论文部分内容阅读
电磁铁种类较多,常以U型多见。它的磁轭多由相对磁导率μ_r高,B_s大,并且B_r和H_c小的纯铁制成,为磁轭磁阻小,要求它的横截面积尽可能大。其极轴多为优良性能软铁制作,它的一对极头常用纯铁材料制成(较为理想的材料是含钴50％的铁钴合金)。在制作时电磁铁的磁化线圈分成两个相同的部分,便分别套在两个极轴上,并尽可能靠近极头,线圈中还装有冷却系统,以提高导线能允许的电流密度。常用的极头形状一般有圆柱形和圆锥形两种,圆柱形极头能在较大范围内产生均匀
More types of electromagnets, often more common U-shaped. Its yoke and more by the relative permeability μ_r high, B_s big, and small B_r and H_c made of pure iron, magnetic yoke magnetic resistance is small, requiring its cross-sectional area as large as possible. Most of its polar axis for the performance of soft iron production, it is often a pair of polar pure iron material (the more ideal material is 50% cobalt-iron alloy). In the production of electromagnet magnetization coil is divided into two identical parts, respectively, set in the two polar axis, and as close as possible to the polar head, the coil is also equipped with a cooling system to increase the wire can allow the current density. Commonly used tip shape generally cylindrical and conical two, cylindrical tip can produce a wide range of uniform