烧结钕铁硼饱和磁化行为研究

Study on Saturation Magnetization Behavior of Sintered NdFeB

为了明确烧结钕铁硼磁体在磁中性和具有磁化历史状态下所需最低饱和磁化场强度与其内秉矫顽力或饱和磁极化强度的关系,选取了三种烧结钕铁硼磁体,在磁中性和有磁化历史两种初始状态下,分别在不同大小的磁场强度下对磁体进行充磁,得出了开磁路下的磁偶极矩和闭磁路下的退磁曲线。结果表明:对于磁中性状态磁体,只需要Hs=2Js/μ0的磁化场就可以将磁体饱和磁化;对于有磁化历史的磁体,则需要Hs=3Js/μ0的磁化场才能实现饱和磁化。

To clarify the relationship between the minimum saturation magnetization field strength required for sintered NdFeB magnets and their intrinsic coercivity or saturation polarization in the initial state of magnetic neutrality and magnetized history,three different grades of sintered NdFeB magnets were selected in different initial states.The magnetic dipole moments and the demagnetization curves were measured after magnetizing under different magnetic field strengths.The results show that for sintered NdFeB magnets,only a magnetization field of Hs=2Js/μ0 is required to saturate the magnets in the state of magnetic neutrality.For magnets with magnetized history,a magnetization field of Hs=3Js/μ0 is required to realize saturation magnetization.