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表征永磁材料磁特性的特征参量是剩磁,矫顽力和最大磁能积,特征量的测定是通过测量退磁曲线而获得,测量退磁曲线最基本的方法是感应法。本文主要讨论如何用感应法准确测量退磁曲线,从而确定材料的特征参量。一、饱和磁化场的选取由于永磁有高的矫顽力,要饱和磁化,一般要求磁化场达到材料内禀矫顽力的三到五倍,并要求它的保持时间足以克服由于涡流引起的滞后。我国标准规定:当磁场增加50％时,试样磁化强度的变化不大于1％,则认为试样已达到饱和磁化。表1给出了常见各类永磁材
The characteristic parameters that characterize the magnetic properties of permanent magnet materials are remanence, coercivity and maximum energy product. The determination of the characteristic quantities is obtained by measuring the demagnetization curve. The most basic method for measuring the demagnetization curve is the induction method. This article focuses on how to accurately measure the demagnetization curve using the induction method to determine the characteristic parameters of the material. First, the choice of saturated magnetization Since the permanent magnet has a high coercivity, to saturation magnetization, the general requirements of the magnetization field material to achieve three to five times the intrinsic coercivity, and its retention time required to overcome the eddy current caused by Lag China’s standard states: when the magnetic field increased by 50%, the sample magnetization change of not more than 1%, then that the sample has reached saturation magnetization. Table 1 shows the common types of permanent magnets