IEC TR 63304:2021(E)描述了使用超导磁体(SCM)在开路磁路中测量永磁材料的DC磁性的方法的一般原理和技术细节。 该方法适用于永磁材料，例如IEC 60404-8-1中规定的那些，其性质被假定在其整个体积中是均匀的。 有两种方法: -SCM-振动样品磁力计(VSM)方法； -SCM提取方法。 该文件还描述了校正试样中的自退磁场对在开路磁路中测量的退磁曲线的影响的方法。根据校正的退磁曲线确定磁性。 笔记？这些SCM方法可以确定矫顽力高于2mA/m的永磁材料的磁性能。对于矫顽力高于1.6 mA/m的磁性材料，IEC 60404-5中规定的闭合磁路中的测量方法可能由于磁轭极片中的饱和效应而导致显著的测量误差（参见IEC 60404-5）。

IEC TR 63304:2021(E) describes the general principle and technical details of the methods of measurement of the DC magnetic properties of permanent magnet materials in an open magnetic circuit using a superconducting magnet (SCM).
This method is applicable to permanent magnet materials, such as those specified in IEC 60404-8-1, the properties of which are presumed homogeneous throughout their volume.
There are two methods:
– the SCM-Vibrating Sample Magnetometer (VSM) method;
– the SCM-Extraction method.
This document also describes methods to correct the influence of the self-demagnetizing field in the test specimen on the demagnetization curve measured in an open magnetic circuit. The magnetic properties are determined from the corrected demagnetization curve.
NOTE？These SCM-methods can determine the magnetic properties of permanent magnet materials with coercivity higher than 2 MA/m. The methods of measurement in a closed magnetic circuit specified in IEC 60404-5 can lead to significant measurement error due to saturation effects in the pole pieces of yoke for the magnetic materials with coercivity higher than 1,6 MA/m (see IEC 60404-5).