Patent ID: 11875940
Assignee: JFE STEEL CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 0:
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.