菱形磁介质参数对磁场特性的影响

为考察菱形磁介质表面的磁场特性随其顶角α的变化趋势，采用ANSYS软件模拟了不同顶角角度下的菱形磁介质在不同背景磁感应强度下的磁场特性。结果表明：背景磁感应强度为0.2 T时，菱形聚磁介质表面产生的磁场强度、磁场梯度和磁场力均随α的增加而降低；背景磁感应强度大于0.2 T时，菱形磁介质表面产生的磁场强度、磁场梯度和磁场力均随α的增加呈先提高后降低的趋势，并且在达到极值前随α的增加缓慢提高，达到极值后随α的增加快速降低。磁介质顶角α增加使得介质有效迎磁面积增大，这有利于提高介质的聚磁能力，表现为磁场强度、磁场梯度和磁场力的提高，但有效迎磁面积太大会使磁力线分布更为分散，导致磁场强度、磁场梯度和磁场力的降低。在低背景磁感应强度下，聚磁能力始终小于分散磁场力的作用，表现为磁场强度、磁场梯度、磁场力随介质顶角的增加先缓慢下降后快速下降；在高背景磁场强度下，α小于某角度时，聚磁作用大于分散磁场力作用，α大于这个角度时，聚磁作用小于分散磁场力作用，表现为磁场强度、磁场梯度、磁场力随介质顶角的增加先缓慢提高后快速下降。

Influence of the Parameter of Diamond Magnetic Medium on Magnetic Field Property

In order to investigate the magnetic properties variation tendency of the diamond magnetic media with the change of the vertex angle,ANSYS software is used to simulate the magnetic field characteristics at different diamond vertex an-gle and various background magnetic field strength. The results show that when background magnetic field strength is 0. 2T,the magnetic field intensity,magnetic field gradient and magnetic field force reduce with the increase ofαangle. When background magnetic field strength is more than 0. 2 T,magnetic field intensity,magnetic field gradient and magnetic field force present tendency of first increase and then reduce with the increase ofαangle. In addition,whenαangle is less the extrema,the mag-netic field intensity,magnetic field gradient and magnetic field force increase slowly,whenαis more than the extrema,decrease rapidly. With the increase ofαangle,the effective magnetic flux area will increase. This is helpful to improve medium magnet-ism gathering ability. The relative result is the increase of the magnetic field intensity,magnetic field gradient and magnetic field force,while the effective magnetic flux area is too big,magnetic line of force distribution will be more scattered,result in the reduce of the magnetic field intensity,magnetic field gradient and magnetic field force. With low background magnetic in-duction intensity,the magnetism gathering ability is always less than the effect of dispersion force,magnetic field intensity,mag-netic field gradient and magnetic field force slowly decline and then rapidly decline;With high background magnetic field in-tensity,alpha is smaller than a certain angle,disperse magnetic effect is greater than the assembled magnetic force,and when alpha is bigger than a certain angle,disperse magnetic effect is smaller than the assembled magnetic force,greater than this an-gle,the assembled magnetic effect is less than the magnetic force,magnetic field intensity,magnetic field gradient and magnetic field force slowly increase when alpha is smaller than a certain angle,and falling fast when alpha is bigger than a certain angle.