3种环形拼接磁系磁场特性的Magnet仿真分析

针对现有永磁辊式磁选机存在的漏磁严重、磁场强度低等突出问题，提出了3种环形拼接磁系--轭铁锥尖环形拼接磁系（YC）、轭铁圆面环形拼接磁系（YR）和无轭铁环形拼接磁系（NY），并采用Magnet软件仿真研究了它们的磁场特性。结果显示，3种磁系的近表面周向磁场强度极大值、近表面周向磁场梯度、径向磁场强度初始最大值和径向磁场作用力初始最大值均按YC→YR→NY的顺序递减，而径向磁场强度的作用深度和径向磁场作用力的作用深度则分别按YR→NY→YC和YR→YC→NY的顺序递减，从而反映出轭铁可有效聚磁，减轻漏磁现象，其中具锥尖结构的轭铁聚磁效果更为显著但影响磁场作用深度。根据仿真结果，可知YR的综合磁场特性最佳，YC其次，NY第3。

Simulation Analysis of Three Annular Splicing Magnetic System Based on Magnet

In view of the existing serious problems in current permanent magnetic roll magnetic separator, such as magnetic flux leakage, low magnetic field intensity etc, three new types of permanent magnetic roll magnetic system structure of Yoke-Cone(YC), Yoke-Round(YR), and Non-Yoke(NY) are proposed.And their magnetic field properties are simulated by Magnet software.The results showed that: the max value of circumferential magnetic field intensity and magnetic field gradient intensity around the roll surface, the max initial value of radial magnetic field intensity and magnetic field force decrease as the YC→YR→NY subsequence; The working depth value of radial magnetic field intensity decreases as YR→NY→YC subsequence, while that of radial magnetic field force decreases as YR→YC→NY subsequence.It shows that yoke can greatly improve the magnetism gathering and weaken magnetic flux leakage.Yoke-cone has a more significant effect on magnetism gathering, but its working depth is greatly reduced.The simulation results reflect that YR has best overall magnetic field characteristics, followed by YC and NY in order.