched structure; and
a second split magnetic pole in contact with a yoke of the lifting magnet, the second split magnetic pole having a branched structure,
wherein the first and second split magnetic poles are alternately arranged, and
wherein the first split magnetic pole has dimensions satisfying Inequality (1):
S×B<L×t×BS Inequality (1)
where
S is a cross-sectional area (mm2) of an inner pole of the lifting magnet;
B is a mean magnetic flux density (T) inside the inner pole of the lifting magnet;
L is a total perimeter (mm) of the first split magnetic pole in a region where the first split magnetic pole is in contact with a lifted steel material;
t is a plate thickness (mm) of the lifted steel material; and
BS is a saturation magnetic flux density (T) in the lifted steel material.
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