磁化状态对粘结NdFeB磁体磁稳定性影响分析

Analysis of the magnetization status to the magnetic stability of bonded NdFeB magnet

粘结NdFeB磁体的磁化状态不仅直接决定磁体对外提供的磁场大小,也对磁体的磁稳定性、材料用量有重要影响。通过对不同磁化状态反向退磁一定时间后磁通密度变化率的分析可知,饱和磁化后反向退磁的磁体具有更优的磁稳定性。反向退磁幅度越大,磁体在气隙中磁通密度受外界退磁场导致的损失率越小,磁性能越稳定。反向退磁幅度大于9%时,磁体具有相对较好的磁稳定性;同时,材料用量越多的磁体磁稳定性越好。

For bonded NdFeB magnets,the magnetization status not only directly determines the magnitude of the magnetic field provided by the magnet,but also has an important impact on the magnetic stability and material consumption of the magnet. Based on the analysis of flux density variation after saturated magnetization for a certain time,it is found that the magnet with reverse demagnetization after saturated magnetization has better magnetic stability. The larger the range of the reverse demagnetization is,the smaller the loss rate of flux density in air gap caused by external demagnetization field is,and the better the stability of magnetic performance is. And the result of the experiment shows that when the range of the reverse demagnetization is greater than 9%,the magnet has relatively good magnetic stability;and it is verified that the more the material is used,the better the magnetic stability of the magnet is.