使用超导磁体在开放磁路中测量永磁（硬磁）材料磁性的方法

[中文适用范围]： 本技术报告描述了使用超导磁体（SCM）在开路磁路中测量永磁材料直流磁性能的一般原理和技术细节。该方法适用于如IEC 60404-8-1中规定的永磁材料，其特性假设在整个体积内是均匀的。适用的具体方法包括：SCM振动样品磁强计（VSM）方法和SCM提样法。本文件还描述了校正开路磁路测量的磁化曲线中试样自退磁场影响的方法，磁性能是根据校正后的磁化曲线确定的。 [外文原描述]： 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).