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在永久磁铁及其磁路设计中,工作点的选择十分重要。本文作者采用长方形锶铁氧体,其磁能积(BH)_(max)=(3.1～3.3)×10~6高斯·奥斯特,对不同长宽比例、不同矫顽力通过实验给出工作点 B_d=f(L/S~(1/S)),以及退磁因子 N=f(L/S~(1/S),a/b)曲线,并通过计算给出各种曲线回归方程式。磁通密度在磁铁中的分布以及在磁铁表面上数值的计算是基本磁路设计,文中采用三种形式进行计算。“日”字型磁系可较大幅度提高永磁磁选设备磁场强度。在总结各种因素对背景场强影响的实验基础上,提出一种较简单的计算方法。文中计算误差基本在10％以内。
In the permanent magnet and its magnetic circuit design, the choice of operating point is very important. In this paper, the authors use rectangular strontium ferrite, whose energy product (BH) _ (max) = (3.1 ~ 3.3) × 10 ~ 6 Gauss Oster, work out experimentally for different aspect ratio and different coercive force Point B_d = f (L / S ~ (1 / S)), and the demagnetization factor N = f (L / S ~ (1 / S), a / b) curve. The distribution of the magnetic flux density in the magnet and the calculation of the numerical value on the surface of the magnet are the basic magnetic circuit designs. Three forms are used in the article. “Day” shaped magnetic system can greatly improve the magnetic field strength of permanent magnetic separation equipment. Based on the experiment of summing up the influence of various factors on the background field strength, a simple calculation method is proposed. The calculation error is basically less than 10%.